PROCESS FOR PREPARING CAPROLACTAM Russian patent published in 1999 - IPC

FIELD: organic chemistry. SUBSTANCE: claimed process comprises preparing caprolactam by cyclohexanone oxime Beckman regrouping with oleum in the presence of aliphatic and/or cycloaliphatic C₁-C₂₀ carboxylic acid, preferably C₁-C₁₀ acid, and more preferably cyclohexanecarboxylic acid, at 20-150 C. Cyclohexanecarboxylic acid and oleum are components of acidic reaction mixture resulting from reaction of lactamization of cyclohexanecarboxylic acid with nitrosonium hydrosulphide. EFFECT: increased yield of the final product. 8 cl