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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：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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3.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：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：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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7.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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公开(公告)号：US09428437B2
公开(公告)日：2016-08-30
申请号：US14891861
申请日：2014-04-28
申请人： Alexander May , Steffen Krill , Joerg Becker , Willi Ploesser , Marcel Treskow , Martin Koestner
发明人： Alexander May , Steffen Krill , Joerg Becker , Willi Ploesser , Marcel Treskow , Martin Koestner
IPC分类号： C07C51/44 , C07C51/47 , C07C51/48 , C07C51/377 , C07C51/43
CPC分类号： C07C51/377 , C07C51/43 , C07C51/44 , C07C51/47 , C07C51/48 , Y02P20/582 , C07C57/04
摘要： The present invention describes a process for preparing alpha-beta-unsaturated carboxylic acids by dehydration of hydroxycarboxylic or alkoxycarboxylic acids which are substituted in the alpha position, in particular 2-hydroxyisobutyric acid, while avoiding accumulation of by-products and additives.
摘要翻译： 本发明描述了通过在α位被取代的羟基羧酸或烷氧基羧酸脱水制备α-β-不饱和羧酸的方法，特别是2-羟基异丁酸，同时避免了副产物和添加剂的积累。
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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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公开(公告)号：US06583323B2
公开(公告)日：2003-06-24
申请号：US10092478
申请日：2002-03-08
申请人： Steffen Krill
发明人： Steffen Krill
IPC分类号： C07C4572
CPC分类号： C07C49/04 , C07C45/73 , Y02P20/582
摘要： Methylheptanone and corresponding homologous methylketones, in particular phytone and tetrahydrogeranyl acetone, are produced by aldol condensation of isovaleraldehyde or prenal or the corresponding aldehydes with acetone in the presence of a catalyst phase, which contains an aldolizing catalyst and a heterogeneous hydrogenating catalyst.
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