Isolation of hydroxy carboxylic acids from aqueous solutions

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

C - Chemistry, Metallurgy

07

C

C07C 59/01 (2006.01) C07C 51/44 (2006.01) C07C 51/48 (2006.01) C07C 59/245 (2006.01) C07C 59/50 (2006.01) C07C 227/40 (2006.01) C07C 229/22 (2006.01) C07C 229/36 (2006.01)

Patent

CA 2179768

The present invention relates to a process for isolating hydroxy carboxylic acids by extraction from their dilute aqueous solutions and subsequent distillation of the extracts obtained in this way, wherein the extractant used is a secondary amide of the general formula I Image I where R1 is hydrogen, alkyl, cycloalkyl, aryl, aralkyl or hydroxyalkyl groups and R2 and R3 are, independently of one another, alkyl, cycloalkyl, aryl, aralkyl or hydroxyalkyl groups, with the proviso that the total of the carbon atoms in R1, R2 and R3 is from 7 to 14.

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