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| Number | Title | Issue Date |
| 7709681 | Process for the production of trimellitic acid Trimellitic acid is produced by oxidation of pseudocumene in acetic acid at temperatures between 130 and 240° C. in the presence of a catalyst composition containing cobalt, manganese and bromine. The process comprises the stages of: (i) simultaneously... | 05/04/2010 |
| 7589231 | 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... | 09/15/2009 |
| 7586000 | 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... | 09/08/2009 |
| 7582793 | 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... | 09/01/2009 |
| 7563926 | 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... | 07/21/2009 |
| 7550627 | Processes for producing aromatic dicarboxylic acids Processes for producing aromatic dicarboxylic acids are disclosed, the processes including a step of combining in a reaction medium a dialkyl aromatic, a solvent comprising water and a saturated organic acid having from 2-4 carbon atoms, and an oxygen-containing gas... | 06/23/2009 |
| 7485746 | Staged countercurrent oxidation A process for oxidation with oxygen of at least one aromatic hydrocarbon having oxidizable, substituents that maximizes the utilization of oxygen without reduction in the quality of the carboxylic acid products produced by means of a stagewise countercurrent oxidati... | 02/03/2009 |
| 7482482 | 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... | 01/27/2009 |
| 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 |
| 7393973 | Polycarboxylic acid production system with enhanced residence time distribution for oxidative digestion 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 me... | 07/01/2008 |
| 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 |
| 7378544 | Anthracene and other polycyclic aromatics as activators in the oxidation of aromatic hydrocarbons The present invention relates to the liquid phase oxidation of aromatic hydrocarbons in the presence of at least one heavy metal oxidation catalyst and bromine, which is activated by at least one of anthracene or another polycyclic aromatic compound to produce aroma... | 05/27/2008 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7098360 | Processes employing multiple successive chemical reaction process steps and apparatus therefore The invention provides processes and apparatus for the production of materials requiring a plurality of chemical reaction steps. In the prior art the number of reaction vessels is minimized by performing two or more reactions together in the same vessel. Instead eac... | 08/29/2006 |
| 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 |
| 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 |
| 6958373 | Transformation of polymers to useful chemicals oxidation Polymeric materials are recycled by transformation to useful chemicals by oxidization in the liquid phase using acetic acid as a solvent and a metal bromide catalyst. ... | 10/25/2005 |
| 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 |
| 6835852 | Process for producing trimellitic acid A process for producing trimellitic acid which comprises step A for oxidizing pseudocumene, thereby obtaining a reaction mixture comprising dimethyl benzoic acid, dimethyl benzyl alcohol, and dimethyl benzaldehyde, step B for separating dimethyl benzoic acid, dimeth... | 12/28/2004 |
| 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 |
| 6562997 | Production of high purity aromatic carboxylic acid by oxidation in benzoic acid and water solvent Processes for the production of aromatic carboxylic acids is disclosed. The aromatic acids are produced by the liquid phase oxidation of a suitable acid precursor in a reaction medium comprising benzoic acid. According to one embodiment, the oxidation is ... | 05/13/2003 |
| 6562996 | Alkyl aromatic aldehydes A composition containing isomeric mixtures of arylaldehydes prepared from a mixed alkyl aromatic feedstock. A composition containing isomeric mixtures of dimethylbenzaldehydes prepared from a mixed xylene feedstock using a Gatterman-Koch type reaction. A ... | 05/13/2003 |
| 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 |
| 6504051 | Process for production of aromatic carboxylic acids with improved water removal technique 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... | 01/07/2003 |
| 6500347 | Process for recovering crystals from a slurry A process for recovering crystals from a slurry which comprises supplying a slurry comprising crystals and a solvent to a rotary vacuum filter and successively conducting filtration under suction, washing, filtration under suction and cleavage of a cake c... | 12/31/2002 |
| 6476257 | Method for preparing aromatic carboxylic acids from alkylaromatics by liquid-phase oxidation The present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by liquid-phase oxidation. More particularly, the present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by oxid... | 11/05/2002 |
| 6194607 | Method of producing aromatic carboxylic acids by oxidizing alkyl aromatic hydrocarbons or partially oxidized intermediates thereof An improved production method of aromatic carboxylic acid products of significantly improved yield and quality by oxidizing alkyl aromatic substrates or their partially oxidized intermediates in a conventional MC-type catalyst system modified to contain a... | 02/27/2001 |
| 6180822 | Method of producing aromatic carboxylic acids by oxidizing alkyl aromatic compounds or partially oxidized intermediates thereof with carbon dioxide containing gas An improved production method of aromatic carboxylic acid products of significantly improved yield and quality, the method including oxidizing alkyl aromatic substrates or their partially oxidized intermediates in a catalyst system containing a convention... | 01/30/2001 |
| 6175038 | Method of producing aromatic carboxylic acids by oxidizing alkyl aromatic compounds or partially oxidized intermediates thereof with oxygen-enriched gas An improved production method of aromatic carboxylic acids of significantly improved yields and quality by oxidizing alkyl aromatic substrates or their partially oxidized intermediates by oxygen-enriched gas in a conventional Co--Mn--Br catalyst system co... | 01/16/2001 |
| 6160170 | Process for the production of aromatic acids Process for producing mono- and poly-carboxylic aromatic acids by oxidation of the corresponding precursors with molecular oxygen and/or air in the presence of a catalytic complex formed by a combination of at least one metal selected from ruthenium, irid... | 12/12/2000 |
| 6137001 | Process for preparing aromatic carboxylic acids with efficient treatments of gaseous effluent Processes are disclosed for recovery of hydrogen bromide from one or more alkyl bromide compounds by hydrolyzing the alkyl bromide compounds to hydrogen bromide and corresponding alcohols, and simultaneously separating at least the alcoholic products of h... | 10/24/2000 |
