Process for separating 11-cyanoundecanoic acid,...

Details Process for separating 11-cyanoundecanoic acid,... Process for separating 11-cyanoundecanoic acid,...

C - Chemistry, Metallurgy

07

D

260/534.1, 260/2

C07D 223/10 (2006.01) C07C 45/78 (2006.01) C07C 45/80 (2006.01) C07C 45/82 (2006.01) C07D 201/16 (2006.01)

Patent

CA 1107731

ABSTRACT OF THE DISCLOSURE Disclosed is a process for separating 11-cyanoundecanoic bcid, cyclohexanone and .epsilon.-caprolactam from a pyrolysis product obtained by pyrolyzing 1,1'-peroxydicyclohexylamine in the presence of steam at a temperature of 300° to 1,000°C. The pyrolysis product is first contacted with a mixture comprised of aqueous ammonia and at least one organic solvent selected from benzene, toluene and xylene, and the so prepared liquid is separated into the oily layer and the aqueous layer. On one hand, the oily layer is distilled to separate cyclohexanone therefrom. On the other hand, the aqueous layer is acidified to a pH of below 4.0 by adding thereto a mineral acid and maintained at a temperature of 40° to 100°C to separate crude 11-cyanoundecanoic acid in molten form from the aqueous layer, and then, the separated crude molten 11-cyanoundecanoic acid is washed with hot water to extract .epsilon.-caprolactam therefrom. - 1 -

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