Patent ID: 7091381
Filing Date: 2006-08-15
Classification: C07C

Abstract:
1. A method for producing cyclohexanone oxime, which comprises the steps of: (1) subjecting to an amination reaction a starting material selected from the group consisting of cyclohexanol, cyclohexanone and a mixture thereof, thereby obtaining cyclohexylamine, wherein said cyclohexanol is produced by a process comprising (i) subjecting benzene to partial hydrogenation to obtain a cyclohexene, and (ii) subjecting the obtained cyclohexene to hydration, and wherein said cyclohexanone is produced by a process comprising (i) subjecting benzene to partial hydrogenation to obtain cyclohexene, (ii) subjecting the obtained cyclohexene to hydration to obtain cyclohexanol, and (iii) subjecting the obtained cyclohexanol to dehydrogenation, and (2) subjecting the obtained cyclohexylamine to a partial oxidation reaction in the presence of molecular oxygen as an oxidizing agent, thereby obtaining cyclohexanone oxime, wherein at least one by-product selected from the group consisting of a by-product (α) formed in said step (1) and a by-product (β) formed in said step (2) is recycled to a reaction system of the amination reaction in said step (1).