公开(公告)号：US09617199B2

公开(公告)日：2017-04-11

申请号：US15030775

申请日：2014-12-05

申请人： Steffen Krill ,  Alexander Lygin ,  Torsten Balduf ,  Rudolf Burghardt ,  Andreas Tepperis ,  Matthias Groemping

发明人： Steffen Krill ,  Alexander Lygin ,  Torsten Balduf ,  Rudolf Burghardt ,  Andreas Tepperis ,  Matthias Groemping

IPC分类号： C07C67/39 ,  B01J23/02 ,  B01J23/89 ,  B01J35/00

CPC分类号： C07C67/39 ,  B01J23/02 ,  B01J23/892 ,  B01J35/0006 ,  B01J35/0013 ,  Y02P20/582 ,  C07C69/54

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 According to the invention, the liquid phase is withdrawn continuously from the reactor and optionally enriched with oxygenous gas, the pH, after the withdrawal, is adjusted to a pH between 5 and 9 by means of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(公告)号：US10232353B2

公开(公告)日：2019-03-19

申请号：US15543291

申请日：2015-12-29

申请人： Alexander Lygin ,  Steffen Krill ,  Matthias Groemping ,  Andreas Tepperis

发明人： Alexander Lygin ,  Steffen Krill ,  Matthias Groemping ,  Andreas Tepperis

IPC分类号： B01J23/02 ,  B01J23/04 ,  B01J23/10 ,  B01J23/14 ,  B01J23/18 ,  B01J23/34 ,  B01J23/52 ,  B01J23/66 ,  B01J23/68 ,  B01J23/89 ,  B01J35/00 ,  B01J35/02 ,  B01J35/08 ,  B01J37/02 ,  B01J37/04 ,  C07C67/39 ,  C07C69/54

摘要： Catalysts for oxidative esterification can be used, for example, for converting (meth)acrolein to methyl (meth)acrylate. The catalysts are especially notable for high mechanical and chemical stability even over very long time periods, including activity and/or selectivity relatively in continuous operation in media having even a small water content.