发明授权
- 专利标题: Process for continuous preparation of diester of oxalic acid
- 专利标题(中): 连续制备草酸二酯的方法
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申请号: US495460申请日: 1983-05-19
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公开(公告)号: US4467109A公开(公告)日: 1984-08-21
- 发明人: Susumu Tahara , Kozo Fujii , Keigo Nishihira , Masaoki Matsuda , Katsuhiko Mizutare
- 申请人: Susumu Tahara , Kozo Fujii , Keigo Nishihira , Masaoki Matsuda , Katsuhiko Mizutare
- 申请人地址: JPX Ube
- 专利权人: Ube Industries, Ltd.
- 当前专利权人: Ube Industries, Ltd.
- 当前专利权人地址: JPX Ube
- 优先权: JPX118343 19800829
- 主分类号: C07C69/36
- IPC分类号: C07C69/36 ; C07C69/34
摘要:
There is provided a process for the continuous preparation of a diester of oxalic acid, which comprises a first step of reacting carbon monoxide with an ester of nitrous acid in the gaseous phase; a second step of condensing the gaseous reaction mixture to separate a non-condensed gas from a condensed liquid containing the diester of oxalic acid; a third step of introducing the non-condensed gas of the second step to a regeneration column, thereby contacting it with a gas containing molecular oxygen and an alcohol, and recycling the resulting gas containing an ester of nitrous acid to the reactor of the first step; a fourth step of distilling out an alcohol containing a diester of carbonic acid formed as a by-product of the first step and obtaining a liquid diester of oxalic acid; and a fifth step of introducing the distillate of the fourth step to a hydrolysis column thereby hydrolyzing the diester of carbonic acid in the gas and recycling the alcohol as an alcohol source for the third step.