Process of separating citric acid and/or isocitric acid or their

Details Process of separating citric acid and/or isocitric acid or their Process of separating citric acid and/or isocitric acid or their

1975-10-23

1978-02-21

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210500M, B01D 1300

Patent

active

040750930

ABSTRACT:
The process of separating citric acid and/or isocitric acid and their salts from aqueous solutions containing said acids or their salts, and especially from fermentation solutions, consists in contacting said solutions under pressure with a permselective membrane. The material composing said membrane has introduced thereinto acid or basic groups so as to yield membranes of predetermined swelling power. Preferred membranes are those consisting of polyimide or polyamide polycondensation products which are modified by acid or basic groups, of polysulfones modified by acid groups, or of vinyl polymers modified by acid or basic groups. Adjustment of the starting solutions to a pH lower than 3.0 is advantageously effected by means of polyvinylsulfonic acid.

REFERENCES:
patent: 3004904 (1961-10-01), Gregor et al.
patent: 3228876 (1966-01-01), Mahon
patent: 3228877 (1966-01-01), Mahon
patent: 3342729 (1967-09-01), Strand
patent: 3544455 (1970-12-01), Adams et al.
patent: 3673084 (1972-06-01), King et al.
patent: 3723309 (1973-03-01), Bridgeford
patent: 3750735 (1973-08-01), Chiang et al.

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