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Ethanol

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(Redirected from Pure alcohol)
For ethanol as a drug or medicine, see Alcohol (drug) and Alcohols (medicine).
Not to be confused with Ethenol or Ethynol.

Ethanol
Full structural formula of ethanol
Full structural formula of ethanol
Skeletal formula of ethanol
Skeletal formula of ethanol
Ball-and-stick model of ethanol
Ball-and-stick model of ethanol
Space-filling model of ethanol
Space-filling model of ethanol

Absolute ethanol
Names
Pronunciation /ˈɛθənɒl/
Preferred IUPAC name
Ethanol[1]
Other names
  • Absolute alcohol
  • Alcohol
  • Cologne spirit
  • Drinking alcohol
  • Ethylic alcohol
  • EtOH
  • Ethyl alcohol
  • Ethyl hydroxide
  • Ethylene hydrate
  • Ethylol
  • Grain alcohol
  • Hydroxyethane
  • Methylcarbinol
Identifiers
3D model (JSmol)
3DMet
1718733
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.000.526 Edit this at Wikidata
787
KEGG
UNII
UN number UN 1170
  • InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3 checkY
    Key: LFQSCWFLJHTTHZ-UHFFFAOYSA-N checkY
  • InChI=1/C2H6O/c1-2-3/h3H,2H2,1H3
    Key: LFQSCWFLJHTTHZ-UHFFFAOYAB
  • OCC
Properties
C2H6O
Molar mass 46.069 g·mol−1
Appearance Colourless liquid
Odor wine-like, pungent[2]
Density 0.78945 g/cm3 (at 20 °C)[3]
Melting point −114.14 ± 0.03[3] °C (−173.45 ± 0.05 °F; 159.01 ± 0.03 K)
Boiling point 78.23 ± 0.09[3] °C (172.81 ± 0.16 °F; 351.38 ± 0.09 K)
Miscible
log P −0.18
Vapor pressure 5.95 kPa (at 20 °C)
Acidity (pKa) 15.9 (H2O), 29.8 (DMSO)[4][5]
−33.60·10−6 cm3/mol
1.3611[3]
Viscosity 1.2 mPa·s (at 20 °C), 1.074 mPa·s (at 25 °C)[6]
1.69 D[7]
Hazards
GHS labelling:
GHS02: Flammable GHS07: Exclamation mark
Danger
H225, H319, H360D
P210, P233, P240, P241, P242, P305+P351+P338
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
3
0
Flash point 14 °C (Absolute)[9]
Lethal dose or concentration (LD, LC):
  • 7060 mg/kg (oral, rat)
  • 3450 mg/kg (mouse)
[12]
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 1000 ppm (1900 mg/m3)[10]
REL (Recommended)
 TWA 1000 ppm (1900 mg/m3)[10]
IDLH (Immediate danger)
 3300 ppm [11]
Safety data sheet (SDS) [8]
Related compounds
Related compounds
Supplementary data page
Ethanol (data page)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound with the chemical formula CH3CH2OH. It is an alcohol, with its formula also written as C2H5OH, C2H6O or EtOH, where Et stands for ethyl. Ethanol is a volatile, flammable, colorless liquid with a characteristic wine-like odor and pungent taste.[13][14] In nature, grape-sugar breaks up by the action of fermentation into alcohol or carbonic acid, without anything being added.[15] As a psychoactive depressant, it is the active ingredient in alcoholic beverages, and the second most consumed drug globally behind caffeine.[16]

Ethanol is naturally produced by the fermentation process of sugars by yeasts or via petrochemical processes such as ethylene hydration. Historically it was used as a general anesthetic, and has modern medical applications as an antiseptic, disinfectant, solvent for some medications, and antidote for methanol poisoning and ethylene glycol poisoning.[17][18] It is used as a chemical solvent and in the synthesis of organic compounds, and as a fuel source for lamps, stoves, and internal combustion engines. Ethanol also can be dehydrated to make ethylene, an important chemical feedstock. As of 2023, world production of ethanol fuel was 29,590,000,000 US gallons (112.0 gigalitres), coming mostly from the U.S. (51%) and Brazil (26%).[19]

Name

[edit]

Ethanol is the systematic name defined by the International Union of Pure and Applied Chemistry for a compound consisting of an alkyl group with two carbon atoms (prefix "eth-"), having a single bond between them (infix "-an-") and an attached −OH functional group (suffix "-ol").[20]

The "eth-" prefix and the qualifier "ethyl" in "ethyl alcohol" originally came from the name "ethyl" assigned in 1834 to the group C
2H
5− by Justus Liebig. He coined the word from the German name Aether of the compound C
2H
5−O−C
2H
5 (commonly called "ether" in English, more specifically called "diethyl ether").[21] According to the Oxford English Dictionary, Ethyl is a contraction of the Ancient Greek αἰθήρ (aithḗr, "upper air") and the Greek word ὕλη (hýlē, "wood, raw material", hence "matter, substance").[22] Ethanol was coined as a result of a resolution on naming alcohols and phenols that was adopted at the International Conference on Chemical Nomenclature that was held in April 1892 in Geneva, Switzerland.[23]

The term alcohol now refers to a wider class of substances in chemistry nomenclature, but in common parlance it remains the name of ethanol. It is a medieval loan from Arabic al-kuḥl, a powdered ore of antimony used since antiquity as a cosmetic, and retained that meaning in Middle Latin.[24] The use of 'alcohol' for ethanol (in full, "alcohol of wine") was first recorded in 1753. Before the late 18th century the term alcohol generally referred to any sublimated substance.[25]

Uses

[edit]

Medical

[edit]
Main article: Alcohol (medicine)

Ethanol is the oldest known sedative, used as an oral general anesthetic during surgery in ancient Mesopotamia and in medieval times.[17][18] Mild intoxication starts at a blood alcohol concentration of 0.03-0.05 % and induces anesthetic coma at 0.4%.[26] This use carries the high risk of deadly alcohol intoxication, pulmonary aspiration and vomiting, which led to use of alternatives in antiquity, such as opium and cannabis, and later diethyl ether, starting in the 1840s.[27]

Ethanol is used as an antiseptic in medical wipes and hand sanitizer gels for its bactericidal and anti-fungal effects.[28] Ethanol kills microorganisms by dissolving their membrane lipid bilayer and denaturing their proteins, and is effective against most bacteria, fungi and viruses. It is ineffective against bacterial spores, which can be treated with hydrogen peroxide.[29]

A solution of 70% ethanol is more effective than pure ethanol because ethanol relies on water molecules for optimal antimicrobial activity. Absolute ethanol may inactivate microbes without destroying them because the alcohol is unable to fully permeate the microbe's membrane.[30][31] Ethanol can also be used as a disinfectant and antiseptic by inducing cell dehydration through disruption of the osmotic balance across the cell membrane, causing water to leave the cell, leading to cell death.[32]

Ethanol may be administered as an antidote to ethylene glycol poisoning[33] and methanol poisoning.[34] It does so by acting as a competitive inhibitor against methanol and ethylene glycol for alcohol dehydrogenase (ADH).[35] Though it has more side effects, ethanol is less expensive and more readily available than fomepizole in the role.[36]

Ethanol is used to dissolve many water-insoluble medications and related compounds. Liquid preparations of pain medications, cough and cold medicines, and mouth washes, for example, may contain up to 25% ethanol[37] and may need to be avoided in individuals with adverse reactions to ethanol such as alcohol-induced respiratory reactions.[38] Ethanol is present mainly as an antimicrobial preservative in over 700 liquid preparations of medicine including acetaminophen, iron supplements, ranitidine, furosemide, mannitol, phenobarbital, trimethoprim/sulfamethoxazole and over-the-counter cough medicine.[39]

Some medicinal solutions of ethanol are also known as tinctures.

Pharmacological

[edit]

In mammals, ethanol is primarily metabolized in the liver and stomach by ADH enzymes.[40] These enzymes catalyze the oxidation of ethanol into acetaldehyde (ethanal):[41]

CH3CH2OH + NAD+ → CH3CHO + NADH + H+

When present in significant concentrations, this metabolism of ethanol is additionally aided by the cytochrome P450 enzyme CYP2E1 in humans, while trace amounts are also metabolized by catalase.[42] The resulting intermediate, acetaldehyde, is a known carcinogen, and poses significantly greater toxicity in humans than ethanol itself. Many of the symptoms typically associated with alcohol intoxication—as well as many of the health hazards typically associated with the long-term consumption of ethanol—can be attributed to acetaldehyde toxicity in humans.[43]

The subsequent oxidation of acetaldehyde into acetate is performed by aldehyde dehydrogenase (ALDH) enzymes. A mutation in the ALDH2 gene that encodes for an inactive or dysfunctional form of this enzyme affects roughly 50 % of east Asian populations, contributing to the characteristic alcohol flush reaction that can cause temporary reddening of the skin as well as a number of related, and often unpleasant, symptoms of acetaldehyde toxicity.[44] This mutation is typically accompanied by another mutation in the ADH enzyme ADH1B in roughly 80 % of east Asians, which improves the catalytic efficiency of converting ethanol into acetaldehyde.[44]

Energy source

[edit]
See also: Food vs. fuel
Main article: Ethanol fuel
Corn vs ethanol production in the United States
  Total corn production (bushels) (left)
  Corn used for Ethanol fuel (bushels) (left)
  Percent of corn used for Ethanol (right)
Energy content (lower heating value) of some fuels compared with ethanol.
Fuel type MJ/L MJ/kg Research
octane
number
Dry wood (20% moisture) ~19.5
Methanol 17.9 19.9 108.7[45]
Ethanol 21.2[46] 26.8[46] 108.6[45]
E85
(85% ethanol, 15% gasoline)		 25.2 33.2 105
Liquefied natural gas 25.3 ~55
Autogas (LPG)
(60% propane + 40% butane)		 26.8 50
Aviation gasoline
(high-octane gasoline, not jet fuel)		 33.5 46.8 100/130 (lean/rich)
Gasohol
(90% gasoline + 10% ethanol)		 33.7 47.1 93/94
Regular gasoline/petrol 34.8 44.4[47] min. 91
Premium gasoline/petrol max. 104
Diesel 38.6 45.4 25
Charcoal, extruded 50 23

The largest single use of ethanol is as an engine fuel and fuel additive. Brazil in particular relies heavily upon the use of ethanol as an engine fuel, due in part to its role as one of the world's leading producers of ethanol.[48][49] Gasoline sold in Brazil contains at least 25% anhydrous ethanol. Hydrous ethanol (about 95% ethanol and 5% water) can be used as fuel in more than 90% of new gasoline-fueled cars sold in the country.

The US and many other countries primarily use E10 (10% ethanol, sometimes known as gasohol) and E85 (85% ethanol) ethanol/gasoline mixtures. Over time, it is believed that a material portion of the ≈150-billion-US-gallon (570,000,000 m3) per year market for gasoline will begin to be replaced with fuel ethanol.[50]

USP grade ethanol for laboratory use

Australian law limits the use of pure ethanol from sugarcane waste to 10 % in automobiles. Older cars (and vintage cars designed to use a slower burning fuel) should have the engine valves upgraded or replaced.[51]

According to an industry advocacy group, ethanol as a fuel reduces harmful tailpipe emissions of carbon monoxide, particulate matter, oxides of nitrogen, and other ozone-forming pollutants.[52] Argonne National Laboratory analyzed greenhouse gas emissions of many different engine and fuel combinations, and found that biodiesel/petrodiesel blend (B20) showed a reduction of 8%, conventional E85 ethanol blend a reduction of 17% and cellulosic ethanol 64%, compared with pure gasoline.[53] Ethanol has a much greater research octane number (RON) than gasoline, meaning it is less prone to pre-ignition, allowing for better ignition advance which means more torque, and efficiency in addition to the lower carbon emissions.[54]

Ethanol combustion in an internal combustion engine yields many of the products of incomplete combustion produced by gasoline and significantly larger amounts of formaldehyde and related species such as acetaldehyde.[55] This leads to a significantly larger photochemical reactivity and more ground level ozone.[56] This data has been assembled into The Clean Fuels Report comparison of fuel emissions[57] and show that ethanol exhaust generates 2.14 times as much ozone as gasoline exhaust.[58] When this is added into the custom Localized Pollution Index of The Clean Fuels Report, the local pollution of ethanol (pollution that contributes to smog) is rated 1.7, where gasoline is 1.0 and higher numbers signify greater pollution.[59] The California Air Resources Board formalized this issue in 2008 by recognizing control standards for formaldehydes as an emissions control group, much like the conventional NOx and reactive organic gases (ROGs).[60]

More than 20% of Brazilian cars are able to use 100% ethanol as fuel, which includes ethanol-only engines and flex-fuel engines.[61] Flex-fuel engines in Brazil are able to work with all ethanol, all gasoline or any mixture of both. In the United States, flex-fuel vehicles can run on 0% to 85% ethanol (15% gasoline) since higher ethanol blends are not yet allowed or efficient. Brazil supports this fleet of ethanol-burning automobiles with large national infrastructure that produces ethanol from domestically grown sugarcane.

Ethanol's high miscibility with water makes it unsuitable for shipping through modern pipelines like liquid hydrocarbons.[62] Mechanics have seen increased cases of damage to small engines (in particular, the carburetor) and attribute the damage to the increased water retention by ethanol in fuel.[63]

Ethanol was commonly used as fuel in early bipropellant rocket (liquid-propelled) vehicles, in conjunction with an oxidizer such as liquid oxygen. The German A-4 ballistic rocket of World War II (better known by its propaganda name V-2),[64] which is credited as having begun the space age, used ethanol as the main constituent of B-Stoff. Under such nomenclature, the ethanol was mixed with 25% water to reduce the combustion chamber temperature.[65][66] The V-2's design team helped develop U.S. rockets following World War II, including the ethanol-fueled Redstone rocket, which launched the first U.S. astronaut on suborbital spaceflight.[67][68] Alcohols fell into general disuse as more energy-dense rocket fuels were developed,[66] although ethanol is currently used in lightweight rocket-powered racing aircraft.[69]

Commercial fuel cells operate on reformed natural gas, hydrogen or methanol. Ethanol is an attractive alternative due to its wide availability, low cost, high purity and low toxicity. There is a wide range of fuel cell concepts that have entered trials including direct-ethanol fuel cells, auto-thermal reforming systems and thermally integrated systems. The majority of work is being conducted at a research level although there are a number of organizations at the beginning of the commercialization of ethanol fuel cells.[70]

Ethanol fireplaces can be used for home heating or for decoration. Ethanol can also be used as stove fuel for cooking.[71][72]

Other uses

[edit]
Further information: Alcohol (drug) and Alcoholic drink

As a central nervous system depressant, ethanol is one of the most commonly consumed psychoactive drugs.[73] Despite alcohol's psychoactive, addictive, and carcinogenic properties, it is readily available and legal for sale in many countries. There are laws regulating the sale, exportation/importation, taxation, manufacturing, consumption, and possession of alcoholic beverages. The most common regulation is prohibition for minors.

Ethanol is an important industrial ingredient. It has widespread use as a precursor for other organic compounds such as ethyl halides, ethyl esters, diethyl ether, acetic acid, and ethyl amines. It is considered a universal solvent, as its molecular structure allows for the dissolving of both polar, hydrophilic and nonpolar, hydrophobic compounds. As ethanol also has a low boiling point, it is easy to remove from a solution that has been used to dissolve other compounds, making it a popular extracting agent for botanical oils. Cannabis oil extraction methods often use ethanol as an extraction solvent,[74] and also as a post-processing solvent to remove oils, waxes, and chlorophyll from solution in a process known as winterization.

Ethanol is found in paints, tinctures, markers, and personal care products such as mouthwashes, perfumes and deodorants. Polysaccharides precipitate from aqueous solution in the presence of alcohol, and ethanol precipitation is used for this reason in the purification of DNA and RNA. Because of its low freezing point of −114 °C (−173 °F) and low toxicity, ethanol is sometimes used in laboratories (with dry ice or other coolants) as a cooling bath to keep vessels at temperatures below the freezing point of water. For the same reason, it is also used as the active fluid in alcohol thermometers.

Chemistry

[edit]
Further information: Ethanol (data page)

Ethanol is a 2-carbon alcohol. Its molecular formula is CH3CH2OH. The structure of the molecule of ethanol is CH3−CH2−OH (an ethyl group linked to a hydroxyl group), which indicates that the carbon of a methyl group (CH3−) is attached to the carbon of a methylene group (−CH2–), which is attached to the oxygen of a hydroxyl group (−OH). It is a constitutional isomer of dimethyl ether. Ethanol is sometimes abbreviated as EtOH, using the common organic chemistry notation of representing the ethyl group (C2H5−) with Et.

Physical properties

[edit]
Ethanol burning with its spectrum depicted

Ethanol is a volatile, colorless liquid that has a slight odor. It burns with a smokeless blue flame that is not always visible in normal light. The physical properties of ethanol stem primarily from the presence of its hydroxyl group and the shortness of its carbon chain. Ethanol's hydroxyl group is able to participate in hydrogen bonding, rendering it more viscous and less volatile than less polar organic compounds of similar molecular weight, such as propane.[citation needed] Ethanol's adiabatic flame temperature for combustion in air is 2082 °C or 3779 °F.[75]

Ethanol is slightly more refractive than water, having a refractive index of 1.36242 (at λ=589.3 nm and 18.35 °C or 65.03 °F).[76] The triple point for ethanol is 150 ± 20 K.[77]

Solvent properties

[edit]

Ethanol is a versatile solvent, miscible with water and with many organic solvents, including acetic acid, acetone, benzene, carbon tetrachloride, chloroform, diethyl ether, ethylene glycol, glycerol, nitromethane, pyridine, and toluene. Its main use as a solvent is in making tincture of iodine, cough syrups, etc.[76][78] It is also miscible with light aliphatic hydrocarbons, such as pentane and hexane, and with aliphatic chlorides such as trichloroethane and tetrachloroethylene.[78]

Ethanol's miscibility with water contrasts with the immiscibility of longer-chain alcohols (five or more carbon atoms), whose water miscibility decreases sharply as the number of carbons increases.[79] The miscibility of ethanol with alkanes is limited to alkanes up to undecane: mixtures with dodecane and higher alkanes show a miscibility gap below a certain temperature (about 13 °C for dodecane[80]). The miscibility gap tends to get wider with higher alkanes, and the temperature for complete miscibility increases.

Ethanol-water mixtures have less volume than the sum of their individual components at the given fractions. Mixing equal volumes of ethanol and water results in only 1.92 volumes of mixture.[76][81] Mixing ethanol and water is exothermic, with up to 777 J/mol[82] being released at 298 K.

Hydrogen bonding in solid ethanol at −186 °C

Hydrogen bonding causes pure ethanol to be hygroscopic to the extent that it readily absorbs water from the air. The polar nature of the hydroxyl group causes ethanol to dissolve many ionic compounds, notably sodium and potassium hydroxides, magnesium chloride, calcium chloride, ammonium chloride, ammonium bromide, and sodium bromide.[78] Sodium and potassium chlorides are slightly soluble in ethanol.[78] Because the ethanol molecule also has a nonpolar end, it will also dissolve nonpolar substances, including most essential oils[83] and numerous flavoring, coloring, and medicinal agents.

The addition of even a few percent of ethanol to water sharply reduces the surface tension of water. This property partially explains the "tears of wine" phenomenon. When wine is swirled in a glass, ethanol evaporates quickly from the thin film of wine on the wall of the glass. As the wine's ethanol content decreases, its surface tension increases and the thin film "beads up" and runs down the glass in channels rather than as a smooth sheet.

Azeotrope with water

[edit]

At atmospheric pressure, mixtures of ethanol and water form an azeotrope at about 89.4 mol% ethanol (95.6% ethanol by mass,[84] 97% alcohol by volume), with a boiling point of 351.3 K (78.1 °C).[85] At lower pressure, the composition of the ethanol-water azeotrope shifts to more ethanol-rich mixtures.[86] The minimum-pressure azeotrope has an ethanol fraction of 100%[86] and a boiling point of 306 K (33 °C),[85] corresponding to a pressure of roughly 70 torr (9.333 kPa).[87] Below this pressure, there is no azeotrope, and it is possible to distill absolute ethanol from an ethanol-water mixture.[87]

Flammability

[edit]

An ethanol–water solution will catch fire if heated above a temperature called its flash point and an ignition source is then applied to it.[88] For 20% alcohol by mass (about 25% by volume), this will occur at about 25 °C (77 °F). The flash point of pure ethanol is 13 °C (55 °F),[89] but may be influenced very slightly by atmospheric composition such as pressure and humidity. Ethanol mixtures can ignite below average room temperature. Ethanol is considered a flammable liquid (Class 3 Hazardous Material) in concentrations above 2.35% by mass (3.0% by volume; 6 proof).[90][91][92] Dishes using burning alcohol for culinary effects are called flambé.

Flash points of ethanol–water mixtures[93][91][94]
Ethanol
mole fraction, % 		Temperature
°C °F
1 84.5 184.1[91]
2 64 147[91]
2.35 60 140[91][90]
3 51.5 124.7[91]
5 43 109[93]
6 39.5 103.1[91]
10 31 88[93]
20 25 77[91]
30 24 75[93]
50 20 68[93][91]
70 16 61[93]
80 15.8 60.4[91]
90 14 57[93]
100 12.5 54.5[93][91][89]

Natural occurrence

[edit]

Ethanol is a byproduct of the metabolic process of yeast. As such, ethanol will be present in any yeast habitat. Ethanol can commonly be found in overripe fruit.[95] Ethanol produced by symbiotic yeast can be found in bertam palm blossoms. Although some animal species, such as the pentailed treeshrew, exhibit ethanol-seeking behaviors, most show no interest or avoidance of food sources containing ethanol.[96] Ethanol is also produced during the germination of many plants as a result of natural anaerobiosis.[97]

Ethanol has been detected in outer space, forming an icy coating around dust grains in interstellar clouds.[98] Minute quantity amounts (average 196 ppb) of endogenous ethanol and acetaldehyde were found in the exhaled breath of healthy volunteers.[99] Auto-brewery syndrome, also known as gut fermentation syndrome, is a rare medical condition in which intoxicating quantities of ethanol are produced through endogenous fermentation within the digestive system.[100]

Production

[edit]
94% denatured ethanol sold in a bottle for household use

Ethanol is produced both as a petrochemical, through the hydration of ethylene and, via biological processes, by fermenting sugars with yeast.[101] Which process is more economical depends on prevailing prices of petroleum and grain feed stocks.

Sources

[edit]

World production of ethanol in 2006 was 51 gigalitres (1.3×1010 US gal), with 69% of the world supply coming from Brazil and the U.S.[19] Brazilian ethanol is produced from sugarcane, which has relatively high yields (830% more fuel than the fossil fuels used to produce it) compared to some other energy crops.[102] Sugarcane not only has a greater concentration of sucrose than corn (by about 30%), but is also much easier to extract. The bagasse generated by the process is not discarded, but burned by power plants to produce electricity. Bagasse burning accounts for around 9% of the electricity produced in Brazil.[103]

In the 1970s most industrial ethanol in the U.S. was made as a petrochemical, but in the 1980s the U.S. introduced subsidies for corn-based ethanol.[104] According to the Renewable Fuels Association, as of 30 October 2007, 131 grain ethanol bio-refineries in the U.S. have the capacity to produce 7×10^9 US gal (26,000,000 m3) of ethanol per year. An additional 72 construction projects underway (in the U.S.) can add 6.4 billion US gallons (24,000,000 m3) of new capacity in the next 18 months.[50]

In India ethanol is made from sugarcane.[105] Sweet sorghum is another potential source of ethanol, and is suitable for growing in dryland conditions. The International Crops Research Institute for the Semi-Arid Tropics is investigating the possibility of growing sorghum as a source of fuel, food, and animal feed in arid parts of Asia and Africa.[106] Sweet sorghum has one-third the water requirement of sugarcane over the same time period. It also requires about 22% less water than corn. The world's first sweet sorghum ethanol distillery began commercial production in 2007 in Andhra Pradesh, India.[107]

Ethanol has been produced in the laboratory by converting carbon dioxide via biological and electrochemical reactions.[108][109]

CO2 + H
2O → CH
3CH
2OH + side products

Hydration

[edit]

Ethanol can be produced from petrochemical feed stocks, primarily by the acid-catalyzed hydration of ethylene. It is often referred to as synthetic ethanol.

C2H4 + H2O → C2H5OH

The catalyst is most commonly phosphoric acid,[110][111] adsorbed onto a porous support such as silica gel or diatomaceous earth. This catalyst was first used for large-scale ethanol production by the Shell Oil Company in 1947.[112] The reaction is carried out in the presence of high pressure steam at 300 °C (572 °F) where a 5:3 ethylene to steam ratio is maintained.[113][114] This process was used on an industrial scale by Union Carbide Corporation and others. It is no longer practiced in the US as fermentation ethanol produced from corn is more economical.[115]

In an older process, first practiced on the industrial scale in 1930 by Union Carbide[116] but now almost entirely obsolete, ethylene was hydrated indirectly by reacting it with concentrated sulfuric acid to produce ethyl sulfate, which was hydrolyzed to yield ethanol and regenerate the sulfuric acid:[117]

C2H4 + H2SO4 → C2H5HSO4
C2H5HSO4 + H2O → H2SO4 + C2H5OH

Fermentation

[edit]
Main articles: Ethanol fermentation and Cellulosic ethanol
See also: Yeast in winemaking

Ethanol in alcoholic beverages and fuel is produced by fermentation. Certain species of yeast (e.g., Saccharomyces cerevisiae) metabolize sugar (namely polysaccharides), producing ethanol and carbon dioxide. The chemical equations below summarize the conversion:

C
6H
12O
6 → 2 CH
3CH
2OH + 2 CO2
C
12H
22O
11 + H
2O → 4 CH
3CH
2OH + 4 CO2

Fermentation is the process of culturing yeast under favorable thermal conditions to produce alcohol. This process is carried out at around 35–40 °C (95–104 °F). Toxicity of ethanol to yeast limits the ethanol concentration obtainable by brewing; higher concentrations, therefore, are obtained by fortification or distillation. The most ethanol-tolerant yeast strains can survive up to approximately 18% ethanol by volume.

To produce ethanol from starchy materials such as cereals, the starch must first be converted into sugars. In brewing beer, this has traditionally been accomplished by allowing the grain to germinate, or malt, which produces the enzyme amylase. When the malted grain is mashed, the amylase converts the remaining starches into sugars.

Sugars for ethanol fermentation can be obtained from cellulose. Deployment of this technology could turn a number of cellulose-containing agricultural by-products, such as corncobs, straw, and sawdust, into renewable energy resources. Other agricultural residues such as sugarcane bagasse and energy crops such as switchgrass may also be fermentable sugar sources.[118]

Testing

[edit]
Infrared reflection spectra of liquid ethanol, showing the −OH band centered near 3300 cm−1 and C−H bands near 2950 cm−1
Near-infrared spectrum of liquid ethanol

Breweries and biofuel plants employ two methods for measuring ethanol concentration. Infrared ethanol sensors measure the vibrational frequency of dissolved ethanol using the C−H band at 2900 cm−1. This method uses a relatively inexpensive solid-state sensor that compares the C−H band with a reference band to calculate the ethanol content. The calculation makes use of the Beer–Lambert law. Alternatively, by measuring the density of the starting material and the density of the product, using a hydrometer, the change in specific gravity during fermentation indicates the alcohol content. This inexpensive and indirect method has a long history in the beer brewing industry.

Purification

[edit]

Ethylene hydration or brewing produces an ethanol–water mixture. For most industrial and fuel uses, the ethanol must be purified. Fractional distillation at atmospheric pressure can concentrate ethanol to 95.6% by weight (89.5 mole%). This mixture is an azeotrope with a boiling point of 78.1 °C (172.6 °F), and cannot be further purified by distillation. Addition of an entraining agent, such as benzene, cyclohexane, or heptane, allows a new ternary azeotrope comprising the ethanol, water, and the entraining agent to be formed. This lower-boiling ternary azeotrope is removed preferentially, leading to water-free ethanol.[111]

Apart from distillation, ethanol may be dried by addition of a desiccant, such as molecular sieves, cellulose, or cornmeal. The desiccants can be dried and reused.[111] Molecular sieves can be used to selectively absorb the water from the 95.6% ethanol solution.[119] Molecular sieves of pore-size 3 Ångstrom, a type of zeolite, effectively sequester water molecules while excluding ethanol molecules. Heating the wet sieves drives out the water, allowing regeneration of their desiccant capability.[120]

Membranes can also be used to separate ethanol and water. Membrane-based separations are not subject to the limitations of the water-ethanol azeotrope because the separations are not based on vapor-liquid equilibria. Membranes are often used in the so-called hybrid membrane distillation process. This process uses a pre-concentration distillation column as the first separating step. The further separation is then accomplished with a membrane operated either in vapor permeation or pervaporation mode. Vapor permeation uses a vapor membrane feed and pervaporation uses a liquid membrane feed.

A variety of other techniques have been discussed, including the following:[111]

Grades of ethanol

[edit]
Further information: Denatured alcohol

Pure ethanol and alcoholic beverages are heavily taxed as psychoactive drugs, but ethanol has many uses that do not involve its consumption. To relieve the tax burden on these uses, most jurisdictions waive the tax when an agent has been added to the ethanol to render it unfit to drink. These include bittering agents such as denatonium benzoate and toxins such as methanol, naphtha, and pyridine. Products of this kind are called denatured alcohol.[123][124]

Absolute or anhydrous alcohol refers to ethanol with a low water content. There are various grades with maximum water contents ranging from 1% to a few parts per million (ppm). If azeotropic distillation is used to remove water, it will contain trace amounts of the material separation agent (e.g. benzene).[125] Absolute alcohol is not intended for human consumption. Absolute ethanol is used as a solvent for laboratory and industrial applications, where water will react with other chemicals, and as fuel alcohol. Spectroscopic ethanol is an absolute ethanol with a low absorbance in ultraviolet and visible light, fit for use as a solvent in ultraviolet-visible spectroscopy.[126] Pure ethanol is classed as 200 proof in the US, equivalent to 175 degrees proof in the UK system.[127] Rectified spirit, an azeotropic composition of 96% ethanol containing 4% water, is used instead of anhydrous ethanol for various purposes. Spirits of wine are about 94% ethanol (188 proof). The impurities are different from those in 95% (190 proof) laboratory ethanol.[128]

Reactions

[edit]
Further information: Alcohol (chemistry)

Ethanol is classified as a primary alcohol, meaning that the carbon that its hydroxyl group attaches to has at least two hydrogen atoms attached to it as well. Many ethanol reactions occur at its hydroxyl group.

Ester formation

[edit]

In the presence of acid catalysts, ethanol reacts with carboxylic acids to produce ethyl esters and water:

RCOOH + HOCH2CH3 → RCOOCH2CH3 + H2O

This reaction, which is conducted on large scale industrially, requires the removal of the water from the reaction mixture as it is formed. Esters react in the presence of an acid or base to give back the alcohol and a salt. This reaction is known as saponification because it is used in the preparation of soap. Ethanol can also form esters with inorganic acids. Diethyl sulfate and triethyl phosphate are prepared by treating ethanol with sulfur trioxide and phosphorus pentoxide respectively. Diethyl sulfate is a useful ethylating agent in organic synthesis. Ethyl nitrite, prepared from the reaction of ethanol with sodium nitrite and sulfuric acid, was formerly used as a diuretic.

Dehydration

[edit]

In the presence of acid catalysts, alcohols can be converted to alkenes such as ethanol to ethylene. Typically solid acids such as alumina are used.[129]

CH3CH2OH → H2C=CH2 + H2O

Since water is removed from the same molecule, the reaction is known as intramolecular dehydration. Intramolecular dehydration of an alcohol requires a high temperature and the presence of an acid catalyst such as sulfuric acid.[130] Ethylene produced from sugar-derived ethanol (primarily in Brazil) competes with ethylene produced from petrochemical feedstocks such as naphtha and ethane.[citation needed] At a lower temperature than that of intramolecular dehydration, intermolecular alcohol dehydration may occur producing a symmetrical ether. This is a condensation reaction. In the following example, diethyl ether is produced from ethanol:

2 CH3CH2OH → CH3CH2OCH2CH3 + H2O[131]

Combustion

[edit]

Complete combustion of ethanol forms carbon dioxide and water:

C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (l); −ΔcH = 1371 kJ/mol[132] = 29.8 kJ/g = 327 kcal/mol = 7.1 kcal/g
C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (g); −ΔcH = 1236 kJ/mol = 26.8 kJ/g = 295.4 kcal/mol = 6.41 kcal/g[133]

Specific heat = 2.44 kJ/(kg·K)

Acid-base chemistry

[edit]

Ethanol is a neutral molecule and the pH of a solution of ethanol in water is nearly 7.00. Ethanol can be quantitatively converted to its conjugate base, the ethoxide ion (CH3CH2O−), by reaction with an alkali metal such as sodium:[79]

2 CH3CH2OH + 2 Na → 2 CH3CH2ONa + H2

or a very strong base such as sodium hydride:

CH3CH2OH + NaH → CH3CH2ONa + H2

The acidities of water and ethanol are nearly the same, as indicated by their pKa of 15.7 and 16 respectively. Thus, sodium ethoxide and sodium hydroxide exist in an equilibrium that is closely balanced:

CH3CH2OH + NaOH ⇌ CH3CH2ONa + H2O

Halogenation

[edit]

Ethanol is not used industrially as a precursor to ethyl halides, but the reactions are illustrative. Ethanol reacts with hydrogen halides to produce ethyl halides such as ethyl chloride and ethyl bromide via an SN2 reaction:

CH3CH2OH + HCl → CH3CH2Cl + H2O

HCl requires a catalyst such as zinc chloride.[117] HBr requires refluxing with a sulfuric acid catalyst.[117] Ethyl halides can, in principle, also be produced by treating ethanol with more specialized halogenating agents, such as thionyl chloride or phosphorus tribromide.[79][117]

CH3CH2OH + SOCl2 → CH3CH2Cl + SO2 + HCl

Upon treatment with halogens in the presence of base, ethanol gives the corresponding haloform (CHX3, where X = Cl, Br, I). This conversion is called the haloform reaction.[134] An intermediate in the reaction with chlorine is the aldehyde called chloral, which forms chloral hydrate upon reaction with water:[135]

4 Cl2 + CH3CH2OH → CCl3CHO + 5 HCl
CCl3CHO + H2O → CCl3C(OH)2H

Oxidation

[edit]

Ethanol can be oxidized to acetaldehyde and further oxidized to acetic acid, depending on the reagents and conditions.[117] This oxidation is of no importance industrially, but in the human body, these oxidation reactions are catalyzed by the enzyme liver ADH. The oxidation product of ethanol, acetic acid, is a nutrient for humans, being a precursor to acetyl CoA, where the acetyl group can be spent as energy or used for biosynthesis.

Metabolism

[edit]

Ethanol is similar to macronutrients such as proteins, fats, and carbohydrates in that it provides calories. When consumed and metabolized, it contributes 7 kilocalories per gram via ethanol metabolism.[136]

Safety

[edit]
See also: Alcohol (chemistry) § Toxicity

Ethanol is very flammable and should not be used around an open flame.

Pure ethanol will irritate the skin and eyes.[137] Nausea, vomiting, and intoxication are symptoms of ingestion. Long-term use by ingestion can result in serious liver damage.[138] Atmospheric concentrations above one part per thousand are above the European Union occupational exposure limits.[138]

History

[edit]
Further information: Liquor

The fermentation of sugar into ethanol is one of the earliest biotechnologies employed by humans. Ethanol has historically been identified variously as spirit of wine or ardent spirits,[139] and as aqua vitae or aqua vita. The intoxicating effects of its consumption have been known since ancient times. Ethanol has been used by humans since prehistory as the intoxicating ingredient of alcoholic beverages. Dried residue on 9,000-year-old pottery found in China suggests that Neolithic people consumed alcoholic beverages.[140]

The inflammable nature of the exhalations of wine was already known to ancient natural philosophers such as Aristotle (384–322 BCE), Theophrastus (c. 371–287 BCE), and Pliny the Elder (23/24–79 CE).[141] However, this did not immediately lead to the isolation of ethanol, despite the development of more advanced distillation techniques in second- and third-century Roman Egypt.[142] An important recognition, first found in one of the writings attributed to Jābir ibn Ḥayyān (ninth century CE), was that by adding salt to boiling wine, which increases the wine's relative volatility, the flammability of the resulting vapors may be enhanced.[143] The distillation of wine is attested in Arabic works attributed to al-Kindī (c. 801–873 CE) and to al-Fārābī (c. 872–950), and in the 28th book of al-Zahrāwī's (Latin: Abulcasis, 936–1013) Kitāb al-Taṣrīf (later translated into Latin as Liber servatoris).[144] In the twelfth century, recipes for the production of aqua ardens ("burning water", i.e., ethanol) by distilling wine with salt started to appear in a number of Latin works, and by the end of the thirteenth century it had become a widely known substance among Western European chemists.[145]

The works of Taddeo Alderotti (1223–1296) describe a method for concentrating ethanol involving repeated fractional distillation through a water-cooled still, by which an ethanol purity of 90% could be obtained.[146] The medicinal properties of ethanol were studied by Arnald of Villanova (1240–1311 CE) and John of Rupescissa (c. 1310–1366), the latter of whom regarded it as a life-preserving substance able to prevent all diseases (the aqua vitae or "water of life", also called by John the quintessence of wine).[147] In China, archaeological evidence indicates that the true distillation of alcohol began during the Jin (1115–1234) or Southern Song (1127–1279) dynasties.[148] A still has been found at an archaeological site in Qinglong, Hebei, dating to the 12th century.[148] In India, the true distillation of alcohol was introduced from the Middle East, and was in wide use in the Delhi Sultanate by the 14th century.[149]

In 1796, German-Russian chemist Johann Tobias Lowitz obtained pure ethanol by mixing partially purified ethanol (the alcohol-water azeotrope) with an excess of anhydrous alkali and then distilling the mixture over low heat.[150] French chemist Antoine Lavoisier described ethanol as a compound of carbon, hydrogen, and oxygen, and in 1807 Nicolas-Théodore de Saussure determined ethanol's chemical formula.[151][152] Fifty years later, Archibald Scott Couper published the structural formula of ethanol, one of the first structural formulas determined.[153]

Ethanol was first prepared synthetically in 1825 by Michael Faraday. He found that sulfuric acid could absorb large volumes of coal gas.[154] He gave the resulting solution to Henry Hennell, a British chemist, who found in 1826 that it contained "sulphovinic acid" (ethyl hydrogen sulfate).[155] In 1828, Hennell and the French chemist Georges-Simon Serullas independently discovered that sulphovinic acid could be decomposed into ethanol.[156][157] Thus, in 1825 Faraday had unwittingly discovered that ethanol could be produced from ethylene (a component of coal gas) by acid-catalyzed hydration, a process similar to current industrial ethanol synthesis.[158]

Ethanol was used as lamp fuel in the U.S. as early as 1840, but a tax levied on industrial alcohol during the Civil War made this use uneconomical. The tax was repealed in 1906.[159] Use as an automotive fuel dates back to 1908, with the Ford Model T able to run on petrol (gasoline) or ethanol.[160] It fuels some spirit lamps.

Ethanol intended for industrial use is often produced from ethylene.[161] Ethanol has widespread use as a solvent of substances intended for human contact or consumption, including scents, flavorings, colorings, and medicines. In chemistry, it is both a solvent and a feedstock for the synthesis of other products. It has a long history as a fuel for heat and light, and more recently as a fuel for internal combustion engines.

See also

[edit]

References

[edit]
  1. ^ Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge, UK: The Royal Society of Chemistry. 2014. p. 30. doi:10.1039/9781849733069-00001. ISBN 978-0-85404-182-4.
  2. ^ "Ethanol". PubChem. Retrieved 29 December 2022.
  3. ^ a b c d Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. p. 3.246. ISBN 1-4398-5511-0.
  4. ^ Ballinger P, Long FA (1960). "Acid Ionization Constants of Alcohols. II. Acidities of Some Substituted Methanols and Related Compounds1,2". Journal of the American Chemical Society. 82 (4): 795–798. doi:10.1021/ja01489a008. ISSN 0002-7863.
  5. ^ Arnett EM, Venkatasubramaniam KG (1983). "Thermochemical acidities in three superbase systems". J. Org. Chem. 48 (10): 1569–1578. doi:10.1021/jo00158a001.
  6. ^ Lide DR, ed. (2012). CRC Handbook of Chemistry and Physics (92 ed.). Boca Raton, FL: CRC Press/Taylor and Francis. pp. 6–232.
  7. ^ Lide DR, ed. (2008). CRC Handbook of Chemistry and Physics (89 ed.). Boca Raton, FL: CRC Press. pp. 9–55.
  8. ^ "MSDS Ethanol". Retrieved 12 January 2023.
  9. ^ "Ethanol". webwiser.nlm.nih.gov. Retrieved 25 June 2021.
  10. ^ a b NIOSH Pocket Guide to Chemical Hazards. "#0262". National Institute for Occupational Safety and Health (NIOSH).
  11. ^ "Ethyl Alcohol". Retrieved 23 December 2023.
  12. ^ "Ethyl Alcohol". 2 November 2018. Retrieved 23 December 2023.
  13. ^ "Ethanol". PubChem. National Library of Medicine. Retrieved 28 September 2021.
  14. ^ "Ethyl Alcohol" (PDF). Hazardous Substance Fact Sheet. New Jersey Department of Health. Retrieved 28 September 2021.
  15. ^ Black (1875). Encyclopædia Britannica, Vol. 1. Edinburgh: Adam and Charles Black. p. 470.
  16. ^ Song, Frank; Walker, Matthew P. (8 November 2023). "Sleep, alcohol, and caffeine in financial traders". PLOS ONE. 18 (11): e0291675. Bibcode:2023PLoSO..1891675S. doi:10.1371/journal.pone.0291675. ISSN 1932-6203. PMC 10631622. PMID 37939019.
  17. ^ a b Powell MA (2004). "9: Wine and the vine in ancient Mesopotamia: the cuneiform evidence". In McGovern PE, Fleming SJ, Katz SH (eds.). The Origins and Ancient History of Wine. Food and Nutrition in History and Anthropology. Vol. 11 (1 ed.). Amsterdam: Taylor & Francis. pp. 96–124. ISBN 978-0-203-39283-6. ISSN 0275-5769. Retrieved 15 September 2010.
  18. ^ a b Schnelle, Norbert (August 1965). "Alcohol Given Intravenously for General Anesthesia". Surgical Clinics of North America. 45 (4): 1041–1049. doi:10.1016/S0039-6109(16)37650-2. PMID 14312998. Retrieved 30 December 2022.
  19. ^ a b "2008 World Fuel Ethanol Production". Ellisville, Missouri: Renewable Fuels Association. Retrieved 21 June 2024.
  20. ^ "Ethanol – Compound Summary". The PubChem Project. Bethesda, MD: National Center for Biotechnology Information.
  21. ^ Liebig J (1834). "Ueber die Constitution des Aethers und seiner Verbindungen" [On the constitution of ether and its compounds]. Annalen der Pharmacie (in German). 9 (22): 1–39. Bibcode:1834AnP...107..337L. doi:10.1002/andp.18341072202. From page 18: "Bezeichnen wir die Kohlenwasserstoffverbindung 4C + 10H als das Radikal des Aethers mit E2 und nennen es Ethyl, ..." (Let us designate the hydrocarbon compound 4C + 10H as the radical of ether with E2 and name it ethyl ...).
  22. ^ Harper, Douglas. "ethyl". Online Etymology Dictionary.
  23. ^ For a report on the 1892 International Conference on Chemical Nomenclature, see:
  24. ^ Multhauf, Robert P. (1966). The Origins of Chemistry. London: Oldbourne. ISBN 9782881245947. p. 205; OED; etymonline.com
  25. ^ Berthelot, Marcellin; Houdas, Octave V. (1893). La Chimie au Moyen Âge. Vol. I. Paris: Imprimerie nationale. p. 136.
  26. ^ Kaveh, Anthony. "3 Natural, Ancient Anesthetics No One Talks About: Opium, Alcohol, Marijuana". Dr. Anthony Kaveh, MD. Retrieved 30 December 2022.
  27. ^ Grattan, N. "Treatment of Uterine Haemorrhage". Provincial Medicine and Surgical Journal. Vol. 1, No. 6 (Nov. 7, 1840), p. 107.
  28. ^ Pohorecky, Larissa A.; Brick, John (January 1988). "Pharmacology of ethanol". Pharmacology & Therapeutics. 36 (2–3): 335–427. doi:10.1016/0163-7258(88)90109-X. PMID 3279433.
  29. ^ McDonnell G, Russell AD (January 1999). "Antiseptics and disinfectants: activity, action, and resistance". Clinical Microbiology Reviews. 12 (1): 147–179. doi:10.1128/CMR.12.1.147. PMC 88911. PMID 9880479.
  30. ^ "Chemical Disinfectants | Disinfection & Sterilization Guidelines | Guidelines Library | Infection Control | CDC". www.cdc.gov. Retrieved 29 January 2018.
  31. ^ "Why is 70% ethanol used for wiping microbiological working areas?". ResearchGate. Retrieved 29 January 2018.
  32. ^ "Ethanol". www.drugbank.ca. Retrieved 28 January 2019.
  33. ^ Scalley R (September 2002). "Treatment of Ethylene Glycol Poisoning". American Family Physician. 66 (5): 807–813. PMID 12322772. Retrieved 15 January 2018.
  34. ^ Beauchamp, GA; Valento, M (September 2016). "Toxic Alcohol Ingestion: Prompt Recognition And Management In The Emergency Department". Emergency Medicine Practice. 18 (9): 1–20. PMID 27538060.
  35. ^ Sasanami, Misa; Yamada, Taihei; Obara, Takafumi; Nakao, Atsunori; Naito, Hiromichi (2020). "Oral Ethanol Treatment for Ethylene Glycol Intoxication". Cureus. 12 (12): e12268. doi:10.7759/cureus.12268. ISSN 2168-8184. PMC 7827791. PMID 33510981.
  36. ^ Anseeuw, Kurt; Sabbe, Marc B.; Legrand, Annemie (April 2008). "Methanol poisoning: the duality between 'fast and cheap' and 'slow and expensive'". European Journal of Emergency Medicine. 15 (2): 107–109. doi:10.1097/MEJ.0b013e3282f3c13b. ISSN 0969-9546. PMID 18446077. S2CID 23861841.
  37. ^ "Alcohol Content in Common Preparations" (PDF). Medical Society of the State of New York. Archived from the original (PDF) on 29 April 2021. Retrieved 8 October 2019.
  38. ^ Adams KE, Rans TS (December 2013). "Adverse reactions to alcohol and alcoholic beverages". Annals of Allergy, Asthma & Immunology. 111 (6): 439–445. doi:10.1016/j.anai.2013.09.016. PMID 24267355.
  39. ^ Zuccotti GV, Fabiano V (July 2011). "Safety issues with ethanol as an excipient in drugs intended for pediatric use". Expert Opinion on Drug Safety. 10 (4): 499–502. doi:10.1517/14740338.2011.565328. PMID 21417862. S2CID 41876817.
  40. ^ Farrés J, Moreno A, Crosas B, Peralba JM, Allali-Hassani A, Hjelmqvist L, et al. (September 1994). "Alcohol dehydrogenase of class IV (σσ-ADH) from human stomach. cDNA sequence and structure/function relationships". European Journal of Biochemistry. 224 (2): 549–557. doi:10.1111/j.1432-1033.1994.00549.x. PMID 7925371.
  41. ^ Edenberg HJ, McClintick JN (December 2018). "Alcohol Dehydrogenases, Aldehyde Dehydrogenases, and Alcohol Use Disorders: A Critical Review". Alcoholism: Clinical and Experimental Research. 42 (12): 2281–2297. doi:10.1111/acer.13904. PMC 6286250. PMID 30320893.
  42. ^ Heit, C.; Dong, H.; Chen, Y.; Thompson, D.C.; Dietrich, R.A.; Vasiliou, V.K. (2013). "The Role of CYP2E1 in Alcohol Metabolism and Sensitivity in the Central Nervous System". Cytochrome P450 2E1: Its Role in Disease and Drug Metabolism. Subcellular Biochemistry. Vol. 67. pp. 235–237. doi:10.1007/978-94-007-5881-0_8. ISBN 978-94-007-5880-3. PMC 4314297. PMID 23400924.
  43. ^ "Alcohol Metabolism: An Update". NIAA Publications. National Institute of Health. Archived from the original on 28 February 2021. Retrieved 10 March 2021.
  44. ^ a b Eng MY, Luczak SE, Wall TL (2007). "ALDH2, ADH1B, and ADH1C genotypes in Asians: a literature review". Alcohol Research & Health. 30 (1): 22–27. PMC 3860439. PMID 17718397.
  45. ^ a b Eyidogan M, Ozsezen AN, Canakci M, Turkcan A (2010). "Impact of alcohol–gasoline fuel blends on the performance and combustion characteristics of an SI engine". Fuel. 89 (10): 2713–2720. Bibcode:2010Fuel...89.2713E. doi:10.1016/j.fuel.2010.01.032.
  46. ^ a b Thomas, George (2000). "Overview of Storage Development DOE Hydrogen Program" (PDF). Livermore, California: Sandia National Laboratories. Archived from the original (PDF) on 21 February 2007.
  47. ^ Thomas G (2000). "Overview of Storage Development DOE Hydrogen Program" (PDF). Sandia National Laboratories. Retrieved 1 August 2009.
  48. ^ "Availability of Sources of E85". Clean Air Trust. Retrieved 27 July 2015.
  49. ^ "Fuel ethanol production worldwide". Statista. Retrieved 2 June 2021.
  50. ^ a b "First Commercial U.S. Cellulosic Ethanol Biorefinery Announced". Renewable Fuels Association. 20 November 2006. Retrieved 31 May 2011.
  51. ^ Green R. "Model T Ford Club Australia (Inc.)". Archived from the original on 14 January 2014. Retrieved 24 June 2011.
  52. ^ "Ethanol 101". American Coalition for Ethanol. Archived from the original on 14 November 2020. Retrieved 26 March 2011.
  53. ^ Energy Future Coalition. "The Biofuels FAQs". The Biofuels Source Book. United Nations Foundation. Archived from the original on 19 February 2011.
  54. ^ Malaquias, Augusto César Teixeira; Netto, Nilton Antonio Diniz; Filho, Fernando Antonio Rodrigues; da Costa, Roberto Berlini Rodrigues; Langeani, Marcos; Baêta, José Guilherme Coelho (18 November 2019). "The misleading total replacement of internal combustion engines by electric motors and a study of the Brazilian ethanol importance for the sustainable future of mobility: a review". Journal of the Brazilian Society of Mechanical Sciences and Engineering. 41 (12): 567. doi:10.1007/s40430-019-2076-1. ISSN 1806-3691.
  55. ^ California Air Resources Board (October 1989). "Definition of a Low Emission Motor Vehicle in Compliance with the Mandates of Health and Safety Code Section 39037.05, second release". Archived from the original on 18 February 2018. Retrieved 18 February 2018.
  56. ^ Lowi A, Carter WP (March 1990). A Method for Evaluating the Atmospheric Ozone Impact of Actual Vehicle emissions. Warrendale, Pennsylvania. {{cite book}}: |work= ignored (help)CS1 maint: location missing publisher (link)
  57. ^ Jones TT (2008). "The Clean Fuels Report: A Quantitative Comparison Of Motor (engine) Fuels, Related Pollution and Technologies". researchandmarkets.com. Archived from the original on 9 September 2012.
  58. ^ Tao R (16–20 August 2010). Electro-rheological Fluids and Magneto-rheological Suspensions. Philadelphia: World Scientific. ISBN 9789814340229. {{cite book}}: |work= ignored (help)
  59. ^ Biello D. "Want to Reduce Air Pollution? Don't Rely on Ethanol Necessarily". Scientific American. Retrieved 11 July 2017.
  60. ^ "Adoption of the Airborne Toxic Control Measure to Reduce Formaldehyde Emissions from Composite Wood Products". Chicago & Washington, DC: Window and Door Manufacturers Association. 30 July 2008. Archived from the original on 9 March 2010.
  61. ^ "Tecnologia flex atrai estrangeiros" (in Brazilian Portuguese). Agência Estado.
  62. ^ Horn M, Krupp F (16 March 2009). Earth: The Sequel: The Race to Reinvent Energy and Stop Global Warming. Vol. 62. pp. 63–65. Bibcode:2009PhT....62d..63K. doi:10.1063/1.3120901. ISBN 978-0-393-06810-8. S2CID 153892198. {{cite book}}: |journal= ignored (help)
  63. ^ "Mechanics see ethanol damaging small engines"Archived 23 September 2020 at the Wayback Machine, NBC News, 8 January 2008
  64. ^ Clark, John. D. (1972). Ignition! an informal history of liquid rocket propellants. Foreword by Isaac Asimov. Rutgers University Press. p. 9. ISBN 978-0-8135-0725-5.
  65. ^ Darling D. "The Internet Encyclopedia of Science: V-2". Retrieved 27 July 2024.
  66. ^ a b "Basics of Space Flight: Rocket Propellants". braeunig.us. Retrieved 11 March 2023.
  67. ^ "A Brief History of Rocketry". NASA Historical Archive. Archived from the original on 5 August 2006.
  68. ^ Kuettner, Joachim P.; Bertram, Emil (October 1963). "Mercury-Redstone Launch-Vehicle development and performance" (PDF). Mercury Project Summary Including Results of the Fourth Manned Orbital Flight: May 15 and 16, 1963. p. 70. NASA-SP-45 – via NTRS.
  69. ^ Chow D (26 April 2010). "Rocket Racing League Unveils New Flying Hot Rod". Space.com. Archived from the original on 8 March 2014. Retrieved 27 July 2024.
  70. ^ Badwal SP, Giddey S, Kulkarni A, Goel J, Basu S (May 2015). "Direct ethanol fuel cells for transport and stationary applications – A comprehensive review". Applied Energy. 145: 80–103. Bibcode:2015ApEn..145...80B. doi:10.1016/j.apenergy.2015.02.002.
  71. ^ Immergut, Debra Jo (3 December 2015). "Can Ethanol Fireplaces Be Cozy?". The Wall Street Journal. Retrieved 2 March 2016.
  72. ^ Rajvanshi AK, Patil SM, Mendonca B (March 2007). "Low-concentration ethanol stove for rural areas in India". Energy for Sustainable Development. 11 (1): 94–99. Bibcode:2007ESusD..11...94R. CiteSeerX 10.1.1.142.5846. doi:10.1016/S0973-0826(08)60568-2.
  73. ^ "Alcohol use and safe drinking: MedlinePlus Medical Encyclopedia". medlineplus.gov. Retrieved 11 March 2023.
  74. ^ "Your Guide to Ethanol Extraction". Cannabis Business Times. Retrieved 9 April 2019.
  75. ^ "Flame Temperature Analysis and NOx Emissions for Different Fuels". Mississippi State Department of Chemical Engineering.
  76. ^ a b c Lide DR, ed. (2000). CRC Handbook of Chemistry and Physics 81st edition. CRC press. ISBN 978-0-8493-0481-1.
  77. ^ "Ethanol". NIST Chemistry WebBook, SRD 69. 2023. Retrieved 23 December 2023.
  78. ^ a b c d Windholz M (1976). The Merck index: an encyclopedia of chemicals and drugs (9th ed.). Rahway, NJ: Merck. ISBN 978-0-911910-26-1.[page needed]
  79. ^ a b c Morrison RT, Boyd RN (1972). Organic Chemistry (2nd ed.). Allyn and Bacon, inc. ISBN 978-0-205-08452-4.[page needed]
  80. ^ Dahlmann U, Schneider GM (1989). "(Liquid + liquid) phase equilibria and critical curves of (ethanol + dodecane or tetradecane or hexadecane or 2,2,4,4,6,8,8-heptamethylnonane) from 0.1 MPa to 120.0 MPa". J Chem Thermodyn. 21 (9): 997–1004. Bibcode:1989JChTh..21..997D. doi:10.1016/0021-9614(89)90160-2.
  81. ^ "Ethanol". Encyclopedia of chemical technology. Vol. 9. 1991. p. 813.
  82. ^ Costigan MJ, Hodges LJ, Marsh KN, Stokes RH, Tuxford CW (1980). "The Isothermal Displacement Calorimeter: Design Modifications for Measuring Exothermic Enthalpies of Mixing". Aust. J. Chem. 33 (10): 2103. Bibcode:1982AuJCh..35.1971I. doi:10.1071/CH9802103.
  83. ^ Merck Index of Chemicals and Drugs, 9th ed.; monographs 6575 through 6669
  84. ^ National Institute of Standards and Technology. "Standard Reference Material 1828: Ethanol-Water Solutions" (PDF).
  85. ^ a b Pemberton RC, Mash CJ (1978). "Thermodynamic properties of aqueous non-electrolyte mixtures II. Vapour pressures and excess Gibbs energies for water + ethanol at 303.15 to 363.15 K determined by an accurate static method". J Chem Thermodyn. 10 (9): 867–888. Bibcode:1978JChTh..10..867P. doi:10.1016/0021-9614(78)90160-X.
  86. ^ a b Beebe, A. H.; Coulter, K. E.; Lindsay, R. A.; Baker, E. M. (December 1942). "Equilibria in Ethanol-Water System at Pressures Less Than Atmospheric". Industrial & Engineering Chemistry. 34 (12): 1501–1504. doi:10.1021/ie50396a019.
  87. ^ a b "6.4 Pressure swing distillation | Hyper-TVT: on line Thermische VerfahrensTechnik". Institute of Process Engineering | ETH Zurich. 10 November 2003. Retrieved 12 October 2024.
  88. ^ "Flash Point and Fire Point". Nttworldwide.com. Archived from the original on 14 December 2010.
  89. ^ a b NFPA 325: Guide to Fire Hazard Properties of Flammable Liquids, Gases, and Volatile Solids. Quincy, Massachusetts: National Fire Protection Association (NFPA). 1 January 1994.
  90. ^ a b "49 CFR § 173.120 – Class 3 – Definitions". Legal Information Institute. a flammable liquid (Class 3) means a liquid having a flash point of not more than 60 °C (140 °F)
  91. ^ a b c d e f g h i j k Martínez, P. J.; Rus, E.; Compaña, J. M. "Flash Point Determination of Binary Mixtures of Alcohols, Ketones and Water". Departamento de Ingeniería Química, Facultad de Ciencias. p. 3, Table 4.
  92. ^ "49 CFR § 172.101 – Purpose and use of hazardous materials table". Legal Information Institute, Cornell University. Hazardous materials descriptions and proper shipping names: Ethanol or Ethyl alcohol or Ethanol solutions or Ethyl alcohol solutions; Hazard class or Division: 3; Identification Numbers: UN1170; PG: II; Label Codes: 3;
  93. ^ a b c d e f g h Ha, Dong-Myeong; Park, Sang Hun; Lee, Sungjin (April 2015). "The Measurement of Flash Point of Water-Methanol and Water-Ethanol Systems Using Seta Flash Closed Cup Tester". Fire Science and Engineering. 29 (2): 39–43. doi:10.7731/KIFSE.2015.29.2.039. Page 4, Table 3
  94. ^ "Flash points of ethanol-based water solutions". Engineeringtoolbox.com. Retrieved 23 June 2011.
  95. ^ Dudley R (August 2004). "Ethanol, fruit ripening, and the historical origins of human alcoholism in primate frugivory". Integrative and Comparative Biology. 44 (4): 315–323. doi:10.1093/icb/44.4.315. PMID 21676715.
  96. ^ Graber C (2008). "Fact or Fiction?: Animals Like to Get Drunk". Scientific American. Retrieved 23 July 2010.
  97. ^ Leblová S, Sinecká E, Vaníčková V (1974). "Pyruvate metabolism in germinating seeds during natural anaerobiosis". Biologia Plantarum. 16 (6): 406–411. doi:10.1007/BF02922229. S2CID 34605254.
  98. ^ Schriver A, Schriver-Mazzuoli L, Ehrenfreund P, d'Hendecourt L (2007). "One possible origin of ethanol in interstellar medium: Photochemistry of mixed CO2–C2H6 films at 11 K. A FTIR study". Chemical Physics. 334 (1–3): 128–137. Bibcode:2007CP....334..128S. doi:10.1016/j.chemphys.2007.02.018.
  99. ^ Turner C, Spanel P, Smith D (2006). "A longitudinal study of ethanol and acetaldehyde in the exhaled breath of healthy volunteers using selected-ion flow-tube mass spectrometry". Rapid Communications in Mass Spectrometry. 20 (1): 61–68. Bibcode:2006RCMS...20...61T. doi:10.1002/rcm.2275. PMID 16312013.
  100. ^ Doucleff M (17 September 2013). "Auto-Brewery Syndrome: Apparently, You Can Make Beer In Your Gut". NPR.
  101. ^ Mills GA, Ecklund EE (1987). "Alcohols as Components of Transportation Fuels". Annual Review of Energy. 12: 47–80. doi:10.1146/annurev.eg.12.110187.000403.
  102. ^ Reel M (19 August 2006). "Brazil's Road to Energy Independence". The Washington Post.
  103. ^ Rossi, Liane M.; Gallo, Jean Marcel R.; Mattoso, Luiz H. C.; Buckeridge, Marcos S.; Licence, Peter; Allen, David T. (29 March 2021). "Ethanol from Sugarcane and the Brazilian Biomass-Based Energy and Chemicals Sector". ACS Sustainable Chemistry & Engineering. 9 (12): 4293–4295. doi:10.1021/acssuschemeng.1c01678. ISSN 2168-0485. S2CID 233676614.
  104. ^ Wittcoff HA, Reuben BG, Plotkin JS (2004). Industrial Organic Chemicals. John Wiley & Sons. pp. 136–. ISBN 978-0-471-44385-8.
  105. ^ Swami, V. N. (2020). विद्याभराती जिल्हा मध्यवर्ती सहकारी बँक भारती परीक्षा मार्गदर्शक [Vidyabharti District Co-operative Bank recruitment examination guide (Bank clerk grade examination)] (in Marathi). Latur, Maharashtra, India: Vidyabharti Publication. p. 119.
  106. ^ "Sweet sorghum for food, feed and fuel" (PDF). New Agriculturalist. January 2008. Archived from the original (PDF) on 4 September 2015. Retrieved 11 March 2023.
  107. ^ "Developing a sweet sorghum ethanol value chain" Archived 23 February 2014 at the Wayback Machine. ICRISAT, 2013
  108. ^ Liew F, Henstra AM, Köpke M, Winzer K, Simpson SD, Minton NP (March 2017). "Metabolic engineering of Clostridium autoethanogenum for selective alcohol production". Metabolic Engineering. 40: 104–114. doi:10.1016/j.ymben.2017.01.007. PMC 5367853. PMID 28111249.
  109. ^ "Solar-to-Fuel System Recycles CO2 for Ethanol and Ethylene". News Center. 18 September 2017. Retrieved 19 September 2017.
  110. ^ Roberts JD, Caserio MC (1977). Basic Principles of Organic Chemistry. W. A. Benjamin. ISBN 978-0-8053-8329-4.[page needed]
  111. ^ a b c d Kosaric N, Duvnjak Z, Farkas A, Sahm H, Bringer-Meyer S, Goebel O, Mayer D (2011). "Ethanol". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. pp. 1–72. doi:10.1002/14356007.a09_587.pub2. ISBN 978-3-527-30673-2.(subscription required)
  112. ^ "Ethanol". Encyclopedia of chemical technology. Vol. 9. 1991. p. 82.
  113. ^ "Ethanol" Archived 13 January 2015 at the Wayback Machine. Essential Chemical Industry.
  114. ^ Harrison, Tim (May 2014). "Catalysis Web Pages for Pre-University Students V1_0" (PDF). Bristol ChemLabs, School of Chemistry. University of Bristol. Archived from the original (PDF) on 5 March 2021.
  115. ^ Tullo, Alexander (26 August 2021). "Last synthetic ethanol plant in US to close". cen.acs.org. Retrieved 22 November 2022.
  116. ^ Lodgsdon JE (1991). "Ethanol". In Howe-Grant M, Kirk RE, Othmer DF, Kroschwitz JI (eds.). Encyclopedia of chemical technology. Vol. 9 (4th ed.). New York: Wiley. p. 817. ISBN 978-0-471-52669-8.
  117. ^ a b c d e Streitwieser A, Heathcock CH (1976). Introduction to Organic Chemistry. MacMillan. ISBN 978-0-02-418010-0.
  118. ^ Clines T (July 2006). "Brew Better Ethanol". Popular Science Online. Archived from the original on 3 November 2007.
  119. ^ Chemists, American Association of Cereal (1986). Advances in Cereal Science and Technology. American Association of Cereal Chemists, Incorporated. ISBN 978-0-913250-45-7.
  120. ^ Dale Callaham, Molecular Sieve Information
  121. ^ Song Y, Peng R, Hensley DK, Bonnesen PV, Liang L, Wu Z, Meyer HM, Chi M, Ma C, Sumpter BG, Rondinone AJ (2016). "High-Selectivity Electrochemical Conversion of CO2 to Ethanol using a Copper Nanoparticle/N-Doped Graphene Electrode". ChemistrySelect. 1 (Preprint): 6055–6061. doi:10.1002/slct.201601169.
  122. ^ Jeong JS, Jeon H, Ko Km, Chung B, Choi GW (2012). "Production of anhydrous ethanol using various PSA (Pressure Swing Adsorption) processes in pilot plant". Renewable Energy. 42: 41–45. Bibcode:2012REne...42...41J. doi:10.1016/j.renene.2011.09.027.
  123. ^ "U-M Program to Reduce the Consumption of Tax-free Alcohol; Denatured Alcohol a Safer, Less Expensive Alternative" (PDF). University of Michigan. Archived from the original (PDF) on 27 November 2007. Retrieved 29 September 2007.
  124. ^ Great Britain (2005). The Denatured Alcohol Regulations 2005 Archived 9 December 2009 at the Wayback Machine. Statutory Instrument 2005 No. 1524.
  125. ^ Bansal RK, Bernthsen A (2003). A Textbook of Organic Chemistry. New Age International Limited. pp. 402–. ISBN 978-81-224-1459-2.
  126. ^ Christian GD (2004). "Solvents for Spectrometry". Analytical chemistry. Vol. 1 (6th ed.). Hoboken, NJ: John Wiley & Sons. p. 473. ISBN 978-0-471-21472-4.
  127. ^ Andrews S (1 August 2007). Textbook Of Food & Bevrge Mgmt. Tata McGraw-Hill Education. pp. 268–. ISBN 978-0-07-065573-7.
  128. ^ Kunkee RE, Amerine MA (July 1968). "Sugar and alcohol stabilization of yeast in sweet wine". Applied Microbiology. 16 (7): 1067–1075. doi:10.1128/AEM.16.7.1067-1075.1968. PMC 547590. PMID 5664123.
  129. ^ Zimmermann, Heinz; Walz, Roland (2008). "Ethylene". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a10_045.pub3. ISBN 978-3-527-30673-2.
  130. ^ "14.4: Dehydration Reactions of Alcohols". Chemistry LibreTexts. 9 February 2016. Retrieved 9 May 2022.
  131. ^ "Alkenes from Dehydration of Alcohols". Chemistry LibreTexts. 2 October 2013. Retrieved 9 May 2022.
  132. ^ Rossini FD (1937). "Heats of Formation of Simple Organic Molecules". Ind. Eng. Chem. 29 (12): 1424–1430. doi:10.1021/ie50336a024.
  133. ^ Calculated from heats of formation from CRC Handbook of Chemistry and Physics, 49th Edition, 1968–1969.
  134. ^ Chakrabartty SK (1978). Trahanovsky WS (ed.). Oxidation in Organic Chemistry. New York: Academic Press. pp. 343–370.
  135. ^ Reinhard J, Kopp E, McKusick BC, Röderer G, Bosch A, Fleischmann G (2007). "Chloroacetaldehydes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a06_527.pub2. ISBN 978-3-527-30673-2.
  136. ^ Cederbaum, Arthur I (16 November 2012). "Alcohol Metabolism". Clinics in Liver Disease. 16 (4): 667–685. doi:10.1016/j.cld.2012.08.002. ISSN 1089-3261. PMC 3484320. PMID 23101976.
  137. ^ Minutes of Meeting Archived 16 April 2021 at the Wayback Machine. Technical Committee on Classification and Properties of Hazardous Chemical Data (12–13 January 2010).
  138. ^ a b "Safety data for ethyl alcohol". University of Oxford. 9 May 2008. Archived from the original on 14 July 2011. Retrieved 3 January 2011.
  139. ^ Ottley, William Campbell (1826). A dictionary of chemistry and of mineralogy as connected with it. Murray.
  140. ^ Roach J (18 July 2005). "9,000-Year-Old Beer Re-Created From Chinese Recipe". National Geographic News. Archived from the original on 22 July 2005. Retrieved 3 September 2007.
  141. ^ Berthelot & Houdas 1893, vol. I, p. 137.
  142. ^ Berthelot & Houdas 1893, vol. I, pp. 138-139.
  143. ^ al-Hassan, Ahmad Y. (2009). "Alcohol and the Distillation of Wine in Arabic Sources from the 8th Century". Studies in al-Kimya': Critical Issues in Latin and Arabic Alchemy and Chemistry. Hildesheim: Georg Olms Verlag. pp. 283–298. (same content also available on the author's website Archived 29 December 2015 at the Wayback Machine).
  144. ^ al-Hassan 2009 (same content also available on the author's website Archived 29 December 2015 at the Wayback Machine); cf. Berthelot & Houdas 1893, vol. I, pp. 141, 143. Sometimes, sulfur was also added to the wine (see Berthelot & Houdas 1893, vol. I, p. 143).
  145. ^ Multhauf 1966, pp. 204–206.
  146. ^ Holmyard, Eric John (1957). Alchemy. Harmondsworth: Penguin Books. ISBN 978-0-486-26298-7. pp. 51–52.
  147. ^ Principe, Lawrence M. (2013). The Secrets of Alchemy. Chicago: The University of Chicago Press. ISBN 978-0-226-10379-2. pp. 69-71.
  148. ^ a b Haw SG (2006). "Wine, women and poison". Marco Polo in China. Routledge. pp. 147–148. ISBN 978-1-134-27542-7. Retrieved 10 July 2016. The earliest possible period seems to be the Eastern Han dynasty... the most likely period for the beginning of true distillation of spirits for drinking in China is during the Jin and Southern Song dynasties
  149. ^ Habib, Irfan (2011). Economic History of Medieval India, 1200–1500. Pearson Education India. pp. 55–. ISBN 978-81-317-2791-1.
  150. ^ Lowitz T (1796). "Anzeige eines, zur volkommen Entwasserung des Weingeistes nothwendig zu beobachtenden, Handgriffs" [Report of a task that must be done for the complete dehydration of wine spirits [i.e., alcohol-water azeotrope])]. Chemische Annalen für die Freunde der Naturlehre, Aerznengelartheit, Haushaltungskunde und Manufakturen (in German). 1: 195–204. See pp. 197–198: Lowitz dehydrated the azeotrope by mixing it with a 2:1 excess of anhydrous alkali and then distilling the mixture over low heat.
  151. ^ Chisholm, Hugh, ed. (1911). "Alcohol" . Encyclopædia Britannica. Vol. 1 (11th ed.). Cambridge University Press. pp. 525–527.
  152. ^ de Saussure T (1807). "Mémoire sur la composition de l'alcohol et de l'éther sulfurique". Journal de Physique, de Chimie, d'Histoire Naturelle et des Arts. 64: 316–354. In his 1807 paper, Saussure determined ethanol's composition only roughly; a more accurate analysis of ethanol appears on page 300 of his 1814 paper: de Saussure, Théodore (1814). "Nouvelles observations sur la composition de l'alcool et de l'éther sulfurique". Annales de Chimie et de Physique. 89: 273–305.
  153. ^ Couper AS (1858). "On a new chemical theory" (online reprint). Philosophical Magazine. 16 (104–116). Retrieved 3 September 2007.
  154. ^ Faraday M (1825). "On new compounds of carbon and hydrogen, and on certain other products obtained during the decomposition of oil by heat". Philosophical Transactions of the Royal Society of London. 115: 440–466. doi:10.1098/rstl.1825.0022. In a footnote on page 448, Faraday notes the action of sulfuric acid on coal gas and coal-gas distillate; specifically, "The [sulfuric] acid combines directly with carbon and hydrogen; and I find when [the resulting compound is] united with bases [it] forms a peculiar class of salts, somewhat resembling the sulphovinates [i.e., ethyl sulfates], but still different from them."
  155. ^ Hennell H (1826). "On the mutual action of sulphuric acid and alcohol, with observations on the composition and properties of the resulting compound". Philosophical Transactions of the Royal Society of London. 116: 240–249. doi:10.1098/rstl.1826.0021. S2CID 98278290. On page 248, Hennell mentions that Faraday gave him some sulfuric acid in which coal gas had dissolved and that he (Hennell) found that it contained "sulphovinic acid" (ethyl hydrogen sulfate).
  156. ^ Hennell H (1828). "On the mutual action of sulfuric acid and alcohol, and on the nature of the process by which ether is formed". Philosophical Transactions of the Royal Society of London. 118: 365–371. doi:10.1098/rstl.1828.0021. S2CID 98483646. On page 368, Hennell produces ethanol from "sulfovinic acid" (ethyl hydrogen sulfate).
  157. ^ Sérullas GS (1828). Guyton de Morveau LB, Gay-Lussac JL, Arago F, Michel Eugène Chevreul, Marcellin Berthelot, Éleuthère Élie Nicolas Mascart, Albin Haller (eds.). "De l'action de l'acide sulfurique sur l'alcool, et des produits qui en résultent". Annales de Chimie et de Physique. 39: 152–186. On page 158, Sérullas mentions the production of alcohol from "sulfate acid d'hydrogène carboné" (hydrocarbon acid sulfate).
  158. ^ In 1855, the French chemist Marcellin Berthelot confirmed Faraday's discovery by preparing ethanol from pure ethylene. Berthelot M (1855). Arago F, Gay-Lussac JL (eds.). "Sur la formation de l'alcool au moyen du bicarbure d'hydrogène (On the formation of alcohol by means of ethylene)". Annales de Chimie et de Physique. 43: 385–405. (Note: The chemical formulas in Berthelot's paper are wrong because chemists at that time used the wrong atomic masses for the elements; e.g., carbon (6 instead of 12), oxygen (8 instead of 16), etc.)
  159. ^ Siegel R (15 February 2007). "Ethanol, Once Bypassed, Now Surging Ahead". NPR. Retrieved 22 September 2007.
  160. ^ DiPardo J. "Outlook for Biomass Ethanol Production and Demand" (PDF). United States Department of Energy. Archived from the original (PDF) on 24 September 2015. Retrieved 22 September 2007.
  161. ^ Myers RL, Myers RL (2007). The 100 most important chemical compounds: a reference guide. Westport, CN: Greenwood Press. p. 122. ISBN 978-0-313-33758-1.

Further reading

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