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7183233 Method for separating an esterification catalyst  
Process for removal of the esterification catalyst by separation from a crude plasticizer ester obtained by reacting a dicarboxylic acid with C 8 –C 13 alcohols, by treating the crude ester with...
7067690 Separation of diastereoisomers  
Process for modifying the relative ratios of the components of a liquid starting mixture of specific diastereoisomers, containing at least two asymmetric carbon atoms comprising contacting said...
6825379 Method for recovering and producing C4-C6 dicarboxylate from alkaline waste solution generated in caprolactam preparation process  
The present invention relates to a method for recovering and producing C 4 -C 6 dicarboxylates from an alkaline waste solution generated in a caprolactam preparation process, in which the alkaline...
6627768 Process for recovery of acid  
The invention provides a process for the conversion of an extracted carboxylic acid to a non-ionized derivative thereof, comprising contacting a carboxylic acid containing aqueous solution with a...
6580004 Process for preparing potassium monoethyl malonate  
A process for preparing potassium monoethyl malonate by selective saponification of malonic acid diethyl ester with potassium hydroxide, in which the potassium hydroxide is added to the malonic...
6369263 Process for producing hydroquinone diester derivative  
A hydroquinone diester derivative represented by the formula (1): wherein R 1 and R 2 are the same or different, each representing an alkyl group, a cycloalkyl group, an aryl group, or a...
6333429 Process for preparing alkali metal salts of malonic monoalkyl esters  
The invention relates to a process for preparing alkali metal salts of malonic monoalkyl esters by selective saponification of malonic dialkyl esters using a basic alkali metal compound which...
6313358 Method for producing hexanediol  
Hexanediol is prepared by hydrogenating dialkyl adipates or mixtures which contain a dialkyl adipate as the essential component and organic halogen compounds as impurities, by a process in which,...
6310003 Composition of chemicals for manipulating the behavior of the orange wheat blossom midge, sitodiplosis mosellana (Gehin)  
The invention relates to a composition and procedure for manipulating the behavior of the orange wheat blossom midge, Sitodiplosis mosellana. More importantly, this invention relates to the...
5952458 Process for preparing a vinyl terminated polymer  
Synthesis of a vinyl terminated polymer by reacting a cationically polymerizable monomer in the form of a cyclic ether with an acid chloride in a suitable solvent and in the presence of a Lewis...
5869729 Method of producing an ester compound  
An ester compound, for example, carbonic acid ester or succinic acid ester, is produced by catalytically reacting, in gas phase, carbon monoxide with a nitrous acid ester and optionally an olefin...
5840959 Method of oxidizing alkyl-5-formyl valerate to monoalkyl adipate  
An improved method for the selective oxidation of alkyl-5-valerate to monomethyl adipate (e.g., methyl-5-valerate to monomethyl adipate). By performing the air oxidation at high pressure...
5684179 Method for recovering diacetate esters of polytetramethylene ethers  
An improved method for recovering purified diesters of polytetramethylene ethers involving the polymerization of tetrahydrofuran (THF) optionally with one or more comonomers (e.g., 3-methyl THF,...
5616783 Purification process of polyhydroxycarboxylic acid  
A purification process for polyhydroxycarboxylic acids which comprises dissolving polyhydroxycarboxylic acid in an water-immiscible phenol or an organic solvent containing said water-immiscible...
5420336 Catalyst recovery and dialkyl ester synthesis  
Copper and vanadium catalyst components are recovered and dialkyl esters of dicarboxylic acids are synthesized by precipitating the catalyst metals with an alcohol selected from the group...
5248833 Process for purifying polyols made with double metal cyanide catalysts  
A process for purifying polyether polyols prepared using double metal cyanide (DMC) catalysts is disclosed. The process involves combining a mixture of the polyol and a C 1 -C 6 aliphatic alcohol...
5087730 Method for producing a purified ester  
A method for producing an ester, which comprises reacting an organic acid or its anhydride with an alcohol in the presence of a catalyst of an organometallic compound, wherein an esterification...
4946029 Purification of carboxylic esters which contain aldehydes, acetals and/or unsaturated compounds  
Carboxylic esters obtained by reacting olefinically unsaturated compounds with carbon monoxide and alcohols and containing aldehydes, acetals and/or unsaturated compounds are purified by (a)...
4927959 Alprenolol derivatives  
Novel alprenolol derivatives represented by the formula: ##STR1## wherein R is ##STR2## and hydrochlorides thereof are disclosed.
4861912 Process for the preparation of a diester of adipic acid  
Process for preparing adipic acid or esters thereof by: (1) reacting 1,3-butadiene with CO and water or an alcohol with formation of pentenoic acid or esters thereof in the presence of a first...
4818274 Method and composition for regulating the flowering of plants  
A method of delaying flowering in plants which control their flowering by producing a flowering inhibiting regulator on a seasonal basis is provided. In the method of the invention, a flowering...
4795824 Process for the production of dialkyl maleates  
A process is described for the production of a dialkyl maleate by reaction of maleic anhydride with an alkyl alcohol in a monoesterification zone to form the corresponding monoalkyl maleate,...
4765869 Process for the production of a dialkyl maleate  
A continuous process is described for the production of a substantially acid free dialkyl maleate, for example diethyl maleate, from a feed stream containing a major amount of dialkyl maleate and a...
4740272 Separation of monoalkyl maleate from dialkyl maleate  
A method of producing substantially pure dialkyl maleate by separating monoalkyl maleate from dialkyl maleate in a short residence time distillation zone while minimizing reversion of the monoalkyl...
4736059 Process for the preparation of meso 2,5-dihaloadipates  
The present process produces the meso dialkyl 2,5-dihaloadipate from a mixture of the racemic dialkyl 2,5-dihaloadipate and meso 2,5-dihaloadipate. In the disclosed process, a 2,5-dihaloadipoyl...
4542234 Process for the separation of (S,S) diastereoisomers  
The (S,S) optical isomer of a compound having the general formula ##STR1## wherein R and R 1 -5 are as defined herein, is recovered essentially free of the (R,S) and (S,R) isomers, by forming a...
4523027 Purification of carboxylates containing aldehydes, acetals and/or unsaturated compounds  
Carboxylates which contain aldehydes, acetals and/or unsaturated compounds and are obtained by reacting an olefinically unsaturated compound with carbon monoxide and an alkanol are purified by a...
4507475 Process for purification of crude polyether polyols  
A process for purifying crude polyether polyols which are prepared by anionic polymerization of alkylene oxides in the presence of basic catalysts. The polyols are mixed with water and...
4506091 Removal of catalyst residues from polyesters  
A process for preparing esters which comprises reacting a polycarboxylic acid with an excess of alcohol and in the presence of an organotitanate catalyst, treating the crude mixture with a suitable...
4500463 Polyprenyl carboxylic acid derivatives  
Polyprenyl carboxylic acid derivatives having the general formula (I): ##STR1## in which n is an integer of from 2 to 4, R 1 represents the hydrogen atom or a protecting group for the carboxylic...
4444692 Process for making hydroxyl terminated liquid polymers  
Hydroxyl terminated reactive liquid polymers are prepared by reacting ethylene oxide, in presence of an amine catalyst, with a carboxyl terminated reactive liquid polymer serum which contains, in...
4442303 Recovery of water miscible organic acids from aqueous solution as alkyl esters  
In one of its embodiments this invention provides a process for recovering C 4 -C 6 dicarboxylic acid components contained in a waste byproduct stream derived from a reaction system in which...
4442039 Process for treating hydroxyl terminated liquid polymers  
Hydroxyl terminated liquid polymers that are excessively active in reaction with organic diisocyanates may be deactivated by treating the hydroxyl terminated liquid polymer with phosphoric acid or...
4390398 Modified process for resin manufacturing using a continuous separate distillation column  
Volatile reactants are heated under reflux in a reactor and form volatile reaction by-products which are continuously removed in a vapor effluent from a reflux column and partial condenser. The...
4385005 Process for separating unsaturated hydrocarbons using copper or silver complexes with fluorinated diketonates  
A process of removing unsaturated hydrocarbons containing at least one non-aromatic unsaturation from feedstreams which comprises contacting the feedstream with at least one of Cu 2 O or Ag 2 O...
4375552 Nitric acid process for production of adipic acid from hydrocarbons  
Waste streams from adipic acid manufacture containing nitric, succinic, glutaric and adipic acids and valuable catalytic metal as salts are treated with alcohols, thereby separating, as esters,...
4365079 Recovery of dimethyl sebacate from an isomeric mixture of C.sub.12 esters  
Dimethyl sebacate is recovered from a reaction mixture containing it in predominant amount and minor amounts of other dimethyl esters of C 10 -dicarboxylic acids by stepwise recrystallization...
4339596 Treatment of byproduct stream from adipic acid manufacture  
In one embodiment, this invention provides a process for converting a dilute aqueous filtrate byproduct stream from adipic acid manufacture into a concentrated methanolic solution which does not...
4331812 Treatment of dibasic esters with alkali metal methylates  
Process for reducing the color forming tendency of alkanedioic acid methyl esters by contact with an alkali metal methylate.
4304925 Process for purifying esters  
In a process for purifying an ester with little contamination by catalytic metal components in a high yield which comprises treating an esterification reaction mixture with a basic substance, said...
4255591 Carbonylation process  
There is provided an improved continuous homogeneous catalytic carbonylation process wherein a mixed gas stream is removed from the carbonylation reactor, condensable liquids separated from said...
4241216 Phthalic acid diester preparation with waste stream purification and recycle  
A continuous process for the preparation in at least one esterification reactor of phthalate diesters utilizing phthalic acid or anhydride and a stoichiometric excess of at least one saturated...
4237317 Process for producing sebacic acid  
Sebacic acid is produced from adipic acid by half esterifying adipic acid with methanol to produce monomethyl adipate, carrying out electrolytic condensation of the monomethyl adipate in a methanol...
4216337 Process for preparing esters  
A process for preparing esters which comprises reacting a polycarboxylic acid with an alcohol, removing the unreacted alcohol from the resultant esterification reaction mixture, heating the crude...
4215065 Acid separation  
Differential esterification or hydrolysis is utilized to effect separations of isomeric acids or esters.
4187153 Production of alkylene glycols  
According to the present invention an impure liquid containing ethylene glycol or propylene glycol, lower carboxylate esters of the glycol, water, carboxylic acid and glycol-azeotroping agent is...
4105856 Recovery process for aqueous waste streams in adipic acid systems  
By-product or waste streams from adipic acid plants which contain adipic acid, glutaric acid, succinic acid, nitric acid and catalyst values of copper and vanadium are treated to substantially...
4086338 N-carboxyalkanoyl derivatives of azetidine-2-carboxylic acid  
New carboxyalkylacylamino acids which are derivatives of proline, pipecolic acid and azetidine-2-carboxylic acid and have the general formula ##STR1## are useful as angiotensin converting enzyme...
4082788 Esterification and extraction process  
Organic acids contained in aqueous solution are separated and/or recovered by a process comprising adding an alcohol to the aqueous solution to esterify the acids present, while preferably...
4076948 Process for treatment of adipic acid mother liquor  
Treatment of aqueous nitric acid solutions resulting from the nitric acid oxidation of cyclohexanol and/or cyclohexanone in the presence of metal compound oxidation catalysts for recovery of the...
Matches 1 - 50 out of 117 1 2 3 >