Can anyone give sound technical data as to why azeotropic distillation is
no longer used commercially?
Andy Thomson
As I recall, azeotropic distillation of ethanol uses benzene, or maybe hexane.
Benzene is a big problem with EPA, OSHA, etc., and probably similar groups
in other countries. Hexane shouldn't be any worse than gasoline, but I know
they can't use it for vegetable oil extraction anymore, so it's probably
highly regulated for ethanol as well. Also I suspect the extra distillation
steps (one with the azeotrope-forming compound, and then another to
remove it from the ethanol) are quite energy-intensive compared to the
newer methods.
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