Process for separating ethanol from aqueous solution

Details Process for separating ethanol from aqueous solution Process for separating ethanol from aqueous solution

1992-02-20

1992-11-03

Dawson, Robert A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210651, 210652, 426 14, B01D 1100, B01D 6100

Patent

active

051600447

ABSTRACT:
The present invention provides a process for separating ethanol from an aqueous solution by supercritical or near supercritical extraction in combination with reverse osmosis, which includes contacting an ethanol containing aqueous solution with one side of a reverse osmosis membrane in the presence of a supercritical or near supercritical CO.sub.2 having a pressure of 72.8-88.4 atm and a temperature of 26.5.degree.-34.degree. C., wherein the volumetric ratio of the supercritical or near supercritical CO.sub.2 to the ethanol containing aqueous solution is higher than 1.8, and recovering a permeate solution having a lower ethanol concentration from the opposite side of the membrane.

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