05035776 is referenced by 133 patents and cites 30 patents.

A thermally-integrated extractive distillation process for recovering anhydrous ethanol from fermentation or synthetic feedstocks has a distillation train of four columns. Two columns are preconcentrators operated in parallel. The remaining columns are an extractive distillation dehydrating tower, and an entrainer-recovery column. The two preconcentrators and the dehydrating tower are operated at three successively increasing pressures so that the condensing vapors of the overhead product of the dehydrating tower supply the necessary heat to the reboiler of the intermediate-pressure preconcentrator. The overhead vapors of this preconcentrator are, in turn, used to supply the required heat to the reboiler of the lowest-pressure preconcentrator. The bottom product from each preconcentrator is used to preheat the dilute feed. Additional energy savings are accomplished by the appropriate heat exchange between the various feeds, overheads, and bottoms.

Title
Low energy extractive distillation process for producing anhydrous ethanol
Application Number
7/502112
Publication Number
5035776
Application Date
March 29, 1990
Publication Date
July 30, 1991
Inventor
Jeffrey P Knapp
Newark
DE, US
Agent
Welsh & Katz
Assignee
University of Massachusetts
MA, US
IPC
B01D 3/40
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