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公开(公告)号：US09963417B2
公开(公告)日：2018-05-08
申请号：US15037212
申请日：2014-12-11
CPC分类号： C07C67/39 , B01J23/892 , C07C45/75 , Y02P20/582 , C07C69/54
摘要： The present invention relates to a catalytic continuous process for producing methyl methacrylate, said process comprising the step of reacting methacrolein with oxygen and methanol in the presence of a heterogeneous noble-metal-containing catalyst in an oxidative esterification reaction to give methyl methacrylate, characterized in that the stationary concentration of the starting material methacrolein is equal to or less than 12% by weight based on the total weight of the reaction mixture in the reactor, and the ratio F between the total liquid volume within the reactor expressed in liters divided by the total weight of catalyst in the reactor expressed in kilograms is equal to or less than 4.
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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
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 According to the invention, the liquid phase is withdrawn continuously from the reactor and optionally enriched with oxygenous gas, the pH, after the withdrawal, is adjusted to a pH between 5 and 9 by means of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%.
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公开(公告)号：US09890105B2
公开(公告)日：2018-02-13
申请号：US14784320
申请日：2014-04-11
申请人： Steffen Krill , Torsten Balduf , Martin Koestner , Matthias Groemping , Alexander Lygin , Rudolf Burghardt
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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4.发明授权Method for producing methacrolein and the conditioning/draining thereof for direct oxidative esterification 有权甲基丙烯醛的制备方法及其直接氧化酯化的调理/排水公开(公告)号：US09580374B2
公开(公告)日：2017-02-28
申请号：US14916440
申请日：2014-08-27
CPC分类号： C07C45/75 , C07C45/80 , C07C45/82 , C07C45/84 , C07C67/39 , C07C67/54 , C07C69/54 , C07C47/22
摘要： The present invention relates to a process for preparing methyl methacrylate by direct oxidative esterification of methacrolein and the preparation of methacrolein. It is a feature of this novel process that it was possible to distinctly increase the yield and the efficiency of the process compared to the prior art through a sequence of different distillation steps.
摘要翻译： 本发明涉及通过甲基丙烯醛的直接氧化酯化和甲基丙烯醛的制备来制备甲基丙烯酸甲酯的方法。 这种新方法的一个特征是，通过不同蒸馏步骤的顺序，与现有技术相比，有可能明显提高该方法的产率和效率。
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5.发明授权公开(公告)号：US10232353B2
公开(公告)日：2019-03-19
申请号：US15543291
申请日：2015-12-29
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.
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公开(公告)号：US09732023B2
公开(公告)日：2017-08-15
申请号：US14773602
申请日：2014-03-13
申请人： Torsten Balduf , Steffen Krill , Rudolf Burghardt
发明人： Torsten Balduf , Steffen Krill , Rudolf Burghardt
CPC分类号： C07C51/252 , B01J19/245 , B01J2219/24 , C07C45/75 , C07C51/44 , C07C51/48 , Y02P20/582 , C07C57/04 , C07C47/22
摘要： The invention relates to a process for preparation of at least one of methacrylic acid and a methacrylic acid ester, comprising the process stepsgas phase oxidation of at least one C4 compound, quenching of the reaction phase, separation and purification of the obtained methacrylic acid and optionally esterification, wherein the C4 compound is a methacrolein comprising mixture, originating from at least two different methacrolein sources, a first methacrolein source being a feed stream obtained by the heterogeneously catalyzed gas phase oxidation of isobutylene or tert-butyl alcohol or isobutylaldehyde or a mixture of two or more thereof, a second methacrolein source being a feed stream obtained by the reaction of propionaldehyde with a C1 extending agent, preferably formaldehyde, and where said methacrolein can be obtained either completely from the first methacrolein source, or completely from the second methacrolein source or from any mixture of both.
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公开(公告)号：US10125077B2
公开(公告)日：2018-11-13
申请号：US15515682
申请日：2015-11-16
IPC分类号： C07C57/02 , C07C57/04 , C07C45/75 , C07C51/25 , C07C51/48 , B01D3/14 , B01D69/02 , B01J19/18 , C07C51/235 , C07C47/04 , C07C47/22
摘要： The present invention relates to an optimized process for preparing methacrylic acid, wherein methacrolein is prepared in a first stage from propionaldehyde and formaldehyde by means of a Mannich reaction and oxidized in a second stage to methacrylic acid. More particularly, the present invention relates to the reduction in the amounts of catalyst to be used in the first stage, especially to the reduction in the amounts of acid to be used here, by virtue of the additional installation of recycling streams suitable for the purpose.
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公开(公告)号：US07423173B2
公开(公告)日：2008-09-09
申请号：US10589123
申请日：2005-01-21
CPC分类号： C07C51/06 , C07C51/08 , C07C51/377 , C07C59/01 , C07C57/04
摘要： The invention relates to a process for the selective, economically viable preparation of methacrylic acid and methacrylic esters starting from acetone cyanohydrin, wherein, in a first step, 2-hydroxy-2-methylpropionic acid is prepared by reacting acetone cyanohydrin with sulphuric acid in the presence of water and a suitable polar solvent and is isolated and methacrylic acid is subsequently prepared by β-elimination of water starting from 2-hydroxy-2-methylpropionic acid.
摘要翻译： 本发明涉及从丙酮氰醇开始选择性地，经济上有效地制备甲基丙烯酸和甲基丙烯酸酯的方法，其中在第一步中，2-羟基-2-甲基丙酸是通过使丙酮氰醇与硫酸在 存在水和合适的极性溶剂，并分离，随后通过从2-羟基-2-甲基丙酸开始β-去除水来制备甲基丙烯酸。
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公开(公告)号：US09809530B2
公开(公告)日：2017-11-07
申请号：US15323888
申请日：2015-07-23
CPC分类号： C07C67/20 , B01J21/066 , C01C1/08 , C01C3/02 , C07C69/675
摘要： The present invention relates to a process for preparing alpha-hydroxycarboxylic esters from the alcoholysis of alpha-hydroxycarboxamides in the gas phase, characterized in that the conversion is effected in the presence of water.
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公开(公告)号：US06586635B2
公开(公告)日：2003-07-01
申请号：US10132195
申请日：2002-04-26
申请人： Nongyuan Shi , Bernd Drapal , Steffen Krill , Markus Julino , Klaus Huthmacher
发明人： Nongyuan Shi , Bernd Drapal , Steffen Krill , Markus Julino , Klaus Huthmacher
IPC分类号： C07C4571
CPC分类号： C07C45/513 , C07C45/62 , C07C49/203 , C07C49/04
摘要： A process for the preparation of &bgr;,&ggr;,&dgr;-unsaturated ketones and/or &agr;,&bgr;,&ggr;,&dgr;-unsaturated ketones by the reaction of an unsaturated alcohol with an enol ether or mixture of enol ethers, with formation of ketals as a by-product, at temperatures of from 50° C. to 200° C., in the presence of an acid catalyst, whereby one or all of the reagents is/are heated to the reaction temperature of from 50° C. to 200° C. before the acid catalyst is added.
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