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Class Information
Number: 562/593
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Carboxylic acids and salts thereof > Acyclic > Polycarboxylic > Purification or recovery per se
Description: Processes directed to the purification, separation, or recovery of acyclic polycarboxylic acids.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7504536 |
Compositions comprising calcium citrate malate and methods for making the same |
Mar. 17, 2009 |
| 7470370 |
Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using pressure filtration |
Dec. 30, 2008 |
| 7411090 |
Process for the recovery of citric acid |
Aug. 12, 2008 |
| 7371890 |
Method for the continuous production of a compound that carries at least two functional groups |
May. 13, 2008 |
| 7282151 |
Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using pressure filtration |
Oct. 16, 2007 |
| 7253312 |
Process for producing carboxylic acids |
Aug. 7, 2007 |
| 7217837 |
Method for producing organic acid |
May. 15, 2007 |
| 7144977 |
Lactic acid processing; methods; arrangements; and, products |
Dec. 5, 2006 |
| 7084300 |
Work-up of residues in the preparation of carboxylic acids |
Aug. 1, 2006 |
| 7019170 |
Process for the recovery of lactic acid by contacting aqueous solutions containing the same with a basic organic extractant |
Mar. 28, 2006 |
| 6946571 |
Drying of adipic acid |
Sep. 20, 2005 |
| 6946572 |
Crystallization of adipic acid from its solution in aqueous nitric acid |
Sep. 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 |
Aug. 9, 2005 |
| 6903235 |
Pharmaceutical-grade ferric citrate |
Jun. 7, 2005 |
| 6822117 |
Method for making adipic acid |
Nov. 23, 2004 |
| 6667417 |
Process for the recovery of lactic acid |
Dec. 23, 2003 |
| 6627768 |
Process for recovery of acid |
Sep. 30, 2003 |
| 6600070 |
Methods for making 2-(.omega.-alkoxycarbonylalkanoyl)-4-butanolide, ester of .omega.-hydroxy-(.omega.-3)-ketoaliphatic acid, and derivatives thereof |
Jul. 29, 2003 |
| 6559339 |
Method for crystallizing carboxylic acid |
May. 6, 2003 |
| 6538156 |
Method for purifying adipic acid by crystallization |
Mar. 25, 2003 |
| 6534680 |
Dicarboxylic acid crystallizates |
Mar. 18, 2003 |
| 6534679 |
Lactic acid processing; methods; arrangements; and, products |
Mar. 18, 2003 |
| 6515171 |
Process for separating an oxidation reaction product and an oxidation catalyst |
Feb. 4, 2003 |
| 6482438 |
Apparatus and process for preparing crystalline particles |
Nov. 19, 2002 |
| 6433220 |
Methods of extracting catalyst from a reaction mixture in the oxidation of cyclohexane to adipic acid |
Aug. 13, 2002 |
| 6433221 |
Methods of separating catalyst in solution from a reaction mixture produced by oxidation of cyclohexane to adipic acid |
Aug. 13, 2002 |
| 6417128 |
Methods and replacing water and cyclohexanone with acetic acid in aqueous solutions of catalyst |
Jul. 9, 2002 |
| 6376709 |
Process for the crystallization of dicarboxylic acids |
Apr. 23, 2002 |
| 6376223 |
Process for purifying polycarboxylic acids |
Apr. 23, 2002 |
| 6362368 |
Method of producing dicarboxylic acids suitable for synthesis of polymers or polyamides |
Mar. 26, 2002 |
| 6320077 |
Lactic acid processing; methods; arrangements; and, product |
Nov. 20, 2001 |
| 6294689 |
Methods for removing catalyst after oxidation of hydrocarbons |
Sep. 25, 2001 |
| 6288275 |
Separation and purification of carboxylic acids from fermentation broths |
Sep. 11, 2001 |
| 6258980 |
Production of metal salts |
Jul. 10, 2001 |
| 6248797 |
Supercritical carbon dioxide extraction of contaminants from ion exchange resins |
Jun. 19, 2001 |
| 6245942 |
Reduction of the carbonyl value of carboxylic acids and derivatives of carboxylic acids and derivatives of carboxylic acids |
Jun. 12, 2001 |
| 6232495 |
Methods for treating cobalt catalyst in oxidation mixtures resulting from oxidation of hydrocarbons to dibasic acids |
May. 15, 2001 |
| 6229046 |
Lactic acid processing methods arrangements and products |
May. 8, 2001 |
| 6222069 |
Method for purifying adipic acid in water |
Apr. 24, 2001 |
| 6218574 |
Process for purifying long-chain dicarboxylic acid |
Apr. 17, 2001 |
| 6143927 |
Methods for removing catalyst after oxidation of hydrocarbons |
Nov. 7, 2000 |
| 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 |
May. 16, 2000 |
| 5981798 |
Preparation of a crystalline solid from glycine-N,N-diacetic acid derivatives with sufficiently low hygroscopicity |
Nov. 9, 1999 |
| 5929277 |
Methods of removing acetic acid from cyclohexane in the production of adipic acid |
Jul. 27, 1999 |
| 5900506 |
Method of processing reaction mixtures obtained from the oxidation of cyclohexane |
May. 4, 1999 |
| 5780276 |
Recovery of carboxylic acid from organic solution that contains an amine and an extraction enhancer |
Jul. 14, 1998 |
| 5780704 |
Process for treating plastic product |
Jul. 14, 1998 |
| 5766439 |
Production and recovery of organic acids |
Jun. 16, 1998 |
| 5756837 |
Method of recycling a catalyst in a reaction involving the direct oxidation of cyclohexane into adipic acid |
May. 26, 1998 |
| 5731467 |
Process for the manufacture of xylaric acid and uses thereof |
Mar. 24, 1998 |
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