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Class Information
Number: 562/485
Name: Organic compounds -- part of the class 532-570 series > Organic compounds (class 532, subclass 1) > Carboxylic acids and salts thereof > Aromatic > Polycarboxylic acids or salts thereof > Purification or recovery per se
Description: Processes which are directed to the purification, separation, or recovery of aromatic polycarboxylic acids.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7615663 |
Optimized production of aromatic dicarboxylic acids |
Nov. 10, 2009 |
| 7586002 |
Catalyst for purification of aromatic acids |
Sep. 8, 2009 |
| 7547803 |
Process for producing a high purity aromatic polycarboxylic acid |
Jun. 16, 2009 |
| 7541417 |
Process for the purification of dihydric phenols |
Jun. 2, 2009 |
| 7528210 |
Method of purification of dihydric phenols |
May. 5, 2009 |
| 7482485 |
Method for extracting slurry |
Jan. 27, 2009 |
| 7470370 |
Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using pressure filtration |
Dec. 30, 2008 |
| 7462736 |
Methods and apparatus for isolating carboxylic acid |
Dec. 9, 2008 |
| 7432395 |
Enriched carboxylic acid composition |
Oct. 7, 2008 |
| 7410632 |
Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid |
Aug. 12, 2008 |
| 7381386 |
Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid |
Jun. 3, 2008 |
| 7355071 |
Method for preparing 2,6-naphthalene dicarboxylic acid |
Apr. 8, 2008 |
| 7342128 |
Method for oxidizing a slurry composition in a post oxidation zone in the presence of added steam |
Mar. 11, 2008 |
| 7339072 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
Mar. 4, 2008 |
| 7314954 |
System and method for recovering PTA mother liquid and purifying and regenerating of catalyst |
Jan. 1, 2008 |
| 7304178 |
Enriched isophthalic acid composition |
Dec. 4, 2007 |
| 7285677 |
System and method for recovering CTA residues and purifying/regenerating catalyst |
Oct. 23, 2007 |
| 7282151 |
Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using pressure filtration |
Oct. 16, 2007 |
| 7276625 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
Oct. 2, 2007 |
| 7226986 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
Jun. 5, 2007 |
| 7196215 |
Process for the production of purified terephthalic acid |
Mar. 27, 2007 |
| 7193109 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
Mar. 20, 2007 |
| 7173150 |
Process for recovering terephthalic acid from pulverized product of spent polyethylene terephthalate and system for use in such process |
Feb. 6, 2007 |
| 7135596 |
Method of removing iron contaminants from liquid streams during the manufacture and/or purification of aromatic acids |
Nov. 14, 2006 |
| 7132566 |
Process for the purification of a crude carboxylic acid slurry |
Nov. 7, 2006 |
| 7102029 |
Method of crystallization |
Sep. 5, 2006 |
| 7098299 |
Separation of contaminants from polyester materials |
Aug. 29, 2006 |
| 7019170 |
Process for the recovery of lactic acid by contacting aqueous solutions containing the same with a basic organic extractant |
Mar. 28, 2006 |
| 7005540 |
Method of purifying aromatic polycarboxylic acid |
Feb. 28, 2006 |
| 6972342 |
Method for producing crystalline carboxylic acids |
Dec. 6, 2005 |
| 6833472 |
Process for the purification of aromatic carboxylic acids |
Dec. 21, 2004 |
| 6818132 |
Method and device for separating solids from a liquid phase |
Nov. 16, 2004 |
| 6765113 |
Production of aromatic carboxylic acids |
Jul. 20, 2004 |
| 6756509 |
Method for purifying crude 2,6-naphthalenedicarboxylic acid |
Jun. 29, 2004 |
| 6753290 |
Catalytic composition, method for manufacturing thereof and method for the purification of terephthalic acid |
Jun. 22, 2004 |
| 6747171 |
Low temperature purification of naphthalene dicarboxylic acids |
Jun. 8, 2004 |
| 6723873 |
Production of terephthalic acid and ethylene glycol from polyethlene terephthalate by ammoniolysis |
Apr. 20, 2004 |
| 6720448 |
Method of recovering chemical species by depolymerization of poly (ethylene terephthalate) and related use |
Apr. 13, 2004 |
| 6670503 |
Method for recovery of terephthalic acid from a material containing poly(ethylene terephthalates) |
Dec. 30, 2003 |
| 6667417 |
Process for the recovery of lactic acid |
Dec. 23, 2003 |
| 6667419 |
Method for absorption of acrylic compound and apparatus therefor |
Dec. 23, 2003 |
| 6642412 |
Process for producing a high purity aromatic polycarboxylic acid |
Nov. 4, 2003 |
| 6639104 |
Process for the recovery of purified terephthalic acid (PTA) |
Oct. 28, 2003 |
| 6580005 |
Process for recovering terephthalic acid from pulverized product of spent polyethylene terephthalate and system for use in such process |
Jun. 17, 2003 |
| 6562999 |
Process for separation of crude naphthalene dicarboxylic acid using reverse osmosis |
May. 13, 2003 |
| 6515170 |
Enzymatic oxidative deamination process |
Feb. 4, 2003 |
| 6462230 |
Method of and apparatus for decomposing wastes |
Oct. 8, 2002 |
| 6461700 |
Aromatic acid monomers, polymers, products and processes for their manufacture |
Oct. 8, 2002 |
| 6455731 |
Process for producing a high purity aromatic polycarboxylic acid |
Sep. 24, 2002 |
| 6441225 |
Purification of aromatic diacids |
Aug. 27, 2002 |
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