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7439392 |
Separation of citric acid from gluconic acid in fermentation broth using a weakly or strongly basic anionic exchange resin adsorbent
Citric acid is separated from a fermentation broth containing gluconic acid by using an adsorbent comprising a water-insoluble, macroreticular or gel, strongly or weakly basic anionic exchange...
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7439391 |
Multi-stage glycolic acid crystallization
The present invention relates to a high yield process to prepare high purity crystalline glycolic acid using a multi-loop crystallization process characterized by high liquid and/or solid recycle,...
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7410556 |
Purification of aqueous solutions of organic acids
The invention relates to a method and a device for the purification of an aqueous solution of an organic acid having a boiling point at atmospheric pressure of less than 450° C., which further has...
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7358384 |
Processes for the recovery of optically active diacyltartaric acids
When a salt of an amine and an optically active diacyltartaric acid, or a diastereomer salt of an optically active amine and an optically active diacyltartaric acid, obtained by optically resolving...
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7332085 |
Method for the purification of an α-hydroxy acid on an industrial scale
The present invention relates to a method for the purification of an α-hydroxy acid on an industrial scale, in which the method involves: (a) subjecting an aqueous stream containing mainly...
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7279598 |
Process for separating and recovering 3-hydroxypropionic acid and acrylic acid
Disclosed is a process for separating and recovering 3-hydroxypropionic acid from an aqueous solution comprising 3-hydroxypropionic acid and acrylic acid, comprising counter current extracting the...
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7238837 |
Process for the recovery of lactic acid from aqueous lactate salt solutions, involving the use of ion exchangers
The invention provides a process for the recovery of lactic acid from aqueous solutions containing at least one water-soluble lactate salt and having a pH of about between 4 and 14, comprising the...
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7223885 |
Method for the purification of a-hydroxy acids on an industrial scale
The present invention relates to a method for the purification of an α-hydroxy acid on an industrial scale, in which an α-hydroxy acid with a color (fresh) of not more than 10,000 APHA units is...
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7208615 |
Triple mineral salts of (-)-hydroxycitric acid and processes for preparing the same
This invention relates to novel triple salts of (−)-hydroxycitric acid having the general formula 1
wherein X, Y are selected from zinc or group IIA metal and Z is selected from group IA...
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7186856 |
Process for preparing carboxylic acids and derivatives thereof
Processes for preparing carboxylic acids and derivatives thereof in which an ammonium salt of the carboxylic acid is heated in the presence of an organic reagent to split the salt and form the acid...
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7164040 |
Process for production of high-purity crystals of glycolic acid
A method for producing high purity glycolic acid crystals, which comprises the steps of: (1) providing an aqueous glycolic acid solution (A) which has (a) a water content of from 5 to 20% by...
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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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7034180 |
Method for crystallization of hydroxycarboxylic acids
The invention aims at producing high-purity crystals of a hydroxycarboxylic acid represented by the following formula (1):
in high yield.
Provided are a method for crystallization of a...
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7026507 |
Method for the production of solid formulations of sodium 3-hydroxy-3-methylbutyrate
A process for preparing solid formulations of sodium 3-hydroxy-3-methylbutyrate of the formula
in which, in a first process step, 4,4-dimethyloxetan-2-one is reacted with aqueous sodium...
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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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7002039 |
Method for the purification of an alpha-hydroxy acid on an industrial scale
The invention relates to a method for the purification of a fermentatively prepared α-hydroxy acid on an industrial scale, in which an α-hydroxy acid with a color (fresh) of not more than 10,000...
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7001625 |
Solid phase synthesis of salts of organic acids including butyric acid
A process for the solid-phase synthesis of salts of organic acids in a granular, free-flowing, and dust-free form particularly suited for use as animal feed additives. A mixture of liquid organic...
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6967257 |
Method of purifying lactic acid esters
The invention relates to a method of purifying lactic acid esters, wherein an impure lactic acid ester is subjected to a melt crystallization. The impure lactic acid contains not more than 10 wt. %...
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6951956 |
Crystalline polyglycolic acid, polyglycolic acid composition and production process thereof
Crystalline polyglycolic acid wherein a difference between the melting point Tm and the crystallization temperature Tc 2 is not lower than 35° C., and a difference between the crystallization...
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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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6903234 |
Method of making a calcium salt of 2-hydroxy-4-(mercaptomethyl) butanoic acid
A method of making calcium-2-hydroxy-4-(mercaptomethyl)butanoate includes combining and mixing 2-hydroxy-4-(mercaptomethyl)butanoic acid and a calcium salt selected from calcium oxide and calcium...
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6864389 |
Method for producing α-hydroxycarboxylic acid
The present invention relates to:
a method for producing α-hydroxycarboxylic acid, which comprises hydrolyzing cyanohydrin in the presence of a hydrocarbon solvent; a method for producing...
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6815560 |
Process for the preparation of hydroxymethylbutyric acid
The invention relates to a new process for the preparation of hydroxymethylthiobutyric acid by sulphuric hydrolysis of hydroxymethylthiobutyronitrile.
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6777213 |
Isolation of carboxylic acids from fermentation broth
A process for recovering carboxylic acids from an aqueous mixture such as a fermentation broth using a solvent containing at least one olefin without the need for first removing the spent...
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6770782 |
Process for the production of potassium hydroxy citric acid, and compositions containing the potassium hydroxy citric acid
The present invention provides a new process for the isolation of hydroxy citric acid in the form of a potassium salt from Garcinia fruit. The present invention also provides compositions...
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6670505 |
Process for the recovery of organic acids from aqueous solutions
A process for recovering a desired organic acid from a solution includes the steps of: providing an aqueous solution including at least one desired organic acid or its acid anion; adjusting the...
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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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6649794 |
Method for producing 2-Hydroxy-4-Methylthiobutanoic Acid
A method for producing a 2-hydroxy-4-methylthiobutanoic acid is provided, the method comprising the steps of: hydrolyzing a 2-hydroxy-4-methylthiobutanenitrile and/or a...
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6632966 |
Method for the preparation of lactic acid and calcium sulphate dihydrate
The invention relates to a method for the preparation of lactic acid and calcium sulphate, in which (a) an aqueous solution that contains lactate is reacted with sulphuric acid at a temperature...
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6630603 |
Method of industrial-scale purification of lactic acid
The present invention relates to a method of industrial-scale purification of lactic acid, the method including the steps of: (a) reduced-pressure distillation of a concentrated lactic acid...
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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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6562967 |
Kinetic resolutions of chiral 2-and-3-substituted carboxylic acids
One aspect of the present invention relates to a method for the kinetic resolution of racemic and diastereomeric mixtures of chiral compounds. The critical elements of the method are: a non-racemic...
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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...
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6534678 |
Process for producing tartaric acid from a raw material containing potassium hydrogentartrate
Process for producing tartaric acid from a raw material whose dry matter comprises at least 5 wt% potassium hydrogentartrate wherein the raw material containing potassium hydrogen tartrate (KHT) is...
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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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6472559 |
Lactic acid production, separation and/or recovery process
A process for the production and isolation of lactic acid is provided. A lactate feed solution, preferably obtained from a fermentation broth is combined with and extracted by a water-immiscible...
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6395926 |
Process for recovering low-boiling acids
The invention provides a method for recovering low-boiling acids from a concentrated solution of the calcium salt of the acid by treating the concentrated solution of calcium salts of the...
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6395179 |
Thermally-managed separation and dewatering processes for recovering acid products
Described are preferred processes separating desired chemical products from impurities in solution utilizing thermally-managed chromatography over solid adsorbents. The preferred processes involve...
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6384241 |
Purified salt of β-hydroxyethoxy acetic acid, purified 2-p-dioxanone, and manufacturing method therefor
A purified salt of β-hydroxyethoxy acetic acid of formula (1) having a fusion peak-top temperature detected by differential scanning calorimetry (DSC) and a purified 2-p-dioxanone of formula (2)...
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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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6316668 |
Acid sorption regeneration process using carbon dioxide
Carboxylic acids are sorbed from aqueous feedstocks onto a solid adsorbent in the presence of carbon dioxide under pressure. The acids are freed from the sorbent phase by a suitable regeneration...
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6291708 |
Process for production of organic acids and esters thereof
A process is disclosed for producing an organic acid and optionally for simultaneously producing an ester of the organic acid. The process comprises the steps of: (a) combining an aqueous diluent,...
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6262313 |
Thermal conversion of fatty acid salts to ketones
This invention provides a method for thermally converting volatile fatty acid (VFA) salts to ketones by mixing dry calcium salts of VFAs with hot heat transfer agent in an evacuated container,...
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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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6245538 |
Process for recovering carboxylic acids from a fermentation broth
Carboxylic acids are recovered from a fermentation broth by adjusting the pH of a fermentation broth comprised of a carboxylic acid to at least about 6.0 and then heating the pH-adjusted broth to a...
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6221901 |
Magnesium (-)hydroxycitrate, method of preparation, applications, and compositions in particular pharmaceutical containing same
Magnesium (-)hydroxycitrate, preparation process, dietary and therapeutic uses particularly in the cardiovascular field, and compositions in particular pharmaceutical containing it.
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6160173 |
Process for the recovery of lactic acid esters and amides from aqueous solutions of lactic acid and/or salts thereof
The invention provides a process for the recovery of purified lactic acid values from an aqueous feed solution containing lactic acid, lactic acid salt, or mixtures thereof, comprising: bringing...
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6137004 |
Processes for recovering citric acid
Described are preferred processes for recovering citric acid from a medium in which it is contained. The citric acid is recovered both effectively and in a form which is readily purifiable. In one...
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6114577 |
Desorption process and apparatus
Described are preferred processes and apparatuses for thermally desorbing desired chemical products from resins to which they are adsorbed. The processes and apparatuses provide highly efficient...
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