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| Number | Title | Issue Date |
| 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 C8–C13 alcohols, by treating the crude ester with an aqueous alkali solution in the range from 10 to... | 02/27/2007 |
| 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 liquid mixture with a Lewis acid compound capable of co-ordinating a com... | 06/27/2006 |
| 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 C4-C6 dicarboxylates from an alkaline waste solution generated in a caprolactam preparation process, in which the alkaline waste solution is treated with sulfuric acid to se... | 11/30/2004 |
| 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 water-insoluble amine solvent, to recover acid therefrom an... | 09/30/2003 |
| 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 acid diethyl ester, malonic acid diethyl ester and potassium ... | 06/17/2003 |
| 6369263 | Process for producing hydroquinone diester derivative A hydroquinone diester derivative represented by the formula (1): ##STR1## wherein R1 and R2 are the same or different, each representing an alkyl group, a cycloalkyl group, an aryl group, or a heterocyclic group is crystallized from a re... | 04/09/2002 |
| 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 comprises preparing from the malonic dialkyl ester and an alkal... | 12/25/2001 |
| 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, before the hydrogenation, the dialkyl adipates or the mixtu... | 11/06/2001 |
| 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 preparation and use of 2,7-nonanediyl dibutyrate or stereoisomers... | 10/30/2001 |
| 6306263 | Impurities separation by distillation A distillation procedure is provided for the separation of impurities from organic materials such as glycols and glycol ethers whereby a liquid stripping component is interfaced into a distillation column with or below the organic material introduction, h... | 10/23/2001 |
| 6172257 | 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 acid diethyl ester, malonic acid diethyl ester and potassium ... | 01/09/2001 |
| 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 acid. The vinyl-terminated polymers can be polymerized with o... | 09/14/1999 |
| 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 in the presence of a catalyst and in the presence of a chlo... | 02/09/1999 |
| 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 (i.e.,>10 bars air and preferably 35 to 65 bars) and relatively mode... | 11/24/1998 |
| 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, ethylene oxide, propylene oxide, or the like) utilizing a so... | 11/04/1997 |
| 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 phenol, successively bringing the resulting solution into con... | 04/01/1997 |
| 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 consisting of methanol, ethanol, and isopropanol removal of the pre... | 05/30/1995 |
| 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 C1 -C6 aliphatic alcohol with an amount of a chelating agent eff... | 09/28/1993 |
| 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 reaction product containing the catalyst, is treated with a p... | 02/11/1992 |
| 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) treating the carboxylic ester which contains an aldehyde, acetal or ... | 08/07/1990 |
| 4927959 | Alprenolol derivatives Novel alprenolol derivatives represented by the formula: ##STR1## wherein R is ##STR2## and hydrochlorides thereof are disclosed.... | 05/22/1990 |
| 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 carbonylation catalyst comprising a Pd compound and a polydentate l... | 08/29/1989 |
| 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 inhibiting amount of the regulator is applied to the plant ab... | 04/04/1989 |
| 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, followed by reaction of resulting monoalkyl maleate with further... | 01/03/1989 |
| 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 minor amount of the corresponding monoalkyl maleate. This... | 08/23/1988 |
| 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 maleate to alkanol and maleic anhydride and without havin... | 04/26/1988 |
| 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 halide is formed under conditions which result in the formati... | 04/05/1988 |
| 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 R1-5 are as defined herein, is recovered essentially free of the (R,S) and (S,R) isomers, by forming a solution of the esters of the (S,S) and the (R,... | 09/17/1985 |
| 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 process wherein the said carboxylates are treated with hydro... | 06/11/1985 |
| 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 ortho-phosphoric acid in certain quantity ratios, an adsorption agent ... | 03/26/1985 |
| 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 chelate compound, removing the unreacted alcohol and hydr... | 03/19/1985 |
| 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, R1 represents the hydrogen atom or a protecting group for the carboxylic acid group, and R2 represents a hy... | 02/19/1985 |
| 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 addition to the carboxyl terminated liquid polymer, a solve... | 04/24/1984 |
| 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 sulfuric acid prior to reaction with the organic diisocyan... | 04/10/1984 |
| 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 C4 -C6 dicarboxylic acid components contained in a waste byproduct stream derived from a reaction system in which adipic acid is produced by nitric acid oxida... | 04/10/1984 |
| 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 effluent, which entrains some of the reactants, is condensed ... | 06/28/1983 |
| 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 Cu2 O or Ag2 O and a fluorinated acetylacetonate of the ... | 05/24/1983 |
| 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, succinic and glutaric acids which would contaminate pure adip... | 03/01/1983 |
| 4365079 | Recovery of dimethyl sebacate from an isomeric mixture of C12 esters Dimethyl sebacate is recovered from a reaction mixture containing it in predominant amount and minor amounts of other dimethyl esters of C10 -dicarboxylic acids by stepwise recrystallization using a solvent selected from the group consisting of... | 12/21/1982 |
| 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 solidify at ambient temperatures. In another embodiment, thi... | 07/13/1982 |
