Process for the manufacture of isopropenyl acetate

摘要

A continuous process for the preparation of isopropenyl acetate from acetone and ketene comprises continuously dissolving ketene gas in acetone containing an acidic catalyst under conditions of turbulent flow at elevated pressure and a temperature of from 20-100 DEG C., and in a separate step, reacting the components by continuously passing the solution through an extended reaction zone in laminar liquid flow under elevated pressure and a temperature of at least 50 DEG C. Gas containing less than 10% ketene by volume may be used and the acidic catalyst may be sulphuric acid, which may be removed after reaction by treatment with a non-aqueous base such as b -picoline, g -picoline and aldehydine. Apparatus and reactors are described. Specification 788,596 is referred to.