Preparation of caprolactam

Details Preparation of caprolactam Preparation of caprolactam

C - Chemistry, Metallurgy

07

D

260/241.7

C07D 223/10 (2006.01) C07D 201/08 (2006.01)

Patent

CA 1272718

Abstract of the Disclosure: .epsilon.-caprolactam is prepared by a process in which a) a 5-formylvalerate is reacted with water in the pres- ence of an acidic agewnt at from 30 to 200°C, b) the 5-formylvaleric acid thus obtained is reacted with excess ammonia and hydrogen in the presence of a hy- drogenation catalyst and of a solvent which is inert under the reaction conditions, at from 50 to 150°C under superatmospheric pressure, and c) after the ammonia has been separated off, the result- ing solution of 6-aminocaproic acid is heated to 150- 370°C and the caprolactam formed is isolated.

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