PROCESS FOR PREPARING METHYL ACETATE

摘要

Provided in the present invention is a process for preparing methyl acetate through carbonylation of dimethyl ether, comprising: passing a feed gas containing dimethyl ether, carbon monoxide, and optional hydrogen gas through a reactor loaded with a mordenite molecular sieve catalyst, and preparing methyl acetate by reacting same at a reaction temperature of 19 to 320°C, a reaction pressure of 0.5 to 20.0 Mpa, and a gas volume space velocity of 500 to 5000 h-1; wherein the mordenite molecular sieve catalyst is a hydrogen-type mordenite molecular sieve catalyst with an adsorbed organic amine, the molar ratio of the dimethyl ether to carbon monoxide in the feed gas is DME/CO = 1/1 to 1/15, the molar ratio of the hydrogen gas to carbon monoxide is H2/CO = 0 to 10/1, and the dimethyl ether in the feed gas is charged into the reactor by means of feeding in stages. The present invention is characterized in that: through treatment by organic amine adsorption, the temperature distribution of catalyst bed can be effectively controlled so as to avoid the occurrence of hot points, and thereby side reactions are reduced, the selectivity of target product is improved, and the lifetime of the catalyst is greatly extended.