Ether Or Carboxylic Acid Ester Reactant Patents (Class 562/893)
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Patent number: 11608306Abstract: Provided is a method of producing an anhydride of an organic mono-acid comprising contacting an organic mono-acid and a thermally regenerable anhydride to produce the anhydride of the organic mono-acid, and either a diacid of the regenerable anhydride, a partially hydrolyzed regenerable anhydride, or both. In a particular example, acetic acid and glutaric anhydride can be reacted to form acetic anhydride.Type: GrantFiled: May 7, 2021Date of Patent: March 21, 2023Assignee: Hyconix, Inc.Inventors: Johnathan Gorke, Brian Hashiguchi, Michael Konnick, Jeffrey Elks, Jeremy Patt, Juan Gamboa
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Patent number: 9102613Abstract: A method is described for the production of sorbic anhydride, in which alkali metal or alkaline earth metal salts of sorbic acid are reacted with phosgene in an inert organic solvent. In addition, use thereof as a preservative in foods, in particular drinks, is described.Type: GrantFiled: October 27, 2011Date of Patent: August 11, 2015Assignee: LANXESS DEUTSCHLAND GMBHInventors: Ralf Krahwinkel, Robert Markert, Edwin Ritzer, Erasmus Vogl
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Publication number: 20100317892Abstract: 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.Type: ApplicationFiled: January 27, 2009Publication date: December 16, 2010Applicant: Arkema FranceInventors: Jean-Michel Paul, Serge Tretjak
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Patent number: 7812192Abstract: The present invention is directed to using methyl acetate from a vinyl acetate-based or a vinyl- or ethylene-alcohol based polymer or copolymer process directly for use in a methanol carbonylation production process to produce acetic acid, acetic anhydride, or a coproduction of each. Methyl acetate is a by-product of commercial polyvinyl-alcohol or alkene vinyl alcohol copolymer-based processes. Generally, this material is processed to recover methanol and acetic acid. Discussed herein is a cost-saving scheme to by-pass the methyl acetate processing at production or plant facilities and utilize the methyl acetate in an integrated methanol carbonylation unit. The scheme discussed eliminates an expensive hydrolysis step often associated with the polymer process.Type: GrantFiled: August 23, 2006Date of Patent: October 12, 2010Assignee: Celanese International CorporationInventors: Mark O. Scates, Stephen Charles Webb
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Patent number: 7427692Abstract: A process for preparation of 7-[D-?-amino-?-(4-hydroxyphenyl)acetamido]-3-(1-propen-1-yl)-3-cephem-4-carboxylic acid viz. Cefprozil of formula (I) in high purity, substantially free of impurities, which comprises preparation of mixed acid anhydride by selecting the sequence and temperature of addition of the reagents and its subsequent condensation with a protected 7-APCA; followed by hydrolysis, isolation and purification to give Cefprozil of formula (I) in the form of a monohydrate.Type: GrantFiled: February 23, 2006Date of Patent: September 23, 2008Assignee: Lupin Ltd.Inventors: Om Dutt Tyagi, Dnyandev Ragho Rane, Tushar Kumar Srivastava, Krishnarao Tukaram Sirsath
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Patent number: 7253316Abstract: Disclosed is a method for jointly producing (i) formic acid (III); (ii) a carboxylic acid comprising at least two carbon atoms (II) and/or the derivatives thereof; and (iii) a carboxylic acid anhydride (VII). According to said method, (a) a formic acid ester (I) is transesterfied to formic acid (III) and the corresponding carboxylic acid ester (IV) by means of a carboxylic acid comprising at least two carbon atoms (II); (b) at least one portion of the carboxylic acid ester (IV) formed in step (a) is carbonylated in order to obtain the carboxylic acid anhydride (V); and (c) at least one portion of the carboxylic acid anhydride (V) formed in step (b) is further dehydrated by means of a carboxylic acid (VI) so as to form a carboxylic acid anhydride (VII) and the carboxylic acid (II).Type: GrantFiled: October 21, 2003Date of Patent: August 7, 2007Assignee: BASF AktiengesellschaftInventors: Jörg Pastre, Kai Michael Exner, Wolfram Stüer, Elke Geissler, Otto Machhammer
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Patent number: 6469206Abstract: Disclosed is a process for the preparation of trifluoromethanesulfonic acid anhydride by the steps of (1) forming a mixed anhydride comprising a trifluoromethanesulfonyl acyl residue and a carboxyl residue by contacting trifluoromethanesulfonic acid or a derivative thereof with a carboxyl compound selected from ketene, dialkyl ketenes, carboxylic acids, and derivatives of carboxylic acids and (2) subjecting the mixed anhydride to reactive distillation wherein the mixed anhydride undergoes disproportionation to produce triflic anhydride and a higher boiling carboxylic acid anhydride.Type: GrantFiled: February 26, 2001Date of Patent: October 22, 2002Assignee: Eastman Chemical CompanyInventors: Robert Thomas Hembre, Robert Lin
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Patent number: 6274096Abstract: The retrofitting of an existing methanol or methanol/ammonia plant to make acetic acid is disclosed. The plant is retrofitted to feed carbon dioxide into a reformer to which natural gas and steam (water) are fed. Syngas is formed in the reformer wherein both the natural gas and the carbon dioxide are reformed to produce syngas with a large proportion of carbon monoxide relative to reforming without added carbon dioxide. The syngas is split into a first part and a second part. The first syngas part is converted to methanol in a conventional methanol synthesis loop that is operated at about half of the design capacity of the original plant. The second syngas part is processed to separate out carbon dioxide and carbon monoxide, and the separated carbon dioxide is fed back into the feed to the reformer to enhance carbon monoxide formation. The separated carbon monoxide is then reacted with the methanol to produce acetic acid or an acetic acid precursor by a conventional process.Type: GrantFiled: November 1, 1999Date of Patent: August 14, 2001Assignee: Acetex (Cyprus) LimitedInventors: Daniel Marcel Thiebaut, Kenneth Ebenes Vidalin
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Patent number: 6222070Abstract: In a liquid phase carbonylation process for the production of acetic anhydride by reacting a feed stream which includes methyl acetate, methanol and carbon monoxide using a Group VIII metal-containing catalyst, and preferably a rhodium containing material, a liquid reaction product is continuously withdrawn from the carbonylation zone and fed to an evaporation/separation zone for separating volatile constituents of the reaction from the non-volatile constituents which, includes a portion of the Group VIII metal catalyst from the carbonylation reactor. The Group VIII metal catalyst is contacted with a gas stream which includes hydrogen for a period of from about 0.001 seconds to about 200 seconds as it is being returned to the carbonylation zone.Type: GrantFiled: September 7, 1999Date of Patent: April 24, 2001Assignee: Eastman Chemical CompanyInventors: Joseph Nathaniel Bays, Joseph Robert Zoeller, Michael Roy Cushman, Brent Alan Tennant
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Patent number: 5922911Abstract: Disclosed is a carbonylation process for the manufacture of acetic anhydride wherein the utilization of carbon monoxide is increased. The process involves the liquid phase manufacture of acetic anhydride by contacting a mixture of (i) a reactant compound selected from methyl acetate, dimethyl ether or a mixture thereof, (ii) methyl iodide, (iii) catalyst components comprising rhodium and one or more promoters, and (iv) dissolved carbon monoxide in a carbonylation zone in which carbon monoxide is not fed below the surface of the mixture in a manner to increase the concentration of carbon monoxide in the liquid reaction mixture.Type: GrantFiled: April 24, 1998Date of Patent: July 13, 1999Assignee: Eastman Chemical CompanyInventors: William Crawford Jones, Eleanor Hawkins Cwirko
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Patent number: 5391796Abstract: A two step process, each of the steps being novel, for the production of trifluorovinyl ethers by reaction of a siloxane with selected acyl fluorides or carboxylic anhydrides, is disclosed. Also disclosed is a novel silyl ester intermediate.Type: GrantFiled: August 12, 1993Date of Patent: February 21, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: William B. Farnham
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Patent number: 5298586Abstract: The solubility and stability of rhodium catalysts in rhodium-catalysed carbonylation of alkyl esters or alkyl ethers under substantially anhydrous conditions to produce carboxylic acid anhydrides is improved by the use of co-promoters selected from the group:1,3-dialkyl-4-methylimidazolium iodide;1,3-dialkyl-4-ethylimidazolium iodide;1,3-dialkyl-4-n-propylimidazolium iodide;1,3-dialkyl-4-isopropylimidazolium iodide;1,3-dialkyl-4-n-butylimidazolium iodide1,3-dialkyl-4-sec-butylimidazolium iodide1,3-dialkyl-4-tert-butylimidazolium iodide;1,3-dialkyl-2,4,5-trimethylimidazolium iodide and mixtures thereof wherethe alkyl groups are independently C.sub.1 to C.sub.20 alkyl.Type: GrantFiled: October 22, 1992Date of Patent: March 29, 1994Assignee: BP Chemicals LimitedInventors: Robert G. Beevor, Neil A. Greener, David J. Gulliver, Robert M. Sorrell
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Patent number: 5292948Abstract: Disclosed is a continuous process for the preparation of acetic anhydride which comprises carbonylating a mixture comprising (i) methyl iodide and (ii) methyl acetate and/or dimethyl ether in the presence of a rhodium catalyst and a promoter wherein the concentration of mesityl oxide in the carbonylation mixture is suppressed by the presence therein of at least 100 ppm of dissolved ferrous and/or cobaltous ion.Type: GrantFiled: May 28, 1993Date of Patent: March 8, 1994Assignee: Eastman Kodak CompanyInventors: Joseph R. Zoeller, Charles E. Outlaw, Regina M. Moncier