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| Number | Title | Issue Date |
| 7863483 | Carboxylic acid production process Disclosed are processes and apparatus for producing a carboxylic acid. The processes employ a concentration section disposed before and/or after a product isolation section, which allows for oxidation byproducts produced in the process to exit the product isolation ... | 01/04/2011 |
| 7847121 | Carboxylic acid production process Disclosed are processes and apparatus for producing a carboxylic acid. The processes employ a concentration section disposed before and/or after a product isolation section, which allows for oxidation byproducts produced in the process to exit the product isolation ... | 12/07/2010 |
| 7615663 | Optimized production of aromatic dicarboxylic acids 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 dicarboxyl... | 11/10/2009 |
| 7586002 | Catalyst for purification of aromatic acids One aspect of the invention relates to a catalyst composite containing an extruded catalyst support containing an extruded activated carbonaceous material having specifically a defined pore structure. For example, the extruded activated carbonaceous material may hav... | 09/08/2009 |
| 7547803 | Process for producing a high purity aromatic polycarboxylic acid A process for producing a high purity aromatic polycarboxylic acid (APA) by purification of a crude APA comprises: (I) aging a slurry of the crude APA in a first dispersion medium at 180 to 300° C. for 10 minutes or longer under stirring; (II) introducing the aged ... | 06/16/2009 |
| 7482485 | Method for extracting slurry A major object of the invention is to provide such a method for extracting slurry that is not inhibited in extraction of slurry by a released and accumulated matter or a solid matter sedimented and accumulated at the bottom of the vessel. The invention relates to a ... | 01/27/2009 |
| 7462736 | Methods and apparatus for isolating carboxylic acid Disclosed are methods and apparatus for isolating a carboxylic acid. The processes employ a rotary pressure drum filter as a product isolation device in a carboxylic acid production process. The product isolation device is employed to isolate purified carboxylic aci... | 12/09/2008 |
| 7432395 | Enriched carboxylic acid composition 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... | 10/07/2008 |
| 7410632 | Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid 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 prod... | 08/12/2008 |
| 7381386 | Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid 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 vap... | 06/03/2008 |
| 7355071 | Method for preparing 2,6-naphthalene dicarboxylic acid Disclosed is an improved method for preparing 2,6-naphthalene dicarboxylic acid from di-lower alkyl 2,6-naphthalene dicarboxylate, which is characterized in that hydrolyzing di-lower alkyl 2,6-naphthalene dicarboxylate in a specified amount of water in the presence ... | 04/08/2008 |
| 7342128 | Method for oxidizing a slurry composition in a post oxidation zone in the presence of added steam 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 oxidati... | 03/11/2008 |
| 7339072 | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production 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 spe... | 03/04/2008 |
| 7314954 | System and method for recovering PTA mother liquid and purifying and regenerating of catalyst A system and a method for recovering PTA (purified terephthalic acid) mother liquid as well as purifying and regenerating catalyst, the system and the method is used mainly in manufacturing PTA wherein the mother liquid of the PTA generated by hydrogenation reaction... | 01/01/2008 |
| 7304178 | Enriched isophthalic acid composition 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... | 12/04/2007 |
| 7285677 | System and method for recovering CTA residues and purifying/regenerating catalyst A system/method for recovering CTA (crude terephthalic acid) residues and purifying and regenerating catalyst, being used for recovering residues generated in the reaction processes of oxidation in manufacturing PTA (purified terephthalic acid) as well as purifying ... | 10/23/2007 |
| 7282151 | Process for removal of impurities from mother liquor in the synthesis of carboxylic acid using pressure filtration 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 st... | 10/16/2007 |
| 7276625 | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production 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 spe... | 10/02/2007 |
| 7241855 | Method for the manufacture of polyesters A method is described for the manufacture of polyesters of aromatic dicarboxylic acids with aliphatic and/or cycloaliphatic dials, in which an aromatic dicarboxylic acid in the presence of a monocarboxylic acid or a mixture of a monocarboxylic acid present in a satu... | 07/10/2007 |
| 7226986 | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production 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 whic... | 06/05/2007 |
| 7196215 | Process for the production of purified terephthalic acid 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 hydro... | 03/27/2007 |
| 7193109 | Process for production of a carboxylic acid/diol mixture suitable for use in polyester production 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 whic... | 03/20/2007 |
| 7173150 | Process for recovering terephthalic acid from pulverized product of spent polyethylene terephthalate and system for use in such process This invention provides a process a process for recovering terephthalic acid from pulverized products of spent polyethylene terephthalate. This process comprises (1) a decomposition reaction step where the pulverized products of spent polyethylene terephthalate are ... | 02/06/2007 |
| 7160980 | Polyketones Method of purifying a polymeric material of a type which includes (A) phenyl moieties; (B) carbonyl and/or sulphone moieties; and; (C) ether and/or thioether moieties. The method includes contacting the polymeric material with a solvent formulation which is at a tem... | 01/09/2007 |
| 7161027 | Process for the oxidative purification of terephthalic acid 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... | 01/09/2007 |
| 7153998 | Method for refining 2,6-naphthalene dicarboxylic acid The present invention relates to a method for refining 2,6-naphthalene dicarboxylic acid, and particularly to a method for refining 2,6-naphthalene dicarboxylic acid comprising recrystallizing crude 2,6-naphthalene dicarboxylic acid in the form of an amine salt usin... | 12/26/2006 |
| 7135596 | Method of removing iron contaminants from liquid streams during the manufacture and/or purification of aromatic acids This invention relates to control or removal of amounts of dissolved iron that may be present in liquid process streams in the manufacture of aromatic acids. The present invention further relates to the control or removal of dissolved iron contaminants present in li... | 11/14/2006 |
| 7132566 | Process for the purification of a crude carboxylic acid slurry 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 oxidat... | 11/07/2006 |
| 7102029 | Method of crystallization The present invention proposes a crystallization process comprising the steps of feeding a slurry solution in which a terephthalic acid solution or a part of the terephthalic acid is precipitated to a crystallization vessel, precipitating the terephthalic acid in th... | 09/05/2006 |
| 7098299 | Separation of contaminants from polyester materials The present invention is generally directed to a process for separating and recovering post-consumer polyester from various contaminant materials. The invention can be utilized to separate post-consumer polyester from various contaminants including glass, dirt, pape... | 08/29/2006 |
| 7074954 | Process for the oxidative purification of terephthalic acid 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 ... | 07/11/2006 |
| 7057077 | Method for producing 2- (alkyl) cycloalkenone A method for producing 2-(alkyl)cycloalkenone and a method for producing alkyl(3-oxo-2-alkylcycloalkyl) acetate and 5-alkyl-5-alkanolide which are useful as flavoring materials and physiologically active substances using the same are provided. A method for producing... | 06/06/2006 |
| 7019170 | Process for the recovery of lactic acid by contacting aqueous solutions containing the same with a basic organic extractant The invention provides a process for the recovery of lactic acid and products thereof from an aqueous solution containing free lactic acid and at least one lactate salt at a total concentration of at least 5%, the process comprising the steps of: extracting at least... | 03/28/2006 |
| 7005540 | Method of purifying aromatic polycarboxylic acid Crude polycarboxylic acid is slurried in an aqueous medium and the slurry is brought into contact with a metal catalyst while preventing catalyst components thereof from contaminating crystals. Since hydrogenation or decarbonylation of a polymerization inhibitory su... | 02/28/2006 |
| 6972342 | Method for producing crystalline carboxylic acids Improved process for producing purified aromatic carboxylic acid in the form of dried crystals which comprises cooling the crystals in a fluidized state after the drying step to a temperature at or below 100° C. prior to packaging and an apparatus therefor. ... | 12/06/2005 |
| 6833472 | Process for the purification of aromatic carboxylic acids A novel process for the purification of crude aromatic carboxylic acids, such as, for example, terephthalic acid, orthophthalic acid, trimesic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid and pyromellitic acid, which are obtained by oxidising the corresp... | 12/21/2004 |
| 6818132 | Method and device for separating solids from a liquid phase The present invention relates to a process and an apparatus for separating separating polymeric from one or more by-products of preparation of the polymer and a first liquid phase, wherein the solid in a first liquid phase is brought into contact with a second liqui... | 11/16/2004 |
| 6765113 | Production of aromatic carboxylic acids A process for the production of an aromatic carboxylic acid comprising contacting in the presence of a catalyst, within a continuous flow reactor, one or more precursors of the aromatic carboxylic acid with an oxidant, such contact being effected with said precursor... | 07/20/2004 |
| 6756509 | Method for purifying crude 2,6-naphthalenedicarboxylic acid A method for purifying crude 2,6-naphthalenedicarboxylic acid includes a reduction step of reducing crude 2,6-naphthalenedicarboxylic acid containing 6-formyl-2-naphthoic acid with hydrogen and a cleaning step of cleaning the reduction product with alcohol. Preferab... | 06/29/2004 |
| 6753290 | Catalytic composition, method for manufacturing thereof and method for the purification of terephthalic acid The present invention relates to catalyst compositions for purifying terephthalic acid from p-carboxybenzaldehyde, based on Group VIII metals, comprising crystallites of catalytically active palladium or of palladium and at least one metal of Group VIII of the Perio... | 06/22/2004 |
