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公开(公告)号：US10596539B2
公开(公告)日：2020-03-24
申请号：US16095065
申请日：2017-04-13
申请人： Evonik Roehm GmbH
摘要： A process for performing a heterogeneously catalysed reaction in a three-phase reactor, where there is at least one liquid phase, at least one gaseous phase and at least one solid phase in the reactor and the reactor has at least two zones, with the reaction mixture being conveyed downward in zone 1, the reaction mixture being conveyed upward in zone 2, zones 1 and 2 being separated from one another by a dividing wall, and in that the ratio between the average catalyst concentrations in zone 2 and in zone 1 is greater than 2.
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公开(公告)号：US20190084914A1
公开(公告)日：2019-03-21
申请号：US16134569
申请日：2018-09-18
申请人： Evonik Roehm GmbH
发明人： Steffen Krill , Marcel Treskow
IPC分类号： C07C67/44 , C07C69/54 , B01J23/80 , B01J23/52 , B01J21/06 , B01J21/08 , B01J21/04 , B01J35/10 , B01J35/02
摘要： The present invention relates to a novel process for oxidative esterification, generally for reaction of aldehydes with alcohols in the presence of oxygenous gases directly to give the corresponding ester in the presence of a heterogeneous catalyst, by means of which, for example, (meth)acrolein can be converted to methyl (meth)acrylate. The new catalyst has titanium dioxide as the main component of the support material. The catalysts are especially notable for high mechanical and chemical stability and for good catalytic performance even over very long periods. The process is an improvement in the catalyst service life, activity and selectivity over prior art catalysts which lose activity and/or selectivity relatively quickly in continuous operation in media having even a small water content.
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公开(公告)号：US10457626B2
公开(公告)日：2019-10-29
申请号：US16161378
申请日：2018-10-16
申请人： Evonik Roehm GmbH
发明人： Steffen Krill , Torsten Balduf , Martin Koestner , Matthias Groemping , Alexander Lygin , Rudolf Burghardt
摘要： The present invention relates to a process for producing methyl methacrylate, comprising the following steps: A) producing methacrolein and B) reacting the methacrolein obtained in step A) in an oxidative esterification reaction to give methyl methacrylate, characterized in that the two steps A) and B) take place in a liquid phase at a pressure of from 2 to 100 bar, and step B) is carried out in the presence of a heterogeneous noble-metal-containing catalyst comprising metals and/or comprising metal oxides.
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公开(公告)号：US10301251B2
公开(公告)日：2019-05-28
申请号：US15760030
申请日：2016-09-14
申请人： Evonik Roehm GmbH
摘要： The present invention relates to a process for preparing methyl methacrylate by direct oxidative esterification of methacrolein. Methyl methacrylate is used in large amounts for preparing polymers and copolymers with other polymerizable compounds. In addition, methyl methacrylate is an important synthesis unit for a variety of specialty esters based on methacrylic acid (MAA) which can be prepared by transesterification with the appropriate alcohol. There is consequently a great interest in very simple, economic and environmentally friendly processes for preparing this starting material.In particular the present invention relates to an optimized workup of the reactor effluent from the oxidative esterification of methacrolein by means of which process waste streams can be minimized and process water can be recycled in optimal fashion. The methacrylic acid generated in the process is also optimally recovered and isolated or converted into the commodity alkyl methacrylate. This process moreover has the advantage that fewer demands than described in the prior art are placed on plant apparatus configuration.
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公开(公告)号：US10273201B2
公开(公告)日：2019-04-30
申请号：US15795887
申请日：2017-10-27
申请人： Evonik Roehm GmbH
发明人： Steffen Krill , Torsten Balduf , Martin Koestner , Matthias Groemping , Alexander Lygin , Rudolf Burghardt
摘要： The present invention relates to a process for producing methyl methacrylate, comprising the following steps: A) producing methacrolein and B) reacting the methacrolein obtained in step A) in an oxidative esterification reaction to give methyl methacrylate, characterized in that the two steps A) and B) take place in a liquid phase at a pressure of from 2 to 100 bar, and step B) is carried out in the presence of a heterogeneous noble-metal-containing catalyst comprising metals and/or comprising metal oxides.
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6.发明授权公开(公告)号：US10160713B2
公开(公告)日：2018-12-25
申请号：US15316685
申请日：2015-06-24
申请人： EVONIK ROEHM GmbH
IPC分类号： C07C57/04 , C07C51/377
摘要： The present invention describes a process for dehydrating alpha-substituted carboxylic acids in the presence of water at high pressures while avoiding by-products.
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公开(公告)号：US20180334423A1
公开(公告)日：2018-11-22
申请号：US15967463
申请日：2018-04-30
申请人： Evonik Roehm GmbH
IPC分类号： C07C67/44 , C07C69/54 , B01J31/02 , B01J21/04 , B01J21/06 , B01J21/08 , B01J23/04 , B01J23/10 , B01J23/14 , B01J23/18 , B01J23/34 , B01J23/72
CPC分类号： C07C67/44 , B01J21/04 , B01J21/063 , B01J21/066 , B01J21/08 , B01J23/04 , B01J23/10 , B01J23/14 , B01J23/18 , B01J23/34 , B01J23/72 , B01J31/0212 , B01J2531/31 , C07C69/54 , C07C2531/14
摘要： A method can prepare a carboxylic ester. The method includes reacting an aldehyde in the presence of an aluminium alkoxide applied to a support material.
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公开(公告)号：US20180050977A1
公开(公告)日：2018-02-22
申请号：US15795887
申请日：2017-10-27
申请人： Evonik Roehm GmbH
发明人： Steffen Krill , Torsten Balduf , Martin Koestner , Matthias Groemping , Alexander Lygin , Rudolf Burghardt
摘要： The present invention relates to a process for producing methyl methacrylate, comprising the following steps: A) producing methacrolein and B) reacting the methacrolein obtained in step A) in an oxidative esterification reaction to give methyl methacrylate, characterized in that the two steps A) and B) take place in a liquid phase at a pressure of from 2 to 100 bar, and step B) is carried out in the presence of a heterogeneous noble-metal-containing catalyst comprising metals and/or comprising metal oxides.
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公开(公告)号：US09816703B2
公开(公告)日：2017-11-14
申请号：US14904898
申请日：2014-07-15
申请人： EVONIK ROEHM GmbH
发明人： Steffen Krill , Torsten Balduf , Rudolf Burghardt , Gerhard Koelbl , Reed Zhao
摘要： The present invention relates to the oxidative combustion of amine-containing wastewaters, especially in a process for preparing methacrolein. Methacrolein is used in chemical synthesis particularly as an intermediate for preparation of methacrylic acid, methyl methacrylate, or else of active ingredients, odorants or flavorings. More particularly, the present invention relates to an oxidative combustion of the amine-containing wastewaters with only low nitrogen oxide formation.
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10.发明授权公开(公告)号：US09611204B2
公开(公告)日：2017-04-04
申请号：US14904777
申请日：2014-07-15
申请人： EVONIK ROEHM GMBH
CPC分类号： C07C45/75 , C07C45/786 , C07C45/82 , C07C47/22
摘要： The present invention concerns regulating the water content in a process for production of methacrolein. Methacrolein is used in chemical synthesis particularly as an intermediate for production of methacrylic acid, methyl methacrylate or else of active, aroma or flavor chemicals. The present invention is particularly concerned with regulating the water content in a process for production of methacrolein from formaldehyde and propionaldehyde via a Mannich condensation.
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