Process for the preparation of percarboxylic acid solutions

C - Chemistry – Metallurgy – 07 – C

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202/58, 260/506.

C07C 407/00 (2006.01) C07C 409/24 (2006.01) C07C 409/26 (2006.01)

Patent

CA 1145356

PROCESS FOR THE PREPARATION OF PERCARBOXYLIC ACID SOLUTIONS ABSTRACT OF THE DISCLOSURE In a process for the continuous preparation of pure organic solutions of percarboxylic acids having 2 to 5 carbon atoms, by a) contacting aqueous hydrogen peroxide with a carboxylic ad d contain- ing 2 to 5 carbon atoms in the presence of an acid catalyst at a feed molar ratio of H2O2 to carboxylic acid of 0.5 : 1 to 30 :1, b) isolating an extract essentially containing the percarboxylic acid and possibly the corresponding carboxylic acid not converted in stage (a), by extracting the reaction mixture obtained according to stage (a) with an organic solvent, c) treating the extract with water or an aqueous solution in an extrac- tion unit provided with one to ten theoretical separation stages and d) dehydrating the solution of the percarboxylic acid and organic sol- vent obtained according to (c), by azeotropic distillation, the improvement wherein the organic phase of the top product of the azeotropic distillation, obtained during the dehydration according to (d), is entirely or partially recycled to stage (c) and/or entirely or partially recycled to stage (b).

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