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7569720 |
Compounds
This invention relates to newly identified ester-linked gemini surfactant compounds, to the use of such compounds and to their production. The invention also relates to the use of the ester-linked...
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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...
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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...
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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.
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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...
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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...
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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 R 1 is H, lower...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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.
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4642369 |
Process for the production of dimethyl terephthalate from p-xylene and methanol
A process for the production of dimethyl terephthalate from p-xylene and methanol by oxidation in a reactor, in the liquid phase with atmospheric oxygen in the presence of dissolved heavy metal...
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4609634 |
High efficiency extraction method for recovering oxidation catalyst material from dimethyl terephthalate esterified oxidate residue and the like
Disclosed is a highly efficient continuous method for the aqueous extraction of water-soluble oxidation catalyst material from a residue such as that generated in the production of dimethyl...
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4578501 |
Preparation of terephthalic acid from a crude dimethyl terephthalate
A process for the production of a crude dimethyl terephthalate suitable for hydrolyzing into a fiber grade terephthalic acid involves separating a crude ester obtained from the production of...
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4518796 |
Method for preparing carboxylic esters
A method for preparing a carboxylic ester by reacting an aldehyde with an alcohol in the presence of oxygen with a catalyst, characterized in that the catalyst is a solid catalyst comprising...
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4464477 |
Process for the recovery and reuse of heavy metal oxidation catalyst from residues in the Witten DMT process
A process for the recovery and reuse of heavy metal oxidation catalyst from residues in the Witten DMT process by extraction, which involves mixing and settling of the residue with water or dilute...
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4410449 |
Recovery and reuse of heavy-metal oxidation catalyst from the Witten DMT process
A process for the recovery and reuse of a heavy-metal oxidation catalyst solution from a high-boiling distillation residue having a cobalt content of 1-10 g/kg of residue is disclosed. The...
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4398037 |
Process for producing aromatic carboxylic acids and methyl esters thereof
Disclosed is an improvement in the process for making an aromatic carboxylic acid or its methyl ester from an aromatic compound having at least one methyl or formyl group bonded directly to a...
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4374770 |
Process for preparation of aromatic acid chlorides
Disclosed is a process for converting aromatic aldehydes to the corresponding acid chlorides by reacting an aromatic aldehyde with sulfuryl chloride in the presence of a catalytic amount of a...
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4372875 |
Method for obtaining and reusing of oxidation catalyst in the Witten DMT process
A process for effecting the recovery and use of a heavy metal oxidation catalyst from a high-boiling distillation residue obtained during the Witten process for the production of dimethyl...
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4360691 |
Production of malonic anhydrides and derivatives thereof
Malonic anhydride and substituted malonic anhydrides are prepared by ozonolysis of the enol-lactone dimers of ketenes. The resulting malonic anhydrides can be hydrolyzed with water to form the...
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4353810 |
Minimizing iron in recovered oxidation catalyst material in DMT process
Disclosed is an improvement in a method for the recovery for recycle to the cooxidation-coesterification process for the production of dimethyl terephthalate from p-xylene, air and methanol of...
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4345089 |
Recovery of aromatic carboxylic acid or ester thereof from residue fraction of oxidation or esterification reaction mixture
Disclosed is a process for the recovery of aromatic carboxylic acid or ester thereof from the residue fraction of the oxidation or esterification reaction mixture resulting from the oxidation or...
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4342876 |
Method for oxidation of p-xylene and method for preparing dimethylterephthalate
A novel vertical induced circulation reactor is utilized to carry out the oxidation of p-xylene and p-methyltoluate with air in the presence of a catalyst to produce p-toluic acid and...
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4331608 |
Liquid phase catalytic co-oxidation process
Unsaturated compounds having at least 4 carbon atoms, including unsaturated alicyclic compounds having at least 4 carbon atoms, unsaturated aliphatic compounds having at least one carbon-carbon...
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4288588 |
Methyl-substituted polyphenylcarboxylic acids
Methyl-substituted polyphenylacyl compounds are prepared by selective oxidation of oligomers of mesitylene. These methyl-substituted polyphenylacyl compounds are useful as intermediates for...
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4249019 |
Process for producing carboxylic esters
A carboxylic ester is produced in one step in a high yield and with a high selectivity by reacting an aldehyde with an alcohol in the presence of oxygen by using a catalyst comprising (I)...
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4227010 |
Recovery of dimethyl terephthalate and intermediates from the tarry fraction of cooxidation process residue
Disclosed is a process for recovering dimethyl terephthalate and intermediate products from the tarry fraction of the residue generated in the production of dimethyl terephthalate from p-xylene and...
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