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公开(公告)号：US06252110B1
公开(公告)日：2001-06-26
申请号：US09104358
申请日：1998-06-25
IPC分类号： C07C5702
CPC分类号： C07C51/44 , B01D3/148 , C07C51/487 , Y10S203/22 , C07C57/04
摘要： A method for recovering acrylic acid from high boiling impurities containing acrylic acid dimer, acrylic acid and maleic acid at high efficiency with stability which includes the steps of (1) introducing said high boiling impurities containing acrylic acid dimer, acrylic acid and maleic acid into an acrylic acid recovery column, distilling acrylic acid from the column top and recovering the same, (2) introducing bottom liquid A from said acrylic acid recovery column into a pyrolyzing tank to decompose the acrylic acid dimer in the bottom liquid A, and (3) recirculating at least a part of bottom liquid B from said pyrolyzing tank into the acrylic acid recovery column.
摘要翻译： 一种从高沸点杂质中回收丙烯酸的方法，该方法具有稳定的高效率，包括以下步骤：（1）将含有丙烯酸二聚体，丙烯酸和马来酸的所述高沸点杂质引入到丙烯酸二聚体，丙烯酸和马来酸中 丙烯酸回收塔，从塔顶蒸馏丙烯酸并回收其，（2）将底部液体A从所述丙烯酸回收塔引入热解罐中以分解底部液体A中的丙烯酸二聚体，和（3） 将至少一部分底部液体B从所述热解槽再循环到丙烯酸回收塔中。
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公开(公告)号：US06664418B1
公开(公告)日：2003-12-16
申请号：US09361183
申请日：1999-07-27
IPC分类号： C07C5718
摘要： A method for inhibiting polymerization during transportation, storage and/or production of (meth)acrylic acid or an ester thereof includes adding an N-oxyl compound and water to a vinyl compound; or dissolving an N-oxyl compound in water and adding the solution to a vinyl compound in a process of recovering, purifying, and/or synthesizing of the vinyl compound. The method can effectively inhibit polymerization of the vinyl compound.
摘要翻译： 在（甲基）丙烯酸或其酯的运输，储存和/或生产过程中抑制聚合的方法包括向乙烯基化合物中加入N-氧基化合物和水; 或将N-氧基化合物溶解在水中，并在回收，纯化和/或合成乙烯基化合物的过程中将溶液加入到乙烯基化合物中。 该方法可有效抑制乙烯基化合物的聚合。
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公开(公告)号：US06660881B2
公开(公告)日：2003-12-09
申请号：US09928574
申请日：2001-08-12
申请人： Hajime Matsumoto , Tetsuya Kajihara , Yasuhiro Shingai , Masatoshi Ueoka , Yukihiro Yoneda , Masahiro Uemura , Sei Nakahara , Fumio Munechika
发明人： Hajime Matsumoto , Tetsuya Kajihara , Yasuhiro Shingai , Masatoshi Ueoka , Yukihiro Yoneda , Masahiro Uemura , Sei Nakahara , Fumio Munechika
IPC分类号： C07C6954
摘要： The present invention provides a process for producing a (meth)acrylic ester which enables to obtain a (meth)acrylic ester in an excellent reaction yield. The process for producing a (meth)acrylic ester uses an alcohol and an acid as raw materials and an ion-exchange resin as a catalyst, and the process is characterized by comprising a dehydration step and an esterification step, wherein the esterification reaction step follows the dehydration step in which water impregnated in the ion-exchange resin is removed by using as a dehydrating solvent at least one member selected from the group consisting of the alcohol, the acid, and the resulting ester.
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公开(公告)号：US6084127A
公开(公告)日：2000-07-04
申请号：US31068
申请日：1998-02-26
CPC分类号： C07C51/48
摘要： An improved method which enables stable and effective recovery of acrylic acid over a prolonged period is provided, said method comprising contacting an acrylic acid-containing gas obtained upon gas-phase catalytic oxidation of propylene and/or acrolein, with water, whereby collecting the acrylic acid in form of an aqueous solution, introducing said aqueous solution into an azeotropic separation column and distilling it in the presence of an azeotropic solvent to isolate and recover the acrylic acid, in which polymerization of the acrylic acid in the azeotropic separation column is prevented. Said method is characterized by using as the azeotropic solvent either a mixed solvent composed of solvent A (eg., ethyl acrylate, methyl methacrylate, etc.) and solvent B (eg., toluene, heptane, etc.) (first embodiment) or the solvent A alone (second embodiment).
摘要翻译： 提供了能够在长时间内稳定且有效地回收丙烯酸的改进方法，所述方法包括使丙烯和/或丙烯醛气相催化氧化获得的含丙烯酸的气体与水接触，由此收集丙烯酸 酸的水溶液形式，将所述水溶液引入共沸分离塔并在共沸溶剂存在下蒸馏，以分离和回收丙烯酸，其中防止共沸分离塔中丙烯酸的聚合。 所述方法的特征在于使用由溶剂A（例如丙烯酸乙酯，甲基丙烯酸甲酯等）和溶剂B（例如甲苯，庚烷等）组成的混合溶剂作为共沸溶剂（第一实施方案）或 溶剂A单独（第二实施方式）。
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公开(公告)号：US5785821A
公开(公告)日：1998-07-28
申请号：US759219
申请日：1996-12-05
CPC分类号： C07C51/46
摘要： The present invention provides an improved process for production of acrylic acid by subjecting propylene and/or acrolein to catalytic gas-phase oxidation with a molecular oxygen-containing gas. In the process, the mixed gas obtained by the catalytic gas-phase oxidation is contacted with an aqueous collecting agent containing acrylic acid, acetic acid and a poorly-soluble-in-water solvent, to form an aqueous acrylic acid solution; and the aqueous acrylic acid solution is subjected to azeotropic distillation in the presence of a poorly-soluble-in-water solvent to remove by-products and obtain high-purity acrylic acid.
摘要翻译： 本发明提供通过使丙烯和/或丙烯醛与含分子氧的气体进行催化气相氧化来生产丙烯酸的改进方法。 在此过程中，将通过催化气相氧化获得的混合气体与含丙烯酸，乙酸和难溶于水的溶剂的含水收集剂接触，形成丙烯酸水溶液; 在难溶于水的溶剂的存在下，将丙烯酸水溶液进行共沸蒸馏，除去副产物，得到高纯度丙烯酸。
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6.发明授权Method for inhibiting polymerization of (meth) acrylic acid and esters thereof 失效抑制（甲基）丙烯酸及其酯的聚合的方法
公开(公告)号：US5504243A
公开(公告)日：1996-04-02
申请号：US444869
申请日：1995-05-19
IPC分类号： C07C51/50 , C07C57/075 , C07C67/62 , C07C69/52
摘要： Disclosed herein is a method for inhibiting polymerizable (meth)acrylic acid and esters thereof from polymerizing during their production, transportation and storage by using as the inhibitor N-oxyl compound and more than one compound selected from the group consisting of manganese salt compound, copper salt compound, 2,2,6,6,-tetramethylpiperidine compound and nitroso compound. The N-oxyl compound is one or more kinds selected from 2,2,6,6,-tetramethylpiperidinooxyl, 4-hydroxy-2,2,6,6,-tetramethylpiperidinooxyl and 4,4',4"-tris-(2,2,6,6,-tetramethylpiperidinooxyl)phosphite. The combined use of the inhibitors provides superior inhibiting effect to use alone.
摘要翻译： 本文公开了一种抑制可聚合（甲基）丙烯酸及其酯在制备，运输和储存期间聚合的方法，其用作抑制剂N-氧基化合物和多种选自锰盐化合物，铜 盐化合物，2,2,6,6， - 四甲基哌啶化合物和亚硝基化合物。 N-氧基化合物是选自2,2,6,6， - 四甲基哌啶子基氧基，4-羟基-2,2,6,6'-四甲基哌啶子基氧基和4,4'，4“ - 三 - （ 2,2,6,6， - 四甲基哌啶氧基）亚磷酸酯。 抑制剂的组合使用对单独使用具有优异的抑制作用。
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7.发明授权Method for inhibiting polymerization of (meth) acrylic acid and esters thereof 失效抑制（甲基）丙烯酸及其酯的聚合的方法
公开(公告)号：US5322960A
公开(公告)日：1994-06-21
申请号：US99318
申请日：1993-07-30
摘要： Disclosed herein is a method for inhibiting polymerizable (meth)acrylic acid and esters thereof from polymerizing during their production and storage by using as the inhibitor N-oxyl compound, phenol compound, and phenothiazine compound in combination with one another. The combined use of the three inhibitors provides superior inhibiting effect to use alone alone or in pairs.
摘要翻译： 本文公开了一种通过使用抑制剂N-氧基化合物，酚化合物和吩噻嗪化合物彼此组合来抑制可聚合的（甲基）丙烯酸及其酯在制备和储存期间聚合的方法。 三种抑制剂的组合使用提供了单独使用或成对使用的优异的抑制作用。
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公开(公告)号：US06787001B2
公开(公告)日：2004-09-07
申请号：US10086931
申请日：2002-03-01
IPC分类号： B01D336
CPC分类号： B01D3/36 , C07C51/44 , Y10S203/09 , Y10S203/22 , C07C57/04
摘要： A method for distilling a raw material liquid containing (meth)acrylic acid substantially free from azeotropic solvents, collected with a collection agent from a mixed gas obtained by gas phase catalytic oxidation reactions which includes feeding to a distillation column the raw material liquid which temperature is substantially equal to that of the entrance place in the column.
摘要翻译： 一种蒸馏含有基本上不含共沸溶剂的（甲基）丙烯酸的原料液体的方法，该方法包括将由气相催化氧化反应获得的混合气体用收集剂收集，该方法包括向蒸馏塔中加入温度为 基本上等于列中入口处的位置。
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公开(公告)号：US06452040B2
公开(公告)日：2002-09-17
申请号：US09779205
申请日：2001-02-08
IPC分类号： C07C6726
摘要： The present invention provides a production process for a hydroxyalkyl (meth)acrylate which process enables to maintain the oxygen concentration of a gas phase portion of a reactor within a specific low concentration range in any stage of before adding raw materials, during the reaction, and after the reaction. The production process comprises the step of carrying out a reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate, wherein an inert gas and/or a mixed gas of oxygen and an inert gas with a beforehand adjusted oxygen concentration of 0.1 to 14 vol % is used to maintain the oxygen concentration of a gas phase portion of a reactor in the range of 0.1 to 14 vol % (1) before adding the alkylene oxide or (2) during the above reaction or (3) between the completion of the above reaction and the charge for the next reaction. In addition, another production process comprises the step of carrying out a reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate, wherein the oxygen concentration of a gas phase portion of a reactor is maintained in the range of 0.1 to 14 vol % throughout the production steps.
摘要翻译： 本发明提供一种（甲基）丙烯酸羟烷基酯的制备方法，该方法能够在反应期间在添加原料之前的任何阶段将反应器的气相部分的氧浓度保持在特定的低浓度范围内，以及 反应后。 该制备方法包括在催化剂存在下进行（甲基）丙烯酸和烯化氧之间的反应以制备（甲基）丙烯酸羟烷基酯的步骤，其中惰性气体和/或氧气的混合气体 使用事先调节氧浓度为0.1〜14体积％的惰性气体，在加入环氧烷之前将反应器的气相部分的氧浓度维持在0.1〜14体积％（1）的范围内，或（ 2）在上述反应期间或（3）完成上述反应和下一反应的电荷之间。 此外，另一种制备方法包括在催化剂存在下进行（甲基）丙烯酸和烯化氧之间的反应以制备（甲基）丙烯酸羟烷基酯的步骤，其中气相部分的氧浓度 的反应器在整个生产步骤中保持在0.1至14体积％的范围内。
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公开(公告)号：US06384267B1
公开(公告)日：2002-05-07
申请号：US09503087
申请日：2000-02-14
IPC分类号： C07C6726
摘要： In a process for producing hydroxyalkyl (meth)acrylates by the reaction of (meth)acrylic acid with an alkylene oxide, a thermally and chemically stable anion exchange resin is used as a catalyst, which resin contains a repeating unit represented by the following formula (1) as a component: wherein A is a straight chain alkylene group having 3 to 8 carbon atoms, each of R1, R2, and R3 is a hydrocarbon group or an alkanol group having 1 to 4 carbon atoms, which may be substituted with a hydroxyl group, X− is a counter ion coordinated with an ammonium group, where the substituent A with the ammonium group may be substituted at any position of a benzene ring, and the benzene ring may be substituted with an alkyl group or a halogen atom. The process can economically efficiently produce hydroxyalkyl (meth)acrylates without disadvantages such as deterioration in properties of a distillation residue.
摘要翻译： 在通过（甲基）丙烯酸与烯化氧的反应制备羟烷基（甲基）丙烯酸酯的方法中，使用热化学稳定的阴离子交换树脂作为催化剂，该树脂含有下式所示的重复单元（ 1）作为成分：其中A是具有3至8个碳原子的直链亚烷基，R 1，R 2和R 3各自是烃基或具有1至4个碳原子的链烷醇基，其可以被 羟基，X-是与铵基团配位的抗衡离子，其中具有铵基的取代基A可以在苯环的任何位置被取代，苯环可以被烷基或卤素原子取代。 该方法可以经济有效地生产（甲基）丙烯酸羟烷基酯，而没有缺点，例如蒸馏残余物的性能劣化。
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