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| Number | Title | Issue Date |
| 8084639 | Method of reducing inflow of water from a reactor outlet gas to a dehydration tower for separating carboxylic acid solvent and water A method of reducing or eliminating inflow of water to a dehydration tower using steam for separating water from a carboxylic acid from a reactor outlet gas produced in a reactor during oxidation of an aromatic compound in a carboxylic acid solvent to produce an aro... | 12/27/2011 |
| 7956215 | Versatile oxidation byproduct purge process Disclosed is a process and apparatus for treating a purge stream in a carboxylic acid production process. The process employs a purge process that allows for the separation of oxidation byproducts into benzoic acid and non-benzoic acid oxidation byproducts, thus pro... | 06/07/2011 |
| 7880032 | Versatile oxidation byproduct purge process Disclosed is a process and apparatus for treating a purge stream in a carboxylic acid production process. The process employs a purge process that allows for the separation of oxidation byproducts into benzoic acid and non-benzoic acid oxidation byproducts, thus pro... | 02/01/2011 |
| 7863481 | Versatile oxidation byproduct purge process Disclosed is a process and apparatus for treating a purge stream in a carboxylic acid production process. The process employs a purge process that allows for the separation of oxidation byproducts into benzoic acid and non-benzoic acid oxidation byproducts, thus pro... | 01/04/2011 |
| 7569722 | Process for removal of benzoic acid from an oxidizer purge stream 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. ... | 08/04/2009 |
| 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 |
| 7402694 | Process for removal of benzoic acid from an oxidizer purge stream 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. ... | 07/22/2008 |
| 7399882 | Optimized liquid-phase oxidation 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 reacti... | 07/15/2008 |
| 7390921 | Optimized liquid-phase oxidation 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 reacti... | 06/24/2008 |
| 7381836 | Optimized liquid-phase oxidation 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 reacti... | 06/03/2008 |
| 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 |
| 7371894 | Optimized liquid-phase oxidation 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 reacti... | 05/13/2008 |
| 7371866 | Preparation of aromatic and heteroaromatic carboxylic acids by catalytic ozonolysis A process for catalytically oxidizing alkylaromatic compounds of the formula (I) Ar—CH2—R where Ar is an optionally substituted, aromatic or heteroaromatic 5-membered or 6-membered ring or a ring system having up to 20 carbon atoms... | 05/13/2008 |
| 7361784 | Optimized liquid-phase oxidation 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 reacti... | 04/22/2008 |
| 7358389 | Oxidation system employing internal structure for enhanced hydrodynamics 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 reacti... | 04/15/2008 |
| 7355068 | Oxidation system with internal secondary reactor 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 reacti... | 04/08/2008 |
| 7350372 | System and method for selective heating and cooling A combined heating/cooling system and method is provided wherein an absorption tank (20) houses a refrigerant and absorbant mixture composition. A boiler (50) heats the high pressure mixture composition and vaporizes the refrigerant. Heated absorbant i... | 04/01/2008 |
| 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 |
| 7291270 | Process for removal of impurities from an oxidizer purge stream A process is disclosed that relates to the removal of impurities and the recovery of a mother liquor and wash filtrate from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves the rem... | 11/06/2007 |
| 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 |
| 7273559 | Process for removal of impurities from an oxidizer purge stream A process is disclosed that relates to the removal of impurities and the recovery of a mother liquor and wash filtrate from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic. More particularly, the process involves the rem... | 09/25/2007 |
| 7238833 | 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... | 07/03/2007 |
| 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 |
| 7153480 | Apparatus for and method of producing aromatic carboxylic acids A reactor for the oxidation of a precursor to an aromatic carboxylic acid or ester thereof in a liquid phase reaction mixture is disclosed. The reactor comprises an elongate vessel, substantially vertical in use, having an upper mixing element and a lower mixing ele... | 12/26/2006 |
| 7143294 | Apparatus and method for secure field upgradability with unpredictable ciphertext An apparatus and method for enabling functionality of a component, wherein the apparatus includes a random number generating module for generating a random number, and a hash function module in communication with the random number generating module. A host is provid... | 11/28/2006 |
| 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 |
| 7060853 | Method for increasing oxidation reactor production capacity The present invention relates to a method for increasing the production capacity of a conventional oxidation reactor for catalytic liquid phase oxidation of paraxylene by staging the oxidation reaction into a first high pressure and high solvent ratio reaction zone ... | 06/13/2006 |
| 7049465 | Process for energy recovery in processes for the preparation of aromatic carboxylic acids 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 phas... | 05/23/2006 |
| 7022307 | Method for gas—solid contacting in a bubbling fluidized bed reactor The present invention relates to a method for gas-solid contacting in a bubbling fluidized bed reactor by: (a) introducing into a reactor with bed length to bed diameter ratio below about 5.0, a primary gas consisting essentially of reactant(s) of the r... | 04/04/2006 |
| 7005011 | Method of removing iron oxide deposits from the surface of titanium components Disclosed is a method and solvent composition capable of removing iron oxide deposits from the surface of titanium components without substantially damaging the underlying titanium component. Iron oxide deposits may be removed from the surface of a titanium componen... | 02/28/2006 |
| 6949673 | Process for producing carboxylic acids Improved process for producing aromatic carboxylic acids by catalytic liquid phase oxidation of a corresponding precursor in a suitable solvent comprising feeding the reactants to a first oxidation reaction zone at high pressure and high solvent ratio, wherein uptak... | 09/27/2005 |
| 6852879 | Method of removing iron oxide deposits from the surface of titanium components Disclosed is a method and solvent composition capable of removing iron oxide deposits from the surface of titanium components without substantially damaging the underlying titanium component. Iron oxide deposits may be removed from the surface of a titanium componen... | 02/08/2005 |
| 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 |
| 6761860 | Apparatus for the production of aromatic acids A description is given here of a novel process for the production of monocarboxylic and polycarboxylic aromatic acids by the catalytic oxidation in homogeneous phase of aromatic compounds carrying at least one oxidizable substituent group attached directly to the ca... | 07/13/2004 |
| 6689903 | Crystallization method for production of purified aromatic dicarboxylic acids 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 ... | 02/10/2004 |
| 6642407 | Production, purification and polymerization of aromatic dicarboxylic acids This invention provides a process for purifying the crude aromatic dicarboxylic acids produced by oxidation of dialkyl aromatic hydrocarbons and for using the purified acids in the preparation of polyethylene terephthalate, polyethylene naphthalate and ot... | 11/04/2003 |
| 6620966 | Process for producing aromatic carboxylic acid There is disclosed a process for continuously producing an aromatic carboxylic acid comprising the steps of (A) subjecting a poly-alkyl aromatic hydrocarbon to a liquid-phase oxidation by continuously supplying an oxidation reactor with said hydrocarbon, ... | 09/16/2003 |
| 6521786 | Process for the production of aromatic acids A description is given here of a novel process for the production of monocarboxylic and polycarboxylic aromatic acids by the catalytic oxidation in homogeneous phase of aromatic compounds carrying at least one oxidizable substituent group attached directl... | 02/18/2003 |
| 6506931 | Process for producing aromatic carboxylic acid A process for producing an aromatic carboxylic acid by a liquid phase oxidation of an alkylaromatic compound with molecular oxygen in a reaction solvent comprising a lower aliphatic carboxylic acid in the presence of an oxidation catalyst, in which an aro... | 01/14/2003 |
