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Class Information
Number: 562/486
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 crystallization
Description: Processes wherein the purification or recovery involves a significant crystallization step.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7589230 |
Process for the preparation of diphenic acid |
Sep. 15, 2009 |
| 7541417 |
Process for the purification of dihydric phenols |
Jun. 2, 2009 |
| 7528210 |
Method of purification of dihydric phenols |
May. 5, 2009 |
| 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 |
| 7342128 |
Method for oxidizing a slurry composition in a post oxidation zone in the presence of added steam |
Mar. 11, 2008 |
| 7307188 |
Purification of carboxylic acids by complexation with selective solvents |
Dec. 11, 2007 |
| 7196215 |
Process for the production of purified terephthalic acid |
Mar. 27, 2007 |
| 7173150 |
Process for recovering terephthalic acid from pulverized product of spent polyethylene terephthalate and system for use in such process |
Feb. 6, 2007 |
| 7161027 |
Process for the oxidative purification of terephthalic acid |
Jan. 9, 2007 |
| 7153998 |
Method for refining 2,6-naphthalene dicarboxylic acid |
Dec. 26, 2006 |
| 7132566 |
Process for the purification of a crude carboxylic acid slurry |
Nov. 7, 2006 |
| 7102029 |
Method of crystallization |
Sep. 5, 2006 |
| 7074954 |
Process for the oxidative purification of terephthalic acid |
Jul. 11, 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 |
| 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 |
| 6689903 |
Crystallization method for production of purified aromatic dicarboxylic acids |
Feb. 10, 2004 |
| 6670503 |
Method for recovery of terephthalic acid from a material containing poly(ethylene terephthalates) |
Dec. 30, 2003 |
| 6639104 |
Process for the recovery of purified terephthalic acid (PTA) |
Oct. 28, 2003 |
| 6579990 |
Process for producing refined pyromellitic acid and refined pyromellitic anhydride |
Jun. 17, 2003 |
| 6580005 |
Process for recovering terephthalic acid from pulverized product of spent polyethylene terephthalate and system for use in such process |
Jun. 17, 2003 |
| 6534677 |
Non-crushable, non-friable, non-breakable carbon catalyst supports |
Mar. 18, 2003 |
| 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 |
| 6452047 |
Process for producing highly pure aromatic polycarboxylic acid |
Sep. 17, 2002 |
| 6441225 |
Purification of aromatic diacids |
Aug. 27, 2002 |
| 6426430 |
Method for reduction of potassium in an integrated process for the production of 2,6--NDA |
Jul. 30, 2002 |
| 6407286 |
Process for recovering hydrogen in producing pure terephthalic acid |
Jun. 18, 2002 |
| 6392091 |
Process of purifying and producing high purity aromatic polycarboxylic acids |
May. 21, 2002 |
| 6310239 |
Process for manufacturing terephthalic acid |
Oct. 30, 2001 |
| 6294689 |
Methods for removing catalyst after oxidation of hydrocarbons |
Sep. 25, 2001 |
| 6291707 |
Process of purifying and producing high purity aromatic polycarboxylic acids and derivatives thereof |
Sep. 18, 2001 |
| 6284920 |
Aromatic acid monomers, polymers, products and processes for their manufacture |
Sep. 4, 2001 |
| 6258980 |
Production of metal salts |
Jul. 10, 2001 |
| 6255525 |
Process for preparing purified carboxylic acids |
Jul. 3, 2001 |
| 6245939 |
Process for producing highly pure aromatic carboxylic acids |
Jun. 12, 2001 |
| 6194609 |
Crystallization in a plate heat exchanger |
Feb. 27, 2001 |
| 6162948 |
Naphthalenedicarboxylic acid particles and process for the production thereof |
Dec. 19, 2000 |
| 6143927 |
Methods for removing catalyst after oxidation of hydrocarbons |
Nov. 7, 2000 |
| 6140534 |
Method for purifying isophthalic acid prepared from metaxylene |
Oct. 31, 2000 |
| 6133476 |
Process for purification of aromatic polycarboxylic acids |
Oct. 17, 2000 |
| 6075163 |
Process for manufacturing terephthalic acid |
Jun. 13, 2000 |
| 6034269 |
Process for producing pure carboxylic acids |
Mar. 7, 2000 |
| 6031128 |
Process for manufacturing terephthalic acid |
Feb. 29, 2000 |
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