| Patent Number |
Title Of Patent |
Date Issued |
| 7566802 |
Process for energy recovery and water removal in the preparation of aromatic carboxylic acids |
July 28, 2009 |
| This invention relates to a process for the manufacture of aromatic carboxylic acids by exothermic liquid phase oxidation of an aromatic feedstock. More particularly, this invention relates to the efficient energy recovery of the exotherm produced by the liquid phase oxidation of an |
| 7557243 |
Enriched terephthalic acid composition |
July 7, 2009 |
| A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the |
| 7501537 |
Polycarboxylic acid production system employing oxidative digestion with reduced or eliminated u |
March 10, 2009 |
| Disclosed is an optimized system for more efficiently and economically producing terephthalic acid. The system minimizes or eliminates the need for liquor exchange upstream of oxidative digestion and/or upstream of substantial cooling of the TPA-containing slurry. |
| 7491369 |
Oxidation system with internal secondary reactor |
February 17, 2009 |
| Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low |
| 7485747 |
Two stage oxidation process for the production of aromatic dicarboxylic acids |
February 3, 2009 |
| Disclosed is a process for producing a benzenedicarrboxylic acid such as terephthalic acid wherein a dialkyl benzene compound and acetic acid having catalyst components dissolved therein are fed to a first reaction zone wherein the dialkyl benzene compound is oxidized with molecular |
| 7432395 |
Enriched carboxylic acid composition |
October 7, 2008 |
| A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the |
| 7420082 |
Polycarboxylic acid production system employing hot liquor removal downstream of oxidative diges |
September 2, 2008 |
| Disclosed is an optimized system for more efficiently and economically producing terephthalic acid. The system includes an optimized post-digestion cooling stage that provides a TPA product having enhanced purity, while minimizing costs associated with removing impurities from recycl |
| 7358392 |
Process for the oxidative purification of terephthalic acid |
April 15, 2008 |
| Disclosed is a process to produce a purified carboxylic acid slurry. The process comprises removing impurities from a crystallized product in a solid liquid displacement zone to form the purified carboxylic acid slurry. The process produces purified carboxylic acid slurry having good |
| 7358389 |
Oxidation system employing internal structure for enhanced hydrodynamics |
April 15, 2008 |
| Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low |
| 7355068 |
Oxidation system with internal secondary reactor |
April 8, 2008 |
| Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low |
| 7326808 |
Polycarboxylic acid production system employing cooled mother liquor from oxidative digestion as |
February 5, 2008 |
| Disclosed is an optimized system for more efficiently and economically producing terephthalic acid. A solvent purification system is employed to remove of at least one aromatic impurity present in a solvent purification feed. At least about 20 weight percent of the solvent purificati |
| 7196215 |
Process for the production of purified terephthalic acid |
March 27, 2007 |
| Disclosed is a process for the production of terephthalic acid by a plurality of process steps including the catalyst oxidation of a dialkylbenzene compound, a second oxidation, a hydrogenation of the product of the second oxidation, and crystallization of the hydrogenation terephtha |
| 6380352 |
Polyester precursor purification process |
April 30, 2002 |
| Disclosed is a process for the purification of a polyester precursor wherein a polyester oligomer derived from terephthalic acid and one or more glycols or diols is purified or decolorized by hydrogenating the oligomer to convert colored impurities to colorless compounds and thereby |
