Highly efficient synthesis of methyl ethyl ketone oxime through ammoximation over Ti-MOR catalyst

The liquid-phase ammoximation of methyl ethyl ketone(MEK) to methyl ethyl ketone oxime(MEKO) with ammonia and hydrogen peroxide was conducted over MOR-type titanosilicate(Ti-MOR),which was prepared from highly dealuminated mordenite and TiCl4 vapor by a secondary method of gas-solid phase reaction.The effects of reaction parameters on this reaction were studied systematically in a bath-type reactor.Based on the optimized reaction conditions,Ti-MOR was further employed as the catalyst for the ammoximation of MEK to MEKO in a continuous slurry reactor.This catalyst exhibited good catalytic activity and excellent MEKO selectivity in comparison to TS-1.Moreover,in terms of ketone conversion,oxime selectivity,coke resistance,and lifetime,Ti-MOR possessed the same advantages as the Ti-MWW catalyst prepared by structural rearrangement.