关键词: 氨肟化, TS-1分子筛, 环己酮肟, 环己烷, 三相体系

Abstract: An innovative green process of producing ε-caprolactam was proposed by integrating ammoximation and Beckmann rearrangement effectively. As a first part of the new process, TS-1-catalyzed synthesis of cyclohexanone oxime from cyclohexanone by ammoximation with ammonia and hydrogen peroxide was carried out in a batch plant. Cyclohexane was used as the solvent to introduce a three-phase reaction system. The influences of essential process parameters on ammoximation in the three-phase system were investigated. With high conversion of cyclohexanone and selectivity to oxime (both > 99%) under optimum conditions, the three-phase ammoximation process showed an equal catalytic activity for TS-1 but much more convenient and simpler for the separation of catalyst in comparison to the industrial two-phase system where t-butanol was used as solvent.