Talk:Propylene glycol methyl ether acetate
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Vapor pressure
[edit]I created this page because finding the vapor pressure for PGMEA was quite difficult and nobody seems to have tabulated it. When I finally foudn the Antoine Coefficients in the Shell Datasheet, I figured I'd create a stub for the page and add the graph I generated.
Ckelloug (talk) 21:07, 1 August 2014 (UTC)
- This information, which is WP:Original research and generally not permitted in Wikipedia articles has been contested. I have removed the following text from the article. -- Ed (Edgar181) 22:19, 30 March 2018 (UTC)
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Please note that the data page on the Shell Chemicals website referenced below gives the boiling point of propylene glycol methyl ether acetate as 120°C. On the Dow Chemical 'Dowanol PMA' datasheet, the boiling point at 1010 mbar is given as 146°C. Both of these pieces of information are at variance with the vapour pressure versus temperature curve published on this page that indicates that the vapour pressure of propylene glycol methyl ether acetate is HIGHER than that of water when calculated using the Antoine Equation, whereas the boiling point information provided by both Shell Chemical and Dow Chemical imply that it should be considerably LOWER than the vapour pressure of water. The Dow Chemical data sheet (https://www.dow.com/assets/attachments/business/pcm/dowanol/dowanol_pma/tds/dowanol_pma.pdf accessed on 16th January 2018) also lists the extrapolated vapour pressure for propylene glycol methyl ether acetate at 20°C as 3.7 mbar whereas the published plot below indicates a value around 300 mbar. Clearly these discrepancies need the attention of someone who has detailed knowledge of the compound and its physical properties. In addition, the label of the vertical axis on the vapour pressure versus temperature graph should read 'Millibars' and not 'Log10(Millibars). The scale is logarithmic, however the values for the vapour pressures shown are in millibars, not the logarithms (base 10) of the vapour pressure values.  |