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Class Information
Number: 562/487
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 > By reaction of undesired component
Description: Processes wherein the purification or recovery of the acid includes the reaction of an undesired component.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7572932 |
Optimized liquid-phase oxidation |
Aug. 11, 2009 |
| 7556784 |
Optimized production of aromatic dicarboxylic acids |
Jul. 7, 2009 |
| 7485747 |
Two stage oxidation process for the production of aromatic dicarboxylic acids |
Feb. 3, 2009 |
| 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 |
| 7358392 |
Process for the oxidative purification of terephthalic acid |
Apr. 15, 2008 |
| 7351396 |
Extraction process for removal of impurities from an aqueous mixture |
Apr. 1, 2008 |
| 7339072 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
Mar. 4, 2008 |
| 7276625 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester production |
Oct. 2, 2007 |
| 7196215 |
Process for the production of purified terephthalic acid |
Mar. 27, 2007 |
| 7164038 |
Process for decolorizing aromatic dicarboxylic acids |
Jan. 16, 2007 |
| 7161027 |
Process for the oxidative purification of terephthalic acid |
Jan. 9, 2007 |
| 7098299 |
Separation of contaminants from polyester materials |
Aug. 29, 2006 |
| 7074954 |
Process for the oxidative purification of terephthalic acid |
Jul. 11, 2006 |
| 7041847 |
Method for cleaning crude terephthalic acid and catalysts suitable for the same and containing carbon fibers |
May. 9, 2006 |
| 7005540 |
Method of purifying aromatic polycarboxylic acid |
Feb. 28, 2006 |
| 6855845 |
Process for the preparing bromoisophithalic acid compound |
Feb. 15, 2005 |
| 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 |
| 6717009 |
Method for making high-purity naphthalenedicarboxylic acid |
Apr. 6, 2004 |
| 6670503 |
Method for recovery of terephthalic acid from a material containing poly(ethylene terephthalates) |
Dec. 30, 2003 |
| 6562998 |
Granules of 2-hydroxynaphthalene-3-carboxylic acid and method for preparing the same |
May. 13, 2003 |
| 6461700 |
Aromatic acid monomers, polymers, products and processes for their manufacture |
Oct. 8, 2002 |
| 6458980 |
Chelating agents and their manganic chelates |
Oct. 1, 2002 |
| 6310239 |
Process for manufacturing terephthalic acid |
Oct. 30, 2001 |
| 6284920 |
Aromatic acid monomers, polymers, products and processes for their manufacture |
Sep. 4, 2001 |
| 6265608 |
Method of purifying aromatic dicarboxylic acids |
Jul. 24, 2001 |
| 6255525 |
Process for preparing purified carboxylic acids |
Jul. 3, 2001 |
| 6245939 |
Process for producing highly pure aromatic carboxylic acids |
Jun. 12, 2001 |
| 6239310 |
Method of recovery of terephthalic acid and ethylene glycol from poly/ethylene terephthalate/wastes |
May. 29, 2001 |
| 6054610 |
Method and apparatus for preparing purified terephthalic acid and isophthalic acid from mixed xylenes |
Apr. 25, 2000 |
| 6013835 |
Method and apparatus for preparing purified terephthalic acid |
Jan. 11, 2000 |
| 5929274 |
Method to reduce carboxybenzaldehyde isomers in terephthalic acid or isophthalic acid |
Jul. 27, 1999 |
| 5895820 |
Process for the production of trimellitic acid and process for the production of trimellitic acid anhydride |
Apr. 20, 1999 |
| 5872284 |
Method for purifying crude naphthalenedicarboxylic acid |
Feb. 16, 1999 |
| 5859294 |
Process for the production of high-purity naphthalenedicarboxylic acid |
Jan. 12, 1999 |
| RE36008 |
Process for the production of terephthalic acid |
Dec. 22, 1998 |
| 5840970 |
Process for the purification of naphthalenedicarboxylic acid |
Nov. 24, 1998 |
| 5767311 |
Method and apparatus for preparing purified terephtalic acid |
Jun. 16, 1998 |
| 5728870 |
Process for preparing purified 2,6-naphthalenedicarboxylic acid |
Mar. 17, 1998 |
| 5565609 |
Method of purifying aromatic dicarboxylic acids |
Oct. 15, 1996 |
| 5563294 |
Process for preparing purified 2,6-naphthalenedicarboxylic acid |
Oct. 8, 1996 |
| 5545746 |
Method for recovery of alkali metal or alkaline-earth metal terephthalate and of alkylene glycol from polyethylene terephthalates |
Aug. 13, 1996 |
| 5527957 |
Process for the production of terephthalic acid |
Jun. 18, 1996 |
| 5457197 |
Monomer recovery from multi-component materials |
Oct. 10, 1995 |
| 5455346 |
Obtaining caprolactam by cleavage of molten polycaprolactam |
Oct. 3, 1995 |
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