Removal of organic acids from dilute aqueous solutions of salts

Details Removal of organic acids from dilute aqueous solutions of salts Removal of organic acids from dilute aqueous solutions of salts

1979-10-09

1981-02-10

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562494, 562580, 562593, 562600, 562606, 562608, C07C 5142, C07C 5300

Patent

active

042503310

ABSTRACT:
Process for recovering carboxylic acids from dilute aqueous solutions of alkali metal salts of such carboxylic acids by mixing such solutions with from 10 to 1000% of a supercritical solution comprising at least 10 mole % carbon dioxide at a pressure from 80 to 500 atm and preferably 100 to 350 atm and at a temperature of from 35.degree. to 200.degree. C. and preferably from 35.degree. to 100.degree. C. whereby the salt reacts with the carbon dioxide to form the carboxylic acid which dissolves in the supercritical fluid. The aqueous phase is allowed to separate from the supercritical fluid phase. The pressure of the supercritical phase is lowered which lowers the solubility of the carboxylic acid in the supercritical fluid so that an acid phase is formed separate from the supercritical fluid phase whereby recovery of the acid is effected.

REFERENCES:
patent: 3969196 (1976-07-01), Zosel
patent: 4061566 (1977-12-01), Modell

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