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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...
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7915447 |
Process for producing succinic acid
The present invention is intended to provide a process capable of efficiently producing highly purified succinic acid from an alkali metal succinate by a simple separation and purification process....
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7896944 |
Method for extracting fulvic acid molecules
Methods for extracting molecules of fulvic acid from a humus material such as oxidized lignite are disclosed. The humus material is mixed with water to solubilize at least some of the fulvic acid...
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7504536 |
Compositions comprising calcium citrate malate and methods for making the same
A process for producing a calcium citrate malate composition by the steps of: combining a calcium source, a citrate source, a malate source and water to form a calcium citrate malate mixture. The...
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7470370 |
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...
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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...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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6600070 |
Methods for making 2-(&ohgr -alkoxycarbonylalkanoyl)-4-butanolide, ester of &ohgr -hydroxy-(&ohgr -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, ...
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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...
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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...
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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...
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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....
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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,...
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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,...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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6218574 |
Process for purifying long-chain dicarboxylic acid
The present invention relates to an aqueous phase process for purifying long-chain dicarboxylic acids from a liquid containing a long-chain dicarboxylic acid/or a salt thereof. The invention...
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6063958 |
Method of recovering adipic acid and 6-hydroxycaproic acid from waste solution of alkali metal salts of organic acids coming from the process of cyclohexane oxidation
A method of recovering adipic acid and 6-hydroxycaproic acid from the waste solution of alkali metal salts of organic acids coming from the process of cyclohexane oxidation, which comprises: (i)...
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5981798 |
Preparation of a crystalline solid from glycine-N,N-diacetic acid derivatives with sufficiently low hygroscopicity
A crystalline solid which has a sufficiently low hygroscopicity for processing and use and essentially consists of glycine-N,N-diacetic acid derivatives is prepared by adjusting the water content...
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5929277 |
Methods of removing acetic acid from cyclohexane in the production of adipic acid
This invention relates to methods of removing acetic acid from cyclohexane in the direct oxidation of cyclohexane to adipic acid, especially after recycling catalyst which is precipitated by...
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5900506 |
Method of processing reaction mixtures obtained from the oxidation of cyclohexane
The present invention relates to a method of processing reaction mixtures obtained from the oxidation reaction of cyclohexane to adipic acid. The processing of the reaction mixture obtained from...
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5780704 |
Process for treating plastic product
A process for decomposing a thermoplastic polymer composition which comprises a polyhydroxycarboxylic acid base polymer as a primary component in an alkaline solution, recovering hydroxycarboxylic...
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5780276 |
Recovery of carboxylic acid from organic solution that contains an amine and an extraction enhancer
Recovery of carboxylic acid from an amine-based, water-immiscible organic extractant solution thereof that contains an enhancer, by extraction of the acid into an aqueous phase. A low molecular, at...
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5766439 |
Production and recovery of organic acids
A process is described for producing organic acids such as lactic acid. The process includes the steps of producing lactic acid by fermentation, resulting in an aqueous fermentation broth...
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5756837 |
Method of recycling a catalyst in a reaction involving the direct oxidation of cyclohexane into adipic acid
A process for recycling a catalyst containing cobalt including treating a reaction mixture obtained during the direct oxidation of cyclohexane to adipic acid by extracting at least some of the...
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5731467 |
Process for the manufacture of xylaric acid and uses thereof
Process for the manufacture of xylaric acid, characterized in that it consists of the oxidative degradation of 5-ketogluconic acid in alkaline medium using oxygen or a gas containing it.The xylaric...
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5681728 |
Method and apparatus for the recovery and purification of organic acids
The present invention relates to methods and apparatus for reducing the fouling of ion-selective membranes used in the electrodialytic purification of organic acids. More particularly, the present...
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5599977 |
Oxidation process
Rapid temperature rises which characterize carbohydrate-nitric acid oxidation reactions used to form carbohydrate-derived acids may be moderated and temperature control readily maintained by...
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5587511 |
Process for obtaining adipic acid
The present invention relates to a process for obtaining adipic acid from the aqueous nitric acid mother liquors that arise during industrial adipic acid production by (i) removing nitric acid from...
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5587056 |
Separation of aliphatic diacids from adipic acid admixtures thereof
At least a fraction of at least one branched, saturated aliphatic diacid having 6 carbon atoms, for example 2-methylglutaric acid and/or 2-ethylsuccinic acid and/or dimethylsuccinic acid, is...
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5543564 |
Process for releasing acidic organic compounds from salts thereof by carbon dioxide
This invention embodies a process for releasing acidic organic compounds in high yield and good purity from aqueous solutions of their salts which comprises converting the salts by carbon dioxide...
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