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| Number | Title | Issue Date |
| 8034975 | Method of manufacturing succinic acid and ammonium succinate solutions The present invention provides a method of manufacturing a highly pure ammonium succinate solution including the steps of (A) producing calcium succinate trihydrate by crystallization fermentation of a microorganism; (B) converting calcium succinate trihydrate to ca... | 10/11/2011 |
| 7411090 | Process for the recovery of citric acid The invention provides a process for the recovery of citric acid from an aqueous solution feed stream originating in fermentation of carbohydrates and utilizing an amine solvent extraction step for separation of impurities comprising: subjecting said aqueous solutio... | 08/12/2008 |
| 7371890 | Method for the continuous production of a compound that carries at least two functional groups A process for continuously preparing a compound which bears at least two functional groups which are each independently selected from the group consisting of nitrile group, carboxylic acid group, carboxylic ester group and carboxamide group. ... | 05/13/2008 |
| 7282151 | Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using pressure filtration A process is disclosed that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves recovery of a metal catalyst from an oxidizer purge st... | 10/16/2007 |
| 7253312 | Process for producing carboxylic acids The present invention relates to a process for producing carboxylic acids. It relates more particularly to a process for producing carboxylic acids by oxidation of a hydrocarbon with oxygen or a gas containing oxygen, and even more particularly to the oxidation of c... | 08/07/2007 |
| 7217837 | Method for producing organic acid A free organic acid can be produced efficiently at a low cost, by subjecting an ammonium salt of organic acid A such as a dicarboxylic acid, a tricarboxylic acid or an amino acid, to reactive crystallization with an acid B, such as a monocarboxylic acid, wherein org... | 05/15/2007 |
| 7144977 | Lactic acid processing; methods; arrangements; and, products The techniques for processing lactic acid/lactate salt mixtures are provided. Preferred mixtures for processing are obtained from fermentation broths, preferably from fermentation processes conducted at a pH of 4.8 or lower. The techniques generally concern the prov... | 12/05/2006 |
| 7139662 | Device and method for determining the position of a working part A device and method for determining the position for a working part of a machine with a position-determining apparatus is disclosed. A detector is placed at a defined place on the machine to determine the position in a fixed coordinate system. A positional relations... | 11/21/2006 |
| 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 |
| 7019170 | Process for the recovery of lactic acid by contacting aqueous solutions containing the same with a basic organic extractant The invention provides a process for the recovery of lactic acid and products thereof from an aqueous solution containing free lactic acid and at least one lactate salt at a total concentration of at least 5%, the process comprising the steps of: extracting at least... | 03/28/2006 |
| 7003386 | Device and method for determining the position of a working part The invention relates to a device and to a method for determining the position for a working part of a tool on a working machine with a position-determining apparatus (2, 4, 5, 6; 2, 4a, 4b, 5, 6′; 31, 33, 49, 50, 51, 1′,53). At least one de... | 02/21/2006 |
| 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 |
| 6946571 | Drying of adipic acid Process for drying moist, solid adipic acid using at least two drying stages in which moist solid adipic acid is progressively dried by contacting it in at least two successive stages with a nonreactive gas, the temperature of the first stage being lower than the te... | 09/20/2005 |
| 6926810 | Process for obtaining an organic acid from an organic acid ammonium salt, an organic acid amide, or an alkylamine organic acid complex Disclosed herein are methods for the recovery of an organic acid, such as a heat stable lactic acid, from a feed stream which contains at least one of an organic acid amide, an organic acid ammonium salt, or an alkylamine-organic acid complex. The feed stream is mix... | 08/09/2005 |
| 6903235 | Pharmaceutical-grade ferric citrate The present invention relates to pharmaceutical-grade ferric citrate. Pharmaceutical-grade ferric citrate contains a definite composition and a definite hydrate. The present invention also relates to a method using a solid—solid reaction to produce pharmaceutical-... | 06/07/2005 |
| 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 |
| 6667417 | Process for the recovery of lactic acid The invention provides a process for producing lactic acid from a medium containing an alkaline earth-metal salt of lactic acid, comprising (a) reacting a conjugated base of an alkali metal from a subsequent step with the medium to form a water soluble al... | 12/23/2003 |
| 6627768 | Process for recovery of acid The invention provides a process for the conversion of an extracted carboxylic acid to a non-ionized derivative thereof, comprising contacting a carboxylic acid containing aqueous solution with a water-insoluble amine solvent, to recover acid therefrom an... | 09/30/2003 |
| 6600070 | Methods for making 2-(ω-alkoxycarbonylalkanoyl)-4-butanolide, ester of ω-hydroxy-(ω-3)-ketoaliphatic acid, and derivatives thereof In industrial production of ω-hydroxyaliphatic acid being an important intermediate for large cyclic lactone-based perfumes, using dicarboxylate ester which is inexpensive and readily obtainable, a method, with high yield and improved selectively, for ma... | 07/29/2003 |
| 6559339 | Method for crystallizing carboxylic acid The present invention relates to a process for the crystallization of carboxylic acid, more particularly adipic acid, and a process for manufacturing crystalline carboxylic acid, more specifically a process for treating the reaction medium resulting from ... | 05/06/2003 |
| 6538156 | Method for purifying adipic acid by crystallization The invention discloses a method for purifying adipic acid by crystallization or recrystallization in at least one carbolyxic acid. More precisely, it discloses an improvement in adipic acid crystallization or recrystallization, characterised in that the ... | 03/25/2003 |
| 6534679 | Lactic acid processing; methods; arrangements; and, products The techniques for processing lactic acid/lactate salt mixtures are provided. Preferred mixtures for processing are obtained from fermentation broths, preferably from fermentation processes conducted at a pH of 4.8 or lower. The techniques generally conce... | 03/18/2003 |
| 6534680 | Dicarboxylic acid crystallizates Dicarboxylic acid crystals are prepared from a solution containing at least one organic dicarboxylic acid in a process in which at least one anionic polyelectrolyte having a molecular weight of at least 2000 is added to the solution before or during the c... | 03/18/2003 |
| 6515171 | Process for separating an oxidation reaction product and an oxidation catalyst An oxidation reaction mixture (e.g. adipic acid, benzoic acid, butenediol) and an oxidation catalyst are efficiently separated from a reaction mixture with the use of an aqueous solvent (e.g. methyl benzoate, benzonitrile) containing at least water (e.g. ... | 02/04/2003 |
| 6482438 | Apparatus and process for preparing crystalline particles There is provided according to the present invention a process for preparing crystalline particles, especially particles of a pharmaceutical or carrier substance suitable for inhalation therapy, in addition to apparatus for the preparation of such particl... | 11/19/2002 |
| 6433220 | Methods of extracting catalyst from a reaction mixture in the oxidation of cyclohexane to adipic acid This invention relates to methods of controlling the oxidation of cyclohexane to adipic acid in the presence of a monobasic acid solvent, by extracting the catalyst from the reaction mixture, outside the reaction zone. Substantially all the unreacted cycl... | 08/13/2002 |
| 6433221 | Methods of separating catalyst in solution from a reaction mixture produced by oxidation of cyclohexane to adipic acid This invention relates to methods of controlling the oxidation of cyclohexane to adipic acid in the presence of a monobasic acid solvent, by separating the catalyst from the reaction mixture, outside the reaction zone. Substantially all the unreacted cycl... | 08/13/2002 |
| 6417128 | Methods and replacing water and cyclohexanone with acetic acid in aqueous solutions of catalyst This invention relates to methods of replacing water and cyclohexanone with acetic acid in an aqueous solution of catalyst, preferably a cobalt compound. Such an aqueous solution is produced by extracting catalyst with water from a cyclohexanone/water sol... | 07/09/2002 |
| 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 |
| 6376223 | Process for purifying polycarboxylic acids Polycarboxylic acids are purified by contacting a crude polycarboxylic acid with a solvent to produce a substantially pure polycarboxylic acid. The solvent is chosen so that the impurities are soluble in the solvent and the polycarboxylic acid is insolubl... | 04/23/2002 |
| 6362368 | Method of producing dicarboxylic acids suitable for synthesis of polymers or polyamides A method is described for producing saturated dicarboxylic acids with a chain length of C6 to C21 or the corresponding diamidic dicarboxylic acids from fatty acid cleavage of unsaturated fatty acids or the bis-fatty acid diamides of these unsaturated fatt... | 03/26/2002 |
| 6320077 | Lactic acid processing; methods; arrangements; and, product The techniques for processing lactic acid/lactate salt mixtures are provided. Preferred mixtures for processing are obtained from fermentation broths, preferably from fermentation processes conducted at a pH of 4.8 or lower. The techniques generally conce... | 11/20/2001 |
| 6294689 | Methods for removing catalyst after oxidation of hydrocarbons This invention relates to oxidative methods for controlling the oxidation of a class of compounds, including hydrocarbons, such as cyclohexane for example, alcohols, such as cyclohexanol for example, ketones, such as cyclohexanone for example, and peroxid... | 09/25/2001 |
| 6288275 | Separation and purification of carboxylic acids from fermentation broths Carboxylic acids, particularly dicarboxylic acids, are separated from a fermentation broth by adjusting the pH of the fermentation broth to about 2.0 or below, and then heating the broth to a temperature sufficient to cause formation of three immiscible p... | 09/11/2001 |
| 6258980 | Production of metal salts There is described a process for the production of a substantially anhydrous salt of an organic acid which comprises reacting a basic compound of a metal with the appropriate organic acid, removing a substantial proportion of water present so as to produc... | 07/10/2001 |
| 6248797 | Supercritical carbon dioxide extraction of contaminants from ion exchange resins A method for extracting leachable contaminants from ion exchange resins comprises exposing the resin to supercritical carbon dioxide for a sufficient interval of time to allow at least a portion of the leachable contaminant to be solubilized by the superc... | 06/19/2001 |
| 6245942 | Reduction of the carbonyl value of carboxylic acids and derivatives of carboxylic acids and derivatives of carboxylic acids A method for reducing the carbonyl value of a composition containing carboxylic acid or carboxylic acid derivative includes contacting the composition containing carboxylic acid or carboxylic acid derivative with an amount of a catalyst and active methyle... | 06/12/2001 |
| 6232495 | Methods for treating cobalt catalyst in oxidation mixtures resulting from oxidation of hydrocarbons to dibasic acids This invention relates to methods and reactor devices for controlling the oxidation of hydrocarbons to dibasic acids, in the presence of a cobalt catalyst and a monobasic acid, such as acetic acid, by treating the catalyst from the reaction mixture, outsi... | 05/15/2001 |
| 6229046 | Lactic acid processing methods arrangements and products The techniques for processing lactic acid/lactate salt mixtures are provided. Preferred mixtures for processing are obtained from fermentation broths, preferably from fermentation processes conducted at a pH of 4.8 or lower. The techniques generally conce... | 05/08/2001 |
| 6222069 | Method for purifying adipic acid in water The invention discloses a method for purifying adipic acid in water. More precisely it discloses an improvement in adipic acid crystallization or recrystallization in water, characterised in that the said crystallization or recrystallization is effected i... | 04/24/2001 |
