Abstract: The invention relates to a reaction system and process for continuously preparing polymethoxy dimethyl ether (DMM3-8) by a continuous acetalization reaction between an aqueous formaldehyde solution or paraformaldehyde and methanol in the presence of a functionalized acidic ionic liquid as a catalyst. The reaction system of the invention preferably comprises a formaldehyde-concentrating unit, a vacuum-drying unit, an acetalization reaction unit, a product-separating unit and a catalyst-regenerating unit. The process of the invention uses aqueous formaldehyde solution as an initial raw material, which is concentrated in the formaldehyde-concentrating unit to a concentrated formaldehyde of 50˜80 wt. %, and vacuum-dried to paraformaldehyde, or uses paraformaldehyde as raw material directly, then obtains DMM3-8 by an acetalization reaction.
Type:
Grant
Filed:
March 18, 2014
Date of Patent:
October 27, 2015
Assignees:
Suzhou OST Advanced Materials Co., Ltd., Lanzhou Institute of Chemical Physics, Chinese Academy Of Sciences
Inventors:
Jing Chen, Heyuan Song, Chungu Xia, Meirong Kang
Abstract: The invention relates to a reaction system and process for continuously preparing polymethoxy dimethyl ether (DMM3-8) by a continuous acetalization reaction between an aqueous formaldehyde solution or paraformaldehyde and methanol in the presence of a functionalized acidic ionic liquid as a catalyst. The reaction system of the invention preferably comprises a formaldehyde-concentrating unit, a vacuum-drying unit, an acetalization reaction unit, a product-separating unit and a catalyst-regenerating unit. The process of the invention uses aqueous formaldehyde solution as an initial raw material, which is concentrated in the formaldehyde-concentrating unit to a concentrated formaldehyde of 50˜80 wt. %, and vacuum-dried to paraformaldehyde, or uses paraformaldehyde as raw material directly, then obtains DMM3-8 by an acetalization reaction.
Type:
Application
Filed:
March 18, 2014
Publication date:
April 2, 2015
Applicants:
Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Suzhou OST Advanced Materials Co., Ltd.
Inventors:
Jing Chen, Heyuan Song, Chungu Xia, Meirong Kang