Liquid co.sub.2/cosolvent extraction

Details Liquid co.sub.2/cosolvent extraction Liquid co.sub.2/cosolvent extraction

B - Operations, Transporting

01

D

252/30, 260/758.

B01D 11/04 (2006.01)

Patent

CA 1238305

ABSTRACT OF THE DISCLOSURE Disclosed are a fluid extractant, and a process and apparatus for using the extractant to separate an organic liquid from an aqueous mixture. The extrac- tant comprises a first fluid solvent which is a gas in its near-critical or supercritical state and a cosolvent. A preferred first fluid solvent is near- critical liquid carbon dioxide. Preferred cosolvents are 2-ethyl hexanol for ethanol extraction, and hexa- noic acid for acetic acid extraction. Organic com- pounds such as monohydric alcohols, monoacids, ketones, ethers, aldehydes and esters can be reco- vered from dilute aqueous solutions more economi- cally than possible by prior art processes of distillation. CSF-66

480084

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