| Patent Number |
Title Of Patent |
Date Issued |
| 7615663 |
Optimized production of aromatic dicarboxylic acids |
November 10, 2009 |
| Disclosed is an optimized process and apparatus for more efficiently producing and purifying aromatic dicarboxylic acids (e.g., terephthalic acid). The optimized system employs at least one zoned slurry concentrator to enhance purification of the aromatic dicarboxylic acid. |
| 7601795 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester productio |
October 13, 2009 |
| The present invention relates to a process by which a carboxylic acid/diol mixture is obtained from a slurry or cake carboxylic acid product without isolation of a substantially dry carboxylic acid solid. More specifically, the present invention relates to a process by which a tereph |
| 7569722 |
Process for removal of benzoic acid from an oxidizer purge stream |
August 4, 2009 |
| A process is disclosed that relates to the removal of impurities, specifically benzoic acid, from a mother liquor produced in the synthesis of carboxylic acid, typically terephthalic acid. |
| 7568361 |
Optimized liquid-phase oxidation |
August 4, 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 |
| 7556784 |
Optimized production of aromatic dicarboxylic acids |
July 7, 2009 |
| Disclosed is an optimized process and apparatus for more efficiently and economically producing aromatic discarboxylic acids. The process reduces costs associated with hydrogenation by forming a final composite product containing unhydrogenated acid particles. |
| 7546747 |
Process for production of a dried carboxylic acid cake suitable for use in polyester production |
June 16, 2009 |
| The present invention relates to a process by which a dried carboxylic acid cake is obtained from a slurry or cake carboxylic acid product through the use of at least one counter current wash. More specifically, the present invention relates to a process by which a dried terephthalic |
| 7504535 |
Optimized liquid-phase oxidation |
March 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 |
| 7494641 |
Extraction process for removal of impurities from an oxidizer purge stream in the synthesis of c |
February 24, 2009 |
| Disclosed is a process that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic acid. The process involves the addition of a wash solution to a high temperature molten dispersion to recover the |
| 7470370 |
Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using p |
December 30, 2008 |
| A process is disclosed that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves recovery of a metal catalyst from an oxidizer purge stream through the u |
| 7452522 |
Extraction process for removal of impurities from an oxidizer purge stream in the synthesis of c |
November 18, 2008 |
| Disclosed is a process that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic acid. The process involves the addition of a wash solution to a high temperature molten dispersion to recover the |
| 7410632 |
Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic a |
August 12, 2008 |
| A method for removing impurities from a mother liquor comprising a carboxylic acid, a metal catalyst, impurities by (a) evaporating the mother liquor comprising a carboxylic acid, the metal catalyst, impurities, water and a solvent in a first evaporator zone to produce a vapor stream |
| 7402694 |
Process for removal of benzoic acid from an oxidizer purge stream |
July 22, 2008 |
| A process is disclosed that relates to the removal of impurities, specifically benzoic acid, from a mother liquor produced in the synthesis of carboxylic acid, typically terephthalic acid. |
| 7393973 |
Polycarboxylic acid production system with enhanced residence time distribution for oxidative di |
July 1, 2008 |
| Disclosed is an optimized system for more efficiently and economically producing terephthalic acid. The system includes an oxidative digestion reactor/zone configured to provide optimized residence time distribution for the solid and liquid phases of the reaction medium processed therein |
| 7381386 |
Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic a |
June 3, 2008 |
| A method for removing impurities from a mother liquor comprising a carboxylic acid, a metal catalyst, impurities by (a) evaporating the mother liquor comprising a carboxylic acid, a metal catalyst, impurities and a solvent in a first evaporator zone to produce a vapor stream and a co |
| 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 |
| 7351396 |
Extraction process for removal of impurities from an aqueous mixture |
April 1, 2008 |
| A method for removing impurities from an aqueous mixture or purified aqueous by extracting the aqueous mixture or purified aqueous mixture with an extraction solvent in an extraction zone to form an extract stream and the raffinate stream; and optionally separating the extract stream |
| 7342128 |
Method for oxidizing a slurry composition in a post oxidation zone in the presence of added stea |
March 11, 2008 |
| The present invention relates to a process for oxidizing a slurry composition in a post oxidation zone in the presence of added steam. More specifically, the present invention relates to a process for oxidizing a crude terephthalic acid composition in a post oxidation zone in the pre |
| 7339072 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester productio |
March 4, 2008 |
| In this invention, a process is provided by which a carboxylic acid/diol mixture suitable as starting material for a polyester production is obtained from a decolorized carboxylic acid solution without isolation of a substantially dry carboxylic acid solid. More specifically, in this |
| 7326807 |
Polycarboxylic acid production system with enhanced heating for oxidative digestion |
February 5, 2008 |
| Disclosed is an optimized system for more efficiently and economically producing terephthalic acid. The system includes an novel method for heating the slurry and/or reaction medium subjected to oxidative digestion. |
| 7282151 |
Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using p |
October 16, 2007 |
| A process is disclosed that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves recovery of a metal catalyst from an oxidizer purge stream through the u |
| 7276625 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester productio |
October 2, 2007 |
| In this invention, a process is provided by which a carboxylic acid/diol mixture suitable as starting material for a polyester production is obtained from a decolorized carboxylic acid solution without isolation of a substantially dry carboxylic acid solid. More specifically, in this |
| 7226986 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester productio |
June 5, 2007 |
| The present invention relates to a process by which a carboxylic acid/diol mixture is obtained from a carboxylic acid/solvent slurry without isolation of a substantially dry carboxylic acid solid. More specifically, the present invention relates to a process by which a terephthalic a |
| 7214760 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester productio |
May 8, 2007 |
| The present invention relates to a process by which a carboxylic acid/diol mixture is obtained from a slurry or cake carboxylic acid product without isolation of a substantially dry carboxylic acid solid. More specifically, the present invention relates to a process by which a tereph |
| 7213540 |
Steam recompression in carboxylic acid processes |
May 8, 2007 |
| Disclosed is a method for the re-compression of process generated steam to create a higher pressure steam that is useful as a heating medium in other parts of a carboxylic acid production process or, in general utilized in another process. The invention comprises the following basic |
| 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 |
| 7193109 |
Process for production of a carboxylic acid/diol mixture suitable for use in polyester productio |
March 20, 2007 |
| The present invention relates to a process by which a carboxylic acid/diol mixture is obtained from a carboxylic acid/solvent slurry without isolation of a substantially dry carboxylic acid solid. More specifically, the present invention relates to a process by which a terephthalic a |
| 7161027 |
Process for the oxidative purification of terephthalic acid |
January 9, 2007 |
| 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 purified carboxylic acid slurry is further cooled in a cooli |
| 7132566 |
Process for the purification of a crude carboxylic acid slurry |
November 7, 2006 |
| Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a slurry product. The slurry product if further treated in a staged oxidation zone and a cry |
| 7074954 |
Process for the oxidative purification of terephthalic acid |
July 11, 2006 |
| 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 |
| 7049465 |
Process for energy recovery in processes for the preparation of aromatic carboxylic acids |
May 23, 2006 |
| 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 |
| 6762276 |
Hydrogenation of polyester oligomers containing terephthalic acid residues |
July 13, 2004 |
| Disclosed is a process of hydrogenating a polyester oligomer containing terephthalic acid residues wherein terephthalic acid residues are converted to residues of 1,4-cyclohexanedicarboxylic acid. Also disclosed is a process for the preparation of polyesters containing 1,4-cyclohexan |
| 6689903 |
Crystallization method for production of purified aromatic dicarboxylic acids |
February 10, 2004 |
| Disclosed is a method for the recovery of crystalline terephthalic acid containing less than about 150 ppmw p-toluic acid by subjecting a solution of terephthalic acid containing minor amounts of p-toluic acid to crystallization in a crystallization zone comprising a plurality of ser |
| 6504051 |
Process for production of aromatic carboxylic acids with improved water removal technique |
January 7, 2003 |
| Disclosed is an improved process for the continuous production of aromatic carboxylic acids by the liquid-phase oxidation of an alkyl aromatic compound with an oxygen-containing gas in the presence of oxidation catalyst which results in reduced wastewater generation, reduced condensi |
| 6469206 |
Process for the preparation of triflic anhydride |
October 22, 2002 |
| Disclosed is a process for the preparation of trifluoromethanesulfonic acid anhydride by the steps of (1) forming a mixed anhydride comprising a trifluoromethanesulfonyl acyl residue and a carboxyl residue by contacting trifluoromethanesulfonic acid or a derivative thereof with a carboxy |
| 6248923 |
Process for the production of fluorocarboxylic acid anhydrides |
June 19, 2001 |
| Disclosed is process for the production of symmetrical fluoro-substituted anhydrides from mixed or unsymmetrical anhydrides, i.e., wherein the two carboxylic acid acyl groups of the anhydrides are different, by subjecting an unsymmetrical anhydrides to reactive distillation to produce a |
| 6218555 |
Process for the preparation of alkanoyloxy-benzenesulfonic acids and salts thereof |
April 17, 2001 |
| Disclosed is a process for the preparation of alkanoate esters of hydroxybenzenesulfonic acids and salts thereof by the steps of (1) contacting or reacting phenol with an alkanoic acid in the presence of trifluoroacetic acid (TFA) and trifluoroacetic anhydride (TFAA) to produce a ary |
| 5510521 |
Process for the production of aromatic carboxylic acids |
April 23, 1996 |
| Disclosed is an improved process for the continuous production of aromatic carboxylic acids by the liquid-phase oxidation of an alkyl aromatic compound with an oxygen-containing gas in the presence of oxidation catalyst which effectively utilizes the heat of reaction in the process of |
