US 7,560,599 B2
	Method for preparing polymethoxymethylal
Jing Chen, Lanzhou (China); Zhonghua Tang, Lanzhou (China); Chungu Xia, Lanzhou (China); Xinzhi Zhang, Lanzhou (China); and Zhen Li, Lanzhou (China)
Assigned to Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou Gansu (China)
Filed on Jul. 28, 2008, as Appl. No. 12/180,594.
Claims priority of application No. 2007 1 0018474 (CN), filed on Jul. 31, 2007.
Prior Publication US 2009/0036715 A1, Feb. 05, 2009
Int. Cl. C07C 43/30 (2006.01); C07C 43/303 (2006.01)

U.S. Cl. 568—594  [568/613; 568/618]

11 Claims

1. A method for preparing polymethoxymethylal, characterized in that: preparing polymethoxymethylal by a catalytic reaction using methanol and trioxymethylene as reactants and using an ionic liquid as catalyst with a controlled reaction temperature of 333˜413K and a reaction pressure of 0.5 MPa˜4 MPa; wherein, the cation portion of the ionic liquid is one selected from the group consisting of imidazolium cation, pyridinium cation, quaternary ammonium cation and quaternary phosphonium cation, and the anion portion is one selected from the group consisting of p-toluenesulfonate, trifluoromethylsulfonate, methylsulfonate, bisulfate and trifluoroacetate.