Patent ID: 9242931
Filing Date: 2016-01-26
CPC Classification: C07D

Claim Text:
1. A process for producing laurolactam comprising impurities having a cyclic bridge structure in 50 ppm by weight or less by Beckmann rearrangement of a cyclododecanone oxime, wherein impurities having a cyclic bridge structure in a Beckmann rearrangement reaction solution are contained in 300 ppm by weight or less based on a laurolactam as a desired product, wherein the cyclododecanone oxime is produced by reacting cyclododecanone with hydroxylamine, and wherein the cyclododecanone is produced from an addition reaction product of butadiene and purified by recrystallization, and wherein a ketone having a cyclic bridge structure is contained in the cyclododecanone in 500 ppm by weight or less.