Isolation of carboxylic acids from their aqueous solutions

Details Isolation of carboxylic acids from their aqueous solutions Isolation of carboxylic acids from their aqueous solutions

C - Chemistry, Metallurgy

07

C

260/532.5, 260/5

C07C 53/00 (2006.01) C07C 51/48 (2006.01) C07C 57/04 (2006.01)

Patent

CA 1065889

ABSTRACT OF THE DISCLOSURE: Carboxylic acids of the ge- neral formula I R1 - COOH where R1 is hydrogen, methyl, ethyl or vinyl, are isolated from their dilute aqueous solutions by extraction followed by distillation of the mixtures obtained, the extractant used being a secondary amide of the general formula II Image II where R2 and R3 are alkyl, cycloalkyl, aryl or aralkyl or con- jointly are 1,4- or 1,5-alkylene, in each case of not more than 8 carbon atoms, with the proviso that the sum of the carbon atoms of R2 and R3 is from 7 to 14 and that only one of these radicals is aryl, and where R4 is one of the radicals R1.

262961

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