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Talk:Ethyl tert-butyl ether

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Context of biofuels

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Ethanol is also increasingly used as an oxygenate additive for standard petrol, as a replacement for methyl tertiary butyl ether (MTBE). MTBE is usually mixed with petrol as an additive to improve the octane number. Because MTBE has toxic properties and is responsible for considerable groundwater and soil contamination, MTBE is more and more frequently replaced by ETBE (ethyl tertiary butyl ether). ETBE is produced from bioethanol and may be mixed in maximum quantities of 15 percent with petrol.
Nevertheless, some results (WWI 2006 p. 153) point out that using ethanol to make ETBE results in even greater GHG savings than blending ethanol directly with gasoline. This is because ETBE replaces MTBE, which has relatively high energy demand, whereas ethanol replaces gasoline, which requires less energy for production than does MTBE.

GHG = green house gas

WWI = Worldwatch Institute 2006: Biofuels for Transportation, Global Potential and Implications for Sustainable Agriculture and Energy in the 21st Century.

This makes ETBE a relatively important subtopic concerning the near term prospects for biofuels. MaxEnt 06:52, 15 June 2007 (UTC)[reply]

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