发明申请
- 专利标题： PROCESS FOR PREPARING UNSATURATED ESTERS PROCEEDING FROM ALDEHYDES BY DIRECT OXIDATIVE ESTERIFICATION
- 专利标题（中）： 通过直接氧化法制备从醛类中得到的不饱和酯的方法
-
申请号： US15030775申请日： 2014-12-05
-
公开(公告)号： US20160251301A1公开(公告)日： 2016-09-01
- 发明人: Steffen KRILL , Alexander LYGIN , Torsten BALDUF , Rudolf BURGHARDT , Andreas TEPPERIS , Matthias GROEMPING
- 申请人： Alexander LYGIN , Steffen KRILL , Torsten BALDUF , Rudolf BURGHARDT , Andreas TEPPERIS , Matthias GRÖMPING
- 申请人地址： DE Darmstadt
- 专利权人： EVONIK ROEHM GMBH
- 当前专利权人： EVONIK ROEHM GMBH
- 当前专利权人地址： DE Darmstadt
- 优先权： EP13198863.6 20131220
- 国际申请： PCT/EP2014/076682 WO 20141205
- 主分类号： C07C67/39
- IPC分类号： C07C67/39 ; B01J23/02 ; B01J35/00 ; B01J23/89
摘要：
The present invention relates to a process for preparing methyl methacrylate by a direct oxidative esterification of methacrolein with oxygen and methanol, which is conducted in the liquid phase at a pressure of 2 to 100 bar with a gold catalyst. According to the invention, the liquid phase is withdrawn continuously from the reactor and optionally enriched with oxygenous gas, the pH, after the withdrawal, is adjusted to a pH between 5 and 9 by means of addition of a basic solution and this liquid phase is conducted back into the reactor again to an extent of at least 50%.
公开/授权文献
信息查询
