Patents Assigned to DSM Chemie Linz GmbH
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Patent number: 6046042Abstract: A purified (S)-hydroxy-nitrile-lyase is disclosed. Also disclosed is an amino acid sequence for (S)-hydroxy-nitrile-lyase and DNA sequence encoding the same.Type: GrantFiled: December 22, 1997Date of Patent: April 4, 2000Assignee: DSM Chemie Linz GmbHInventors: Meinhard Hasslacher, Michael Schall, Helmut Schwab, Elfriede Marianne Hayn, Sepp Kohlwein, Herfried Griengl
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Patent number: 5898076Abstract: Process for preparing N-pyruvyl-L-proline by reaction of L-proline with methyl pyruvate dimethyl ketal in the presence of an alkali metal alkoxide, subsequent acid hydrolysis and extraction of 1-pyruvyl-L-proline.Type: GrantFiled: August 6, 1998Date of Patent: April 27, 1999Assignee: DSM Chemie Linz GmbHInventors: Karlheinz Giselbrecht, Curt Zimmermann
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Patent number: 5895815Abstract: Process for the purification of 5H-dibenz?b,f!a-zepine, which comprises evaporating 5H-dibenz?b, f!azepine under reduced pressure from a reaction mixture obtained by catalytic dehydrogenation of 10,11-dihydro-5H-dibenz-?b,f!azepine in the 1st step and depositing it as a solid, suspending the deposited product in an aromatic hydrocarbon in the 2nd step and then isolating pure 5H-dibenz?b,f!azepine.Type: GrantFiled: October 2, 1997Date of Patent: April 20, 1999Assignee: DSM Chemie Linz GmbHInventors: Gunter Eichberger, Walter Raml
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Patent number: 5874637Abstract: Process for the purification of o-phthalaldehyde in which an alcoholic solution containing the crude, unpurified o-phthalaldehyde is adjusted to a pH between 0 and 3 at a temperature between 0.degree. and 60.degree. C., then an alkaline solution is added, and the corresponding dialkoxyphthalan is extracted from the organic phase and purified by distillation and, when required, converted into the purified o-phthalaldehyde by hydrolysis.Type: GrantFiled: October 29, 1997Date of Patent: February 23, 1999Assignee: DSM Chemie Linz GmbHInventors: Karl Heinz Giselbrecht, Klaus Reiter, Eduard Perndorfer, Rudolf Hermanseder
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Patent number: 5872153Abstract: A process for preparing an aqueous o-phthalaldehyde-glutaraldehyde solution which comprises converting an acetal of the o-phthalaldehyde in a 10 to 60% strength aqueous glutaraldehyde solution into o-phthalaldehyde at room temperature up to 100.degree. C. by eliminating the corresponding alcohol, and removing the eliminated alcohol to give the aqueous o-phthalaldehyde-glutaraldehyde solution.Type: GrantFiled: November 26, 1997Date of Patent: February 16, 1999Assignee: DSM Chemie Linz GmbHInventors: Karl Heinz Giselbrecht, Eduard Perndorfer
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Patent number: 5756812Abstract: Process for the preparation of pure (S,S)-N-(1-ethoxycarbonyl-3-phenylpropyl) alanine,in which impure (S,S)-N-(1-ethoxycarbonyl-3-phenylpropyl)alanine is suspended in water, dissolved by heating to the boiling point and separated from insoluble impurities by filtration and the desired end product is then precipitated by cooling, filtered off and dried.Type: GrantFiled: February 5, 1997Date of Patent: May 26, 1998Assignee: DSM Chemie Linz GmbHInventors: Kurt Alfred Hackl, Josef Schaller
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Patent number: 5734064Abstract: A process for the preparation of carboxylic acid succinimidyl esters by reaction of N-hydroxysuccinimide with a carboxylic acid and a halophosphoric acid ester of the formula ##STR1## is desired, in which R.sub.1 and R.sub.2 are identical or different and are a C.sub.2 - to C.sub.6 -alkyl radical or a phenyl radical, or R.sub.1 and R.sub.2 The process is carried out in the presence of a base in a diluent at a temperature of 0.degree. C. up to 100.degree. C. with isolation of the corresponding carboxylic acid succinimidyl ester.Type: GrantFiled: April 4, 1997Date of Patent: March 31, 1998Assignee: DSM Chemie Linz GmbHInventors: Peter Pochlauer, Wolfram Hendel, Christian Burger, Anita Lamplmayr, Harald Poschko, Antonia Praus, Gerald Summer
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Patent number: 5723612Abstract: Process for the preparation of pure 4,6-dichloropyrimidine by reaction of 4,6-dihydroxypyrimidine with an excess of phosphorus oxychloride at 20.degree. C. up to reflux temperature, in the presence of a trialkylamine as acid scavenger and catalyst.Type: GrantFiled: June 3, 1996Date of Patent: March 3, 1998Assignee: DSM Chemie Linz GmbHInventors: Wolfgang Huber, Franz Thomas Schwarz, Ferdinand Heu
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Patent number: 5723661Abstract: A process for preparing high-purity calcium pyruvate or its hydrates by reacting an aqueous solution of pyruvic acid with an inorganic calcium compound with the pH being set to 2 to 7, preferably 2.5 to 4, which comprises reacting an up to 10% strength aqueous solution of pyruvic acid with the calcium compound, in the presence or absence of a stabilizer or complexing agent, and mixing the resulting solution with an organic diluent at temperatures of 0.degree. to 30.degree. C. and isolating the resulting precipitate of calcium pyruvate or its hydrate from the solution.Type: GrantFiled: March 11, 1997Date of Patent: March 3, 1998Assignee: DSM Chemie Linz GmbHInventors: Curt Zimmermann, Kurt Weissenbock
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Patent number: 5714356Abstract: Process for preparing (S)-cyanohydrins by reacting aldehydes or asymmetrical, aliphatic ketones with hydrocyanic acid in the presence of the (S)-oxynitrilase from Hevea brasiliensis at temperatures of up to at most 10.degree. C.Type: GrantFiled: June 19, 1995Date of Patent: February 3, 1998Assignee: DSM Chemie Linz GmbHInventors: Herfried Griengl, Nongyuan Shi, Ulrike Pichler, Norbert Klempier, Peter Pochlauer
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Patent number: 5710359Abstract: Process for the environmentally appropriate degradation of chemical compounds which have one or more heteroatoms X, with X being F, Cl, Br, I, N, O or S, by cleavage of the C--X carbon-heteroatom bonds, characterized in that the chemical compounds or articles which contain the chemical compounds are treated with water vapor in the presence of an aluminum catalyst at 300.degree.-600.degree. C.Type: GrantFiled: December 13, 1995Date of Patent: January 20, 1998Assignee: DSM Chemie Linz GmbHInventors: Johannes Lercher, Zhan Zhaoqui
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Patent number: 5686625Abstract: Process for the preparation of an N-substituted glycine ester or an N-substituted glycine acid by reaction of a glyoxylic acid ester half-acetal (hemiacetal) or glyoxylic acid half-acetal (hemiacetal) with an amine and hydrogenation of the intermediate product formed by this reaction, and the use of the process in a process for the preparation of indoxyl and indigo derivatives by cyclization of an N-arylglycine ester, prepared by the above process, in a molten alkali metal carbonate or alkaline earth metal carbonate with or without addition of an alkali metal amide, and if appropriate oxidation of the indoxyl derivative formed by this reaction to give the corresponding indigo derivative.Type: GrantFiled: June 5, 1996Date of Patent: November 11, 1997Assignee: DSM Chemie Linz GmbHInventor: Carlo Kos
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Patent number: 5686638Abstract: Process for the preparation of aliphatic or aromatic mono- or dicarboxylic acids of 4 to 22 carbon atoms by oxidation of the corresponding aldehydes having the same number of carbon atoms in a carboxylic acid from the group consisting of formic acid, acetic acid, and propionic acid or in a carboxylic acid/water mixture at a temperature of 50.degree.-130.degree. C. and at 1 to 25 bar and in the presence of an oxidizing agent.Type: GrantFiled: September 5, 1995Date of Patent: November 11, 1997Assignee: DSM Chemie Linz GmbHInventors: Carlo Kos, Manfred Schoftner, Johann Friedhuber
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Patent number: 5659076Abstract: A process for the transesterification of dimethyl succinylsuccinate with one or more aliphatic alcohols which in each case have at least 2 C atoms, in the presence of an acidic catalyst and in the presence or absence of a diluent which is inert under the reaction conditions, with exclusion of oxygen and under pressure, at least one of the two methoxy groups being replaced by the oxy group corresponding to the alcohol used and use of the process in a process for the preparation of terephthalic acids and of quinacridones.Type: GrantFiled: August 25, 1995Date of Patent: August 19, 1997Assignee: DSM Chemie Linz GmbHInventors: Franz Thomas Schwarz, Johann Altreiter, Franz Mostl
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Patent number: 5639662Abstract: Process for enhancement of enantioselectivity in the enzymatic separation of (R)- and (S)-enantiomers of an asymmetric alkynol, a lipase and in the presence of at least one vinyl ester, in which the acid component has at least 4 C atoms, an organic solvent and with the addition of water. Also disclosed is a process for enhancement of enantioselectivity in the enzymatic separation of (R)- and (S)-enantiomers of an alcohol with the aid of the abovementioned vinyl ester under addition of a second vinyl ester having at least 2 C atoms less in the alkyl chain than the vinyl ester used as esterifying agent.Type: GrantFiled: September 18, 1995Date of Patent: June 17, 1997Assignee: DSM Chemie Linz GmbHInventors: Herbert Mayrhofer, Irma Wirth, Peter Pochlauer
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Patent number: 5629397Abstract: 2,6-dimethylphenylmaleimide is used as a comonomer for the preparation of styrene copolymers and vinyl chloride copolymers having an increased glass transition temperature and low intrinsic coloration compared with the prior art.Type: GrantFiled: February 14, 1996Date of Patent: May 13, 1997Assignee: DSM Chemie Linz GmbHInventors: Gerhard Steinbauer, Jan Bartus, Heinrich Horacek, Otto Vogl, Gerhard Stern
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Patent number: 5597917Abstract: A process for the dissolution of chemical compounds by use of ureas in which at least one of the urea's two nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom as a chemical solvent, and a method of producing tri- or tetraalkylated ureas or bis ureas wherein at least one of the urea's nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom by means of dialkylating the --NH.sub.2 group of a urea with an alkene or alkene arylene alkene dihalogenide, disulphonate or dihydrogen sulphonate in the presence of a solid base and a phase-transfer catalyst.Type: GrantFiled: January 30, 1995Date of Patent: January 28, 1997Assignee: DSM Chemie Linz GmbHInventors: Kurt A. Hackl, Markus R ossler, Martin M ullner, Gerhard Stern
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Patent number: 5578723Abstract: A process for preparing cyanuric acid by cooling an isocyanuric acid/ammonia gas mixture having a temperature of 300.degree. to 480.degree. C. to 200.degree.-300.degree. C., whereupon cyanuric acid is separated off and isolated at this temperature in an apparatus suitable for separating solids from gases, and unreacted isocyanuric acid/ammonia gas mixture is recycled or further processed.Type: GrantFiled: July 21, 1995Date of Patent: November 26, 1996Assignee: DSM Chemie Linz GmbHInventors: Erich Schulz, Georg H aubl, Martin M ullner
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Patent number: 5563270Abstract: Process for the preparation of 2-amino-4,6-dichloropyrimidine by reaction of 2-amino-4,6-dihydroxypyrimidine with an excess of phosphorus oxychloride at 20 to 80.degree. C. and in the presence of triethylamine as the acid-trapping agent.Type: GrantFiled: May 12, 1995Date of Patent: October 8, 1996Assignee: DSM Chemie Linz GmbHInventors: Franz-Thomas Schwarz, Johann Altreiter