Recovery of carboxylic acids from their salts

Details Recovery of carboxylic acids from their salts Recovery of carboxylic acids from their salts

C - Chemistry, Metallurgy

07

C

C07C 229/16 (2006.01) B01D 61/42 (2006.01) B01D 61/44 (2006.01) C07C 51/02 (2006.01) C07C 227/40 (2006.01) C07C 227/42 (2006.01)

Patent

CA 2138113

A process for recovering saturated aliphatic or cycloaliphatic dicarboxylic acids having from 5 to 10 carbon atoms (I) and poly- basic carboxylic acids of the general formula II Image ( II) where the A groups are each independently of the others a C1- to C4-alkylene group and n is from 1 to 4, by electrodialysis of aqueous solutions of salts or partial salts of these carboxylic acids comprises a) carrying on the electrodialysis until about 90% of the car- boxylic groups are present in free form, b) separating the carboxylic acid from the resulting solution outside the electrodialysis cell as a whole or in part, and c) admixing the remaining solution with fresh salt and recircu- lating it into the electrodialysis stage.

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