Patent ID: 8530645

Claim:
A process for producing laurolactam by Beckmann rearrangement of cyclododecanone oxime using thionyl chloride as a rearrangement catalyst, the process comprising: a pre-preparation step in which thionyl chloride and a part of cyclododecanone oxime are mixed, wherein a molar ratio of the cyclododecanone oxime to thionyl chloride (cyclododecanone oxime thionyl chloride) is 0.5 or more and 10.0 or less, and reacted at a temperature within a range that the reaction system is not solidified and 50° C. or less; and a rearrangement reaction step in which the remaining cyclododecanone oxime and the reactant in the pre-preparation step are mixed, and the cyclododecanone oxime is rearranged at 60° C. to 160° C.