04422903 is referenced by 112 patents and cites 15 patents.

An improved distillation method and apparatus are provided for recovering anhydrous ethanol from fermentation or synthetic feedstocks. The system includes at least one stripper-rectifier tower, a dehydrating tower, and an azeotropic agent stripping tower. Substantial energy savings are realized by operating the dehydrating tower, and preferably also the azeotropic agent stripping tower, at a higher pressure than the stripper-rectifier tower and by condensing the overhead vapors from the dehydrating tower (or dehydrating tower and azeotropic agent stripping tower) to provide the heat required in the stripper-rectifier tower. In a preferred embodiment, two stripper-rectifier towers are used, one operating at a higher pressure than the other, in which case the higher pressure tower is heated as just described and the overhead vapors from the higher pressure tower are condensed to supply the heat required in the lower pressure tower. Further energy savings are accomplished by preheating the feedstock by means of the heat contained in the stripper-rectifier tower overhead (the lower pressure stripper-rectifier tower in the case where two such towers are used) and also by the heat contained in the stripper-rectifier bottoms.

Title
Anhydrous ethanol distillation method and apparatus
Application Number
6/234771
Publication Number
4422903
Application Date
February 17, 1981
Publication Date
December 27, 1983
Inventor
George D Moon Jr
Cincinnati
OH, US
William R Ackley
Cincinnati
OH, US
John R Messick
Cincinnati
OH, US
Agent
Merriam Marshall & Bicknell
Assignee
Raphael Katzen Associates International
OH, US
IPC
C07C 29/80
C07C 31/08
B01D 3/36
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