Mei & Mark LLP
System and method for continuously producing polyoxymethylene dialkyl ethers
A reaction system and method for producing polyoxymethylene dialkyl ethers (RO(CH2O)nR, n=1-8) by continuous acetalation of formaldehyde and aliphatic alcohol in the presence of an acid ionic liquid catalyst. The reaction system includes an acetalation reaction unit, a product separation unit, and a catalyst regeneration unit. The recyclable material and catalyst are separated by combining extraction and rectification, and a recovery rate of more than 99% for the catalyst is achieved. Water, as the byproduct, is separated from the reaction system by destroying the azeotrope of water, alcohol, aldehyde, and RO(CH2O)nR, so that the product separation and catalyst regeneration are facilitated and the catalytic cycle is achieved.
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences
C C C B Y B C B
C07C C07C C07C B01J Y02P B01J C07C B01J
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Chungu Ronghua Meirong Jing Heyuan
Xia Jin Kang Chen Song