公开(公告)号：US20150014150A1

公开(公告)日：2015-01-15

申请号：US13939215

申请日：2013-07-11

申请人： Celanese Acetate LLC

发明人： Denis G. Fallon

IPC分类号： C07C51/573 ,  B01D3/00

CPC分类号： C07C51/573 ,  B01D3/007 ,  Y02P20/124 ,  Y02P70/34

摘要： Integration of a carboxylic anhydride purification system in the manufacturing of cellulose esters may include processes that includes distilling the crude carboxylic anhydride stream (that includes a carboxylic anhydride and a carboxylic acid) in a distillation column having an overhead or side stream comprising purified, vaporous carboxylic anhydride and a bottoms stream; heating a steam condensate stream in a steam generator to yield a low-temperature steam; and cooling at least a portion of the overhead or side stream to yield a cooled overhead or side stream. In some instances, a heat exchanger may be utilized in parallel or series with the steam generator.

摘要翻译： 羧酸酐纯化系统在纤维素酯的制造中的整合可以包括在蒸馏塔中蒸馏粗羧酸酐流（包括羧酸酐和羧酸）的方法，所述蒸馏塔具有包含纯化的汽相羧酸 酸酐和底部物流; 在蒸汽发生器中加热蒸汽冷凝物流以产生低温蒸汽; 并冷却至少一部分塔顶馏出物或侧流以产生冷却的塔顶馏出物或侧流。 在一些情况下，热交换器可以与蒸汽发生器并联或串联使用。

公开(公告)号：US08476463B2

公开(公告)日：2013-07-02

申请号：US12935894

申请日：2009-03-23

申请人： Gunther Windecker ,  Jens Weiguny ,  Alexander Weck ,  Ellen Dahlhoff ,  Wolf-Steffen Weiβker ,  Jörg Heilek ,  Thomas Krug ,  Ralf Freyberger

发明人： Gunther Windecker ,  Jens Weiguny ,  Alexander Weck ,  Ellen Dahlhoff ,  Wolf-Steffen Weiβker ,  Jörg Heilek ,  Thomas Krug ,  Ralf Freyberger

IPC分类号： C07D307/36 ,  C07D307/34

CPC分类号： C07C51/573 ,  C07C57/145

摘要： Processes for decreasing fumaric acid deposits in preparing maleic anhydride by heterogeneously catalyzed oxidation of a hydrocarbon with molecular oxygen. Maleic anhydride is absorbed from the crude mixture in an absorbent in an absorption column and desorbed in a desorption column, the entirety or portion of absorbent depleted in maleic anhydride, for controlled precipitation of fumaric acid, being cooled and/or concentrated by evaporating a portion of absorbent such that the difference between the concentration of fumaric acid in the recycle stream at the outlet of the desorption column under existing conditions and the equilibrium concentration of fumaric acid according to the solubility curve after cooling and/or evaporation of a portion of absorbent is ≧250 ppm by weight, and the fumaric acid precipitated as a solid is removed completely or partly from the absorbent recycling system and the fumaric acid-depleted absorbent is recycled completely or partly to the absorption column.

摘要翻译： 通过用分子氧异构催化氧化烃来减少富马酸沉积物制备​​马来酸酐的方法。 马来酸酐在吸收塔中的吸收剂中从粗混合物中吸收并在解吸塔中解吸，耗尽马来酸酐的全部或部分吸收剂用于控制富马酸的沉淀，通过蒸发一部分而被冷却和/或浓缩 的吸收剂，使得在现有条件下在解吸塔出口处的再循环料流中的富马酸浓度与部分吸收剂冷却和/或蒸发后根据溶解度曲线的平均浓度的富马酸的差异是 > 250ppm（重量），并且作为固体沉淀的富马酸被完全或部分地从吸收剂再循环系统中除去，富马酸贫乏的吸收剂被完全或部分地再循环到吸收塔。

公开(公告)号：US08337671B2

公开(公告)日：2012-12-25

申请号：US12300189

申请日：2007-03-14

申请人： Dirk Broell ,  Hermann Siegert

发明人： Dirk Broell ,  Hermann Siegert

IPC分类号： B01D3/34 ,  C07C51/44 ,  C07C57/07

CPC分类号： C07C51/44 ,  C07C51/573 ,  C07C57/04

摘要： Process for distillatively purifying polymerizable compounds using a high-boiling, inert, thermally long-term-stable substance as a boiling oil, characterized in that the boiling oil is disposed in the bottom of a rectification column.

摘要翻译： 使用高沸点，惰性，长期稳定的长沸石物质作为沸点油蒸馏精制可聚合化合物的方法，其特征在于将沸点油置于精馏塔底部。

公开(公告)号：US08097757B2

公开(公告)日：2012-01-17

申请号：US12863033

申请日：2009-01-27

申请人： Jean-Michel Paul ,  Serge Tretjak

发明人： Jean-Michel Paul ,  Serge Tretjak

IPC分类号： C07C51/56 ,  C07C53/00

CPC分类号： C07C51/56 ,  C07C51/573 ,  C07C57/04

摘要： The present invention relates to an improved method for preparing (meth)acrylic anhydride (A(M)A2O) by transanhydrification between (meth)acrylic acid and acetic anhydride in the presence of at least one polymerization inhibitor, in which reaction to the point of partial conversion of the reagents is carried out, followed by continuous distillation. With the method according to the invention, it is possible to produce I1A(M)A2O of very high purity under improved productivity conditions compared to existing methods while eliminating problems of reactor fouling.

摘要翻译： 本发明涉及通过（甲基）丙烯酸和乙酸酐在至少一种聚合抑制剂的存在下的跨氢化制备（甲基）丙烯酸酐（A（M）A 2 O）的改进方法， 进行试剂的部分转化，接着进行连续蒸馏。 利用根据本发明的方法，与现有方法相比，在提高的生产率条件下可以产生非常高纯度的I1A（M）A2O，同时消除反应堆结垢的问题。

公开(公告)号：US20100317892A1

公开(公告)日：2010-12-16

申请号：US12863033

申请日：2009-01-27

申请人： Jean-Michel Paul ,  Serge Tretjak

发明人： Jean-Michel Paul ,  Serge Tretjak

IPC分类号： C07C51/56

CPC分类号： C07C51/56 ,  C07C51/573 ,  C07C57/04

摘要： The present invention relates to an improved method for preparing (meth)acrylic anhydride (A(M)A2O) by transanhydrification between (meth)acrylic acid and acetic anhydride in the presence of at least one polymerization inhibitor, in which reaction to the point of partial conversion of the reagents is carried out, followed by continuous distillation. With the method according to the invention, it is possible to produce I1A(M)A2O of very high purity under improved productivity conditions compared to existing methods while eliminating problems of reactor fouling.

摘要翻译： 本发明涉及通过（甲基）丙烯酸和乙酸酐在至少一种聚合抑制剂的存在下的跨氢化制备（甲基）丙烯酸酐（A（M）A 2 O）的改进方法， 进行试剂的部分转化，接着进行连续蒸馏。 利用根据本发明的方法，与现有方法相比，在提高的生产率条件下可以产生非常高纯度的I1A（M）A2O，同时消除反应堆结垢的问题。

公开(公告)号：US07619098B2

公开(公告)日：2009-11-17

申请号：US11813181

申请日：2005-12-31

申请人： Werner Peschel ,  Matthias Kummer ,  Marcus Bechtel

发明人： Werner Peschel ,  Matthias Kummer ,  Marcus Bechtel

IPC分类号： C07D307/89

CPC分类号： C07C51/573 ,  B01D3/14 ,  C07D307/89 ,  C07C63/16

摘要： Process for the preparation of on-spec phthalic anhydride by the distillative purification of crude phthalic anhydride at reduced pressure, where the crude phthalic anhydride is passed to the distillation column above a side take-off, the low-boiling components are removed at the top of the column or in the vicinity of the top of the column and the on-spec phthalic anhydride is removed from the side take-off of the column, in which a distillation column is used whose number of theoretical plates located above the supply of the crude phthalic anhydride into the distillation column is 10 to 20 and the column is operated at a reflux ratio of from 0.1 to 0.5.

摘要翻译： 通过在减压下蒸馏粗纯化邻苯二甲酸酐的方法制备规格上邻苯二甲酸酐的方法，其中粗的邻苯二甲酸酐在侧馏分上方通入蒸馏塔，低沸点组分在顶部除去 的柱或塔顶附近，并且从柱的侧向排出中去除特定的邻苯二甲酸酐，其中使用蒸馏塔，其中理论塔板的数量高于 粗制邻苯二甲酸酐进入蒸馏塔中为10〜20，塔的回流比为0.1〜0.5。

公开(公告)号：US06710187B2

公开(公告)日：2004-03-23

申请号：US10063795

申请日：2002-05-14

申请人： Thomas Link Guggenheim ,  David Anthony Mongilio

发明人： Thomas Link Guggenheim ,  David Anthony Mongilio

IPC分类号： C07D30789

CPC分类号： C07C51/573 ,  Y10S159/901 ,  C07C65/24

摘要： A process to isolate dianhydride from an exchange reaction comprises extracting a bisimide/anhydride exchange reaction aqueous phase with an organic solution comprising an exchange catalyst at a first temperature and pressure to form an extracted aqueous phase comprising water, exchange catalyst and a dianhydride precursor; removing water from the extracted aqueous phase at a second temperature and pressure to form a molten phase, wherein the second pressure is less than the first pressure; removing water and exchange catalyst from the molten phase at a third temperature and pressure to form an isolation mixture; and converting the dianhydride precursor in the isolation mixture to dianhydride at a fourth temperature and pressure, wherein the fourth temperature is greater than the second and third temperatures and the fourth pressure is less than the second and third pressures.

摘要翻译： 从交换反应中分离二酐的方法包括在第一温度和压力下用包含交换催化剂的有机溶液萃取双酰亚胺/酸酐交换反应水相以形成包含水，交换催化剂和二酐前体的萃取水相; 在第二温度和压力下从提取的水相中除去水以形成熔融相，其中第二压力小于第一压力; 在第三温度和压力下除去水并从熔融相中交换催化剂以形成分离混合物; 以及在第四温度和压力下将分离混合物中的二酐前体转化为二酐，其中第四温度大于第二和第三温度，第四压力小于第二和第三压力。

公开(公告)号：US06579990B2

公开(公告)日：2003-06-17

申请号：US09933075

申请日：2001-08-21

申请人： Kazuo Tanaka ,  Atsushi Okoshi ,  Kengi Nakaya

发明人： Kazuo Tanaka ,  Atsushi Okoshi ,  Kengi Nakaya

IPC分类号： C07D49300

CPC分类号： C07C51/56 ,  C07C51/43 ,  C07C51/573 ,  C07C63/313

摘要： A process for refined pyromellitic anhydride which comprises dissolving crude pyromellitic acid or crude pyromellitic anhydride in water, then cooling an aqueous solution thus obtained to perform crystallization as pyromellitic acid, then separating a crystal thus obtained from water, then anhydrating the crystal of pyromellitic acid thus separated with heating to produce pyromellitic anhydride, then vaporizing pyromellitic anhydride thus produced, cooling vapor of pyromellitic anhydride thus obtained, and thereby, recovering a refined crystal of pyromellitic anhydride.

公开(公告)号：US20020169330A1

公开(公告)日：2002-11-14

申请号：US10142136

申请日：2002-05-09

发明人： Kenji Nakahara ,  Tsukasa Takahashi ,  Shigetaka Takamiya

IPC分类号： C07D493/02

CPC分类号： C07C51/265 ,  C07C51/573 ,  C07C63/313

摘要： A method for producing crystals of pyromellitic dianhydride is disclosed which is characterized by setting the water content of an atmosphere used in handling the crystals of pyromellitic dianhydride at a temperature of not higher than 120null C. at a level of not more than 4 vol. %. Particularly by supplying an inert gas having a water content of not more than 4 vol. % to the step of production, it is made possible to prevent the conversion of pyromellitic dianhydride by hydration very efficiently.

摘要翻译： 公开了一种制备均苯四酸二酐的晶体的方法，其特征在于在不高于120℃的温度下，将1,2,4,5-苯四酸二酐的结晶处理所用气氛的含水量设定为4体积％以下。 ％。 特别是通过供给含水量不超过4体积％的惰性气体。 对于生产步骤，可以非常有效地防止水合产生均苯四酸二酐的转化。

公开(公告)号：US5990347A

公开(公告)日：1999-11-23

申请号：US431138

申请日：1995-04-28

申请人： Kirsten Everald Clode

发明人： Kirsten Everald Clode

IPC分类号： B01J31/20 ,  B01J31/28 ,  C07C51/12 ,  C07C51/44 ,  C07C51/573 ,  C07C67/36 ,  C07C67/54 ,  C07C51/10 ,  C07C51/14

CPC分类号： C07C51/12 ,  B01J31/0231 ,  B01J31/20 ,  B01J31/30 ,  C07C51/44 ,  C07C51/573 ,  C07C67/36 ,  C07C67/54 ,  B01J2231/34 ,  B01J2531/827

摘要： A process for preparing a carboxylic acid having n+1 carbon atoms by contacting carbon monoxide with a liquid reaction composition comprising an alcohol of n carbon atoms or an ester derivative thereof; an iridium carbonylation catalyst and a hydrocarbyl halide promoter wherein in the liquid reaction composition the concentration of water is about 2 to 8% by weight, the concentration of ester derivative of said alcohol and product acid is from 1 to 60% by weight (preferably 3-35% by weight), and the concentration of hydrocarbyl halide is from 2 to 10% weight.

摘要翻译： 通过使一氧化碳与含有n个碳原子的醇或其酯衍生物的液体反应组合物接触来制备具有n + 1个碳原子的羧酸的方法; 铱羰基化催化剂和烃基卤化物助剂，其中在液体反应组合物中水的浓度为约2至8重量％，所述醇和产物酸的酯衍生物的浓度为1至60重量％（优选3 -35重量％），烃基卤化物的浓度为2〜10重量％。