Patent ID: 8344183

Claim:
A method for synthesizing polyoxymethylene dimethyl ethers by ionic liquid catalysis, characterized in that the method comprises synthesizing polyoxymethylene dimethyl ethers by using a functional acidic ionic liquid as catalyst and using methylal and trioxymethylene as reactants under nitrogen gas atmosphere with a reaction temperature of 95-130° C., a reaction pressure of 0.8-4.0 MPa and a reaction time of 0.5-1 h, wherein the functional acidic ionic liquid has a cation moiety selected from the group consisting of 1-(4-sulfobutyl)-3-methylimidazolium or 1-(methyl 4- butyl-1-sulfonate)-3-methylimidazolium, and an anion moiety selected from the group consisting of hydrosulfate and monomethyl sulfate.