Separation and concentration of lower alcohols from dilute aqueo

Details Separation and concentration of lower alcohols from dilute aqueo Separation and concentration of lower alcohols from dilute aqueo

1990-01-24

1991-07-02

Medley, Margaret B.

Fuel and related compositions

Liquid fuels

Organic oxygen compound containing

62536, 203 14, 203 48, 203 57, C10L 102

Patent

active

050282409

ABSTRACT:
A process for producing, from a dilute aqueous solution of a lower (C.sub.1 -C.sub.5) alcohol, a concentrated liquid solution of the alcohol in an aromatic organic solvent is disclosed. Most of the water is removed from the dilute aqueous solution of alcohol by chilling sufficiently to form ice crystals. Simultaneously, the remaining liquid is extracted at substantially the same low temperature with a liquid organic solvent that is substantially immiscible in aqueous liquids and has an affinity for the alcohol at that temperature, causing the alcohol to transfer to the organic phase. After separating the organic liquid from the ice crystals, the organic liquid can be distilled to enrich the concentration of alcohol therein. Ethanol so separated from water and concentrated in an organic solvent such as toluene is useful as an anti-knock additive for gasoline.

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Chowdhury, J., "CPI Warm Up to Freeze Concentration," Chem. Eng., Apr. 25, 1988, pp. 24-31.

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