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| Number | Title | Issue Date |
| 7528277 | Method to produce a carboxylic acid ester from a carboxylic acid ammonium salt by alcoholysis The present invention relates to a method for obtaining a carboxylic acid ester from an aqueous solution of the corresponding carboxylic acid ammonium salt using alcoholysis. The recovered carboxylic acid ester may be subsequently hydrolyzed to produce the correspon... | 05/05/2009 |
| 7249469 | Method for separating a multicomponent stream This invention relates to a method for separating a stream having benzene, toluene and alkyl benzene, said method comprising: feeding the stream into a first distillation column, wherein the stream comprises between about 60 mole percent to about 85 mole percent tol... | 07/31/2007 |
| 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 |
| 7070712 | Acetylene polymers and their use as liquid crystals There is disclosed a liquid crystalline polyacetylene having a repeat structure of the formula where spa is a spacer group and mes is a mesogenic substituent. ... | 07/04/2006 |
| 7022857 | Preparation of substituted aromatic compounds A process for preparing compounds of the formula (II), where the substituents R1 to R5 are each independently H, CH3, straight-chain or branched C1–C8-alkyl, CH(O... | 04/04/2006 |
| 6967104 | Rapid method for estimation of Chemical Oxygen Demand The present invention relates to a rapid method for estimation of Chemical Oxygen Demand (COD) of water, COD is an important parameter for determining the extent of pollution in water bodies, the basic principle of COD estimation is not much different from prior art... | 11/22/2005 |
| 6831195 | Method for production of organic acid A method for producing an organic acid and/or an organic acid ester which utilizes a steam system permitting stable production of an organic acid and/or an organic acid ester and realizing a high thermal efficiency constantly relative to the waste heat generated in ... | 12/14/2004 |
| 6495710 | Synthesis and use of dimethyl 1,5-naphthalenedicarboxlyates and intermediates therefrom The synthesis of dimethyl-1,5-naphthalenedicarboxylate and polymers and articles formed therefrom is disclosed, as well as applications for dimethyl-1,5-naphthalenedicarboxylate, its corresponding acid 1,5-NDA, and various synthesis intermediates.... | 12/17/2002 |
| 6329547 | Vinylbenzene derivatives The present invention provides compounds represented by the following general formula [I] and salts thereof, which are useful as therapeutic agents for glaucoma, ##STR1## wherein R1 is H, lower alkyl or phenyl, and the phenyl can be substi... | 12/11/2001 |
| 6297348 | Closely linking a NDA process with a pen process Disclosed is a method for closely linking a process for producing 2,6-naphthalene dicarboxylic acid (2,6-NDA) with a process for producing polyethylene naphthalate, thus eliminating the need for drying 2,6-NDA, handling solid 2,6-NDA, and optimizing parti... | 10/02/2001 |
| 6197216 | Ferrielectric liquid crystal compound A novel ferrielectric liquid crystal compound of the formula (1), ##STR1## wherein R is a linear alkyl group having 6 to 12 carbon atoms, X is a hydrogen atom or a fluorine atom, m is an integer of 1 to 3, n is an integer of 1 to 3, and C* is an asymmetri... | 03/06/2001 |
| 6160159 | Preparation of dimethyl terephthalate via the air oxidation of p-tolualdehyde The invention is directed to a process for the production of terephthalic acid and esters thereof from p-tolualdehyde or mixtures of p-tolualdehyde and p-xylene. The process of the invention can be carried out at lower temperatures and faster throughput t... | 12/12/2000 |
| 6133470 | Integration of p-xylene production and subsequent conversion process A process for producing terephthalic acid and/or dimethyl terephthalate includes contacting a toluene-containing reaction stream with a first catalyst under toluene disproportionation conditions to produce an intermediate product stream of para-xylene wit... | 10/17/2000 |
| 6028211 | Composition and method for reducing fouling in process equipment used for manufacturing aromatic materials Methods for reducing the fouling of process equipment used in the manufacture of aromatic compounds such as dimethyl-2,6-naphthalenedicarboxylate are disclosed. The methods require treating manufacturing process streams with a metal complexing agent. ... | 02/22/2000 |
| 5877341 | Methods and devices for controlling the reaction rate of a hydrocarbon to an intermediate oxidation product by pressure drop adjustments Methods and devices for controlling the reaction rate of a hydrocarbon to an acid or other intermediate oxidation product by pressure drop rate adjustments. The pressure drop rate measurements arc conducted at predetermined time intervals, after stopping ... | 03/02/1999 |
| 5869736 | Oxidation in the Witten-Hercules process for preparing dimethyl terephthalate A process is provided for the oxidation of p-xylene and methyl p-tolulate with oxygen-containing gases in the Witten-Hercules process for preparing dimetyl terephthalate in at least two sequentially arranged stages and in the presence of a catalyst, where... | 02/09/1999 |
| 5852201 | Process for the distillation of crude ester in the DMT/PTA process A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crud... | 12/22/1998 |
| 5614159 | Process for the purification of an oxidation off gas with energy recovery In the purification of an off-gas stream originating from a process of oxidizing a liquid mixture of para-xylene with methyl para-toluate with an oxygen-containing gas under pressure, the off-gas being contaminated with at least one of an aliphatic and an... | 03/25/1997 |
| 5587508 | Process for producing 2,6-naphthalenedicarboxylic acid and ester thereof A process for producing 2,6-naphthalenedicarboxylic acid (NDCA) is disclosed. This process comprises oxidizing a 2,6-dialkylnaphthalene with a gas containing molecular oxygen in a solvent containing a lower aliphatic carboxylic acid in the presence of a c... | 12/24/1996 |
| 5350874 | Process for preparing diesters of naphthalenedicarboxylic acids A continuous process for preparing a dialkylester of a naphthalenedicarboxylic acid comprising passing a liquid phase reaction mixture comprising a low molecular weight alcohol, a naphthalenedicarboxylic acid and a dialkylester of a naphthalenedicarb... | 09/27/1994 |
| 5338882 | Process for the production of DMT-intermediate product of specific purity and pure terephthalic acid The invention relates to a process for the production of a DMT intermediate product as well as its working up to fibregrade DMT and to medium pure and pure terephthalic acid. The DMT intermediate product is moreover produced by combined oxidation of a pre... | 08/16/1994 |
| 5334754 | Process for preparing 2,5-diphenylterephthalic acid by oxidation Provided is a process for preparing 2,5-diphenylterephthalic acid, which is useful in preparing certain polyesters, especially liquid-crystalline polyesters. In this process, p-xylene is di-alkylated with cyclohexene to provide 2,5-dicyclo-hexyl-p-xylene,... | 08/02/1994 |
| 5286896 | Process for the production of DMT-intermediate product of specific purity The invention relates to a process for the production of a DMT intermediate product as well as its working up to fibregrade DMT and to medium pure and pure terephthalic acid. The DMT intermediate product is moreover produced by combined oxidation of a pre... | 02/15/1994 |
| 5254719 | Process for preparing purified dimethyl naphthalenedicarboxylate A process for preparing purified dimethyl-2,6-naphthalenedicarboxylate by the esterification of 2,6-naphthalenedicarboxylic acid is disclosed, and which process provides for the efficient removal of residual oxidation catalyst metals from the dimethyl-2,6... | 10/19/1993 |
| 5202469 | Partially fluorinated dicarboxylic acid and the acid chloride thereof, and a process for their preparation Partially fluorinated dicarboxylic acid and the acid chloride thereof, a process for its preparation and its use. The compound of the formula (I) ##STR1## and the acid chloride thereof are prepared by air oxidation in the presence of a catalyst mixtu... | 04/13/1993 |
| 5138025 | Stabilized naphthalenedicarboxylic acid diesters A method for stabilizing molten diesters of naphthalenedicarboxylic acids and stabilized naphthalenedicarboxylic acid diester compositions are disclosed.... | 08/11/1992 |
| 5101050 | Process for the production of aromatic anhydrides and aromatic esters with superior color properties A process for the production of aromatic esters or aromatic anhydrides with improved color properties is disclosed. This process comprises treating the aromatic ester or aromatic anhydride with an activated boric acid followed by fractionation.... | 03/31/1992 |
| 5095135 | Process for the preparation of high-purity naphthalenecarboxylic acid esters A process for the preparation of naphthalenecarboxylic acid esters in which a substituted naphthalene is oxidized with molecular oxygen in the presence of a heavy metal-based catalyst in a solvent comprising a lower aliphatic monocarboxylic acid to form a... | 03/10/1992 |
| 4952721 | Process for oxidizing esters of methyl-substituted phenol compounds to aromatic carboxylic acids A process is disclosed for the oxidation of esters of para- and meta-methyl-substituted phenols to the corresponding aromatic carboxylic acid in the presence of a promoter comprising an anhydride of a lower aliphatic carboxylic acid and a heavy metal cata... | 08/28/1990 |
| 4950786 | Method for making 2,6-naphthalene dicarboxylic acid A method for making 2,6-naphthalene dicarboxylic acid by the oxidation of 2,6-diisopropylnaphthalene or its oxidation derivatives in the presence of a catalyst comprising cobalt, manganese, cerium and bromine components is disclosed.... | 08/21/1990 |
| 4943626 | Primary polyether active hydrogen compounds which are prepared from linked, protectively initiated polyalkyleneoxides Polyether active hydrogen compounds having at least two terminal active hydrogen groups on primary carbon atoms are prepared by (a) forming polyoxyalkylene molecules each having at least one active hydrogen precursor, (b) linking at least two of the polyo... | 07/24/1990 |
| 4908471 | Method for the production of benzene carboxylic acids and benzene dicarboxylic acid esters Disclosed is a method for the production of benzene carboxylic acids and benzene carboxylic acid esters or their mixtures, while p-toloylic acid is made from p-xylene and terephthalic acid monomethyl ester is simultaneously prepared from p-toluylic acid e... | 03/13/1990 |
| 4906772 | Process for production of polycarboxylic aromatic acids A process is disclosed for the co-production of aliphatic monocarboxylic acids and polycarboxylic aromatic acids in high selectivity, conversion and yield. The aliphatic monocarboxylic acid can serve as a component of the solvent for the process.... | 03/06/1990 |
| 4886901 | Method for purifying a crude dimethyl naphthalene dicarboxylate A method for purifying a dimethyl naphthalene dicarboxylate produced from a naphthalene dicarboxylic acid which is in turn produced by the liquid phase oxidation of a dialkylnaphthalene or partially oxidized derivative thereof in the presence of a catalys... | 12/12/1989 |
| 4853479 | Process for the manufacture of aromatic dicarboxylic acids and derivatives thereof An improved process for the manufacture of aromatic dicarboxylic acids and derivatives thereof is described. The process is based on the reaction of a corresponding aromatic hydrocarbon in a liquid phase oxidation with an oxygen-containing gas in the pres... | 08/01/1989 |
| 4847407 | Diphenyl ester derivative of stilbenedicarboxylic acid Disclosed are phenyl esters of stilbenedicarboxylic acid. The carboxylate portions of the compounds are bonded at the meta or para positions of the stilbene moiety.... | 07/11/1989 |
| 4820862 | Process for the preparation of dimethyl terephthalate The yield of dimethyl terephthalate obtained by the oxidation of a mixture of p-xylene and methyl p-toluate, preferably with air, and esterification of the thus-produced acids is increased by utilizing a mixture of cobalt and manganese compounds as the ox... | 04/11/1989 |
| 4789755 | Process for the preparation of stilbenedicarboxylate derivatives Disclosed is a process for producing dimethyl or novel diphenyl derivatives of stilbenedicarboxylic acids from dimethyl toluates or diphenyl toluates and sulfur. The reaction requires an excess of toluate to sulfur of at least about 5:1. In addition hydro... | 12/06/1988 |
| 4772742 | Polyacyl aryl arylates Aryl arylate esters substituted with an acyl moiety on both the aryl and arylate groups of said esters which can be produced by the oxidation of alkyl substituted aryl arylate esters using a heavy metal/bromine catalyst.... | 09/20/1988 |
| 4734309 | Form of solid dimethylterephthalate A block of dimethylterephthalate having a needle-like crystal structure. The block is easily cleavable, and has a reduced tendency to fuse to other blocks when subjected to bag-stacking pressure.... | 03/29/1988 |
