Title:
【発明の名称】不飽和ジカルボン酸無水物のジメチルエステルを生成する方法
Document Type and Number:
Japanese Patent JP2002511081
Kind Code:
A
Abstract:
An improved process for the production of high quality unsaturated dimethylesters by reacting dicarboxylic anhydrides, typically maleic anhydride or phthalic anhydride, with methanol. The process is characterized by the fact that the esterification is performed in two steps, the step 1 consisting in a non catalytic reaction of formation of monomethylesters, and the step 2 consisting in the catalytic reaction of formation of dimethylesters from the monomethylester, the said catalytic reaction taking place in a reactor consisting of a multi-tray column where the liquid phase containing the mono and diester mixture flows downwards from each tray coming to contact with a progressively drier upflowing stream of vapors in countercurrent, which continuously removes the water formed in the reaction from the liquid phase. The process uses an alkylbenzene sulfonic acid with an alkyl radical containing from 10 to 13 carbon atoms as esterification catalyst.
Inventors:
Obe miriam
Bertola Aldo
Bertola Aldo
Application Number:
JP50362599A
Publication Date:
April 09, 2002
Filing Date:
December 02, 1997
Export Citation:
Assignee:
Pantokim S.A.
International Classes:
C07B61/00; C07C67/08; C07C69/60; C07C69/80; (IPC1-7): C07C67/08; C07C69/60; C07C69/80
Attorney, Agent or Firm:
Rikichi Ichikawa (1 outside)