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| Number | Title | Issue Date |
| 7141695 | Methods for producing substituted acrylic acid esters and use of the latter for producing substituted γ-amino acids The invention relates to methods for producing substituted acrylic acid esters and to the use of the latter for producing substituted γ-amino acids, such as gabapentin and pregabalin. The substituted acrylic acid esters are produced by Wadsworth-Emmons olefination ... | 11/28/2006 |
| 7084300 | Work-up of residues in the preparation of carboxylic acids Degradation acids obtained in the synthesis of carboxylic acids, in particular dicarboxylic acids, having from 8 to 16 carbon atoms may be isolated by separating the degradation acids in the form of a solid from the crude reaction mixture, then washing the degradati... | 08/01/2006 |
| 7019167 | Process for producing alkanedicarboxylic acid A method for manufacturing an alkanedicarboxylic acid by oxidizing cycloalkanol and/or cycloalkanone with an aqueous solution of nitric acid, which comprises using an adiabatic reactor comprising a feed nozzle enabling to feed cycloalkanol and/or cycloalkanone at a ... | 03/28/2006 |
| 6946572 | Crystallization of adipic acid from its solution in aqueous nitric acid Process for crystallization of adipic acid from a nitric acid oxidation product of cyclohexane in which process the oxidation product is subject to crystallization in a series of crystallizers of decreasing crystallization temperature. ... | 09/20/2005 |
| 6939991 | Preparation of acrylic acid In a process for preparing acrylic acid, an acrylic acid-containing product gas mixture obtained by catalytic gas phase partial oxidation of a C3 precursor of acrylic acid, after direct cooling with a quench liquid, is fractionally condensed in a separati... | 09/06/2005 |
| 6822117 | Method for making adipic acid The present invention relates to a process for the manufacture of adipic acid, more particularly of adipic acid crystals. It relates more specifically to a process for the treatment of the adipic acid crystals obtained on conclusion of crystallization, which ... | 11/23/2004 |
| 6781017 | Method for the production of acrolein or acrylic acid or the mixture thereof from propane In a process for the preparation of acrolein or acrylic acid or a mixture thereof from propane, the propane is subjected, in a first reaction stage, to a partial dehydrogenation under heterogeneous catalysis to give propene, of the components contained in the produc... | 08/24/2004 |
| 6392092 | Process for manufacturing 3-hydroxy-3-methylbutanoic acid A method for manufacturing 3-hydroxy-3-methylbutanoic acid (HMB) in commercially viable amounts is disclosed. The reaction mixture cycles through an external heat exchanger while the primary reactant is added in a warmer so as to control and maintain a lo... | 05/21/2002 |
| 6376709 | Process for the crystallization of dicarboxylic acids The subject invention relates to a process for the crystallization of di-carboxylic acids comprising dissolving the crude dicarboxylic acid at a temperature sufficient to dissolve the crude diacid in the solvent, whereby portion of the said solvent evapor... | 04/23/2002 |
| 6248922 | Process for manufacturing 3-hydroxy-3-Methylbutanoic acid A method for manufacturing 3-hydroxy-3-methylbutanoic acid (HMB) in commercially viable amounts is disclosed. The reaction mixture cycles through an external heat exchanger while the primary reactant is added in a warmer so as to control and maintain a lo... | 06/19/2001 |
| 6090978 | Process for manufacturing 3-hydroxy-3-methylbutanoic acid A method for manufacturing 3-hydroxy-3-methylbutanoic acid (HMB) in commercially viable amounts is disclosed. The reaction mixture cycles through an external heat exchanger while the primary reactant is added in a warmer so as to control and maintain a lo... | 07/18/2000 |
| 5471001 | Crystallization of adipic acid Crystallization of adipic acid using low intensity ultrasonic agitation during crystallization results in purer product that is more readily handled. Apparatus for carrying out the process is also disclosed.... | 11/28/1995 |
| 5296639 | Adipic acid purification A process for purification of adipic acid during crystallization by modifying the crystal morphology to decrease incorporation of impurities through the introduction of an effective amount of an additive to the crystallizing solution.... | 03/22/1994 |
| 4902827 | Process for the preparation of adipic acid Disclosed is an improved process for the preparation of adipic acid by the air oxidation of cyclohexane in the presence of acetic acid and a catalyst system comprising cobalt and zirconium and/or hafnium.... | 02/20/1990 |
| 4532347 | Membrane solvent extraction process The instant invention relates to a membrane solvent extraction and reaction system. More particularly it pertains to an improvement in the membrane solvent extraction system wherein a solute is extracted through a polymeric membrane from one solvent liqui... | 07/30/1985 |
| 4510321 | Autoxidative cleavage of ketones in the presence of pulverized alkali metal hydroxide Processes for the autoxidative cleavage of selected ketones such as C4 -C10 cycloalkanones having at least one hydrogen or at least one R group on a carbon alpha to the carbonyl carbon or aryl alkyl ketones having the formula III ... | 04/09/1985 |
| 4450291 | Decontamination of KA oil refinement waste stream A process for the decontamination of the distillation refinement residue from the process of oxidizing cyclohexane to KA oil is provided. The process comprises washing the distillation refinement residue with the crystallization by-product obtained in cry... | 05/22/1984 |
| 4442303 | Recovery of water miscible organic acids from aqueous solution as alkyl esters In one of its embodiments this invention provides a process for recovering C4 -C6 dicarboxylic acid components contained in a waste byproduct stream derived from a reaction system in which adipic acid is produced by nitric acid oxida... | 04/10/1984 |
| 4375552 | Nitric acid process for production of adipic acid from hydrocarbons Waste streams from adipic acid manufacture containing nitric, succinic, glutaric and adipic acids and valuable catalytic metal as salts are treated with alcohols, thereby separating, as esters, succinic and glutaric acids which would contaminate pure adip... | 03/01/1983 |
| 4321407 | Treatment of dibasic esters with alkali metal borohydrides Process for reducing the color forming tendency of alkanedioic acid esters by contact with an alkali metal borohydride in the presence of water.... | 03/23/1982 |
| 4254283 | Process for preparing adipic acid with recovery of glutaric and succinic acids In the manufacture of adipic acid by nitric acid oxidation of cyclohexanol and cyclohexanone glutaric and succinic acids are recovered from the reaction by-product and waste stream by crystallizing adipic acid and succinic acid out of the stream leaving g... | 03/03/1981 |
| 4230887 | Recovery of anhydrous acids C2 -C6 monocarboxylic and dicarboxylic acids are scrubbed from gas phase mixtures of such acids and water by gas absorption techniques utilizing a liquid solvent comprising a polyoxyalkylene glycol or a monoalkyl or dialkyl ether the... | 10/28/1980 |
| 4146730 | Method for obtaining glutaric acid, succinic acid, and adipic acid from an acid mixture comprising them A method for obtaining glutaric acid, succinic acid, and adipic acid from an acid mixture obtained as a by-product in the industry and comprising glutaric acid, succinic acid and adipic acid, which comprises the steps of: (1) contacting the acid mixture w... | 03/27/1979 |
| 4082788 | Esterification and extraction process Organic acids contained in aqueous solution are separated and/or recovered by a process comprising adding an alcohol to the aqueous solution to esterify the acids present, while preferably simultaneously contacting the alcoholic mixture with a water-immis... | 04/04/1978 |
| 4076948 | Process for treatment of adipic acid mother liquor Treatment of aqueous nitric acid solutions resulting from the nitric acid oxidation of cyclohexanol and/or cyclohexanone in the presence of metal compound oxidation catalysts for recovery of the valuable components contained therein, which comprises addin... | 02/28/1978 |
| 4067779 | Process for the purification of 1,10-decanedicarboxylic acid Crude 1,10-decanedicarboxylic acid produced by the nitric acid oxidation at 20°14 60° C. of cyclododecanone, cyclododecanol or a mixture thereof can be purified by distillation to a purity suitable for use in the production of polyamides and polyesters ... | 01/10/1978 |
| 3997601 | Adipic acid manufacture In the continuous manufacture of adipic acid by nitric acid oxidation of an organic feedstock oxidisable thereto in which cooling is effected by recycling the reaction mixture through a cooling circuit external to the reactor, improved temperature control... | 12/14/1976 |
| 3991099 | Process for the preparation of mixture consisting predominantly of .epsilon . -formylvaleric acid and the esters of these acids A process for preparing a mixture of organic carboxylic acids and esters thereof consisting predominantly of epsilon-hydroxycaproic acid, adipic acid, formylvaleric acid, and esters of these acids by oxidizing a mixture of cyclohexane, cyclohexanol and cy... | 11/09/1976 |
| 3983208 | Recovery of vanadium and copper catalyst metals using ketones An aqueous nitric acid solution derived from an adipic acid process containing copper and vanadium catalyst values and alkyl dicarboxylic acids is treated to remove the nitric acid and water therefrom so as to obtain a substantially dry, molten-type resid... | 09/28/1976 |
| 3965164 | Recovery of oxidation catalyst metals from adipic acid production In a process for the production of adipic acid by nitric acid oxidation of cyclohexanol and/or cyclohexanone wherein copper and vanadium values are recovered by ion exchange means, the improvement which comprises utilizing the off-gas from the nitric acid... | 06/22/1976 |
