Method for preparing methyl-ethyl ketone

The invention belongs to the chemical technology field, and discloses a method for preparing methyl ethyl ketone. The methyl ethyl ketone is prepared from 2,3-butanediol by dehydrating in the presence of ZSM-5 or NaY molecular sieve catalyst. Under process conditions, the catalyst is not easily deactivated and has good stability. The method has the advantages of high substrate conversion and product yield, simple process, low production cost and less environmental pollution, and can satisfy industrial requirement. With the method, the conversion rate of 2,3-butanediol is 90.5%-100%, and the selectivity of methyl ethyl ketone is 83.7%-91.3%.