Patent Number: 6,333,412

Title: Process for the preparation of .epsilon.-caprolactam

Abstract: Process to prepare .epsilon.-caprolactam starting from a starting mixture containing a 6-aminocaproate ester, in which in a first step (1) the 6-aminocaproate ester is converted into 6-aminocaproic acid and 6-aminocaproamide by reaction with water in the presence of ammonia at a temperature of between 50 and 250.degree. C., with a separate or simultaneous removal of alcohol(s), and in a subsequent step (2) the 6-aminocaproic acid and 6-aminocaproamide are cyclizised at an elevated temperature, wherein in step (1) the 6-aminocaproate ester is converted into 6-aminocaproic acid and 6-aminocaproamide in the presence of an amount higher than 2 wt. % and less than or equal to 25 wt. % NH.sub.3 (relative to the total amount of organic compounds, water and ammonia present in step (1)).

Inventors: Guit; Rudolf P. M. (Maastricht, NL), Lane; Samuel L. (Beaumont, TX)

Assignee: DSM N.V.

International Classification: C07D 201/00 (20060101); C07D 201/08 (20060101); C07D 201/08 ()

Expiration Date: 12/25/2018