Patents by Inventor Hans-Jürgen Weyer
Hans-Jürgen Weyer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6554966Abstract: The invention relates to a process for preparing essentially formic acid-free N-alkyl-N′-methylalkyleneureas of the formula with R1=H or CH3, R2=CnH2n+1 with n=1-4 and x=0 or 1, from the corresponding alkyleneureas by reaction with monomeric or polymerized formaldehyde in the presence of formic acid. This entails feeding the mixture, obtained in the reaction, of N-alkyl-N′-methylalkyleneurea and formic acid to the upper region of a distillation column, distilling without further additions and removing essentially formic acid-free N-alkyl-N′-methylalkyleneurea in the lower region of the column.Type: GrantFiled: June 26, 2000Date of Patent: April 29, 2003Assignee: BASF AktiengesellschaftInventors: Andreas Kramer, Johann-Peter Melder, Heinz Rütter, Günter Riewe, Wolfgang Siegel, Hans-Jürgen Weyer
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Patent number: 6291731Abstract: In a continuous process for preparing propargyl chloride by reacting propargyl alcohol with a chlorinating agent in the presence of a catalyst, the chlorinating agent, propargyl alcohol and from 0.1 to 10 mol % of the catalyst, based on the amount of propargyl alcohol, are continuously metered into a reaction zone and reacted at from 40 to 70° C.Type: GrantFiled: August 29, 2000Date of Patent: September 18, 2001Assignee: BASF AktiengesellschaftInventors: Armin Stamm, Jochem Henkelmann, Hans-Jürgen Weyer
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Patent number: 6262300Abstract: The present invention provides process for the preparation of chlorocarbonyl chlorides of the formula I R1—CHCl—Y—COCl (I), where R1 is for example hydrogen or C1- to C20-alkyl and Y is for example a saturated or mono- or polyolefinically unsaturated C2-C8-alkylene chain, by reacting lactones with a chlorinating agent in the presence of a urea compound.Type: GrantFiled: April 20, 2000Date of Patent: July 17, 2001Assignee: BASF AktiengesellschaftInventors: Hans-Jürgen Weyer, Armin Stamm, Theodor Weber, Jochem Henkelmann
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Patent number: 6245954Abstract: The present invention relates to a process for preparing alkyl, alkenyl and alkynyl chlorides from alcohols by reaction with a chlorinating agent in the presence of a catalyst, wherein the catalyst is a urea compound.Type: GrantFiled: November 20, 2000Date of Patent: June 12, 2001Assignee: BASF AktiengesellschaftInventors: Hans-Jürgen Weyer, Armin Stamm, Theodor Weber, Jochem Henkelmann
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Patent number: 6242639Abstract: A method for preparing neopentyl glycol hydroxypivalate granules by application of a neopentyl glycol hydroxypivalate melt (1) onto a cooling belt (6) on which the melt solidifies, wherein the melt contains at least so 3 wt % of neopentyl glycol hydroxypivalate crystals, based on the total amount of neopenlyl glycol hydroxypivalate.Type: GrantFiled: September 9, 1997Date of Patent: June 5, 2001Assignee: BASF AktiengesellschaftInventors: Hans-Jürgen Weyer, Bernd Eck, Dieter Baumann, Bernhard Maltry
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Patent number: 5714638Abstract: Polyoxyalkylene glycol monoethers of monohydric alcohols are prepared by a process in which tetrahydrofuran or a mixture of tetrahydrofuran with a total of not more than 95 mol %, based on the amount of tetrahydrofuran used, of one or more comonomers from the group consisting of the cyclic ethers and acetals is polymerized in the absence of water and in the presence of a monohydric alcohol and of an anhydrous heteropoly acid catalyst.Type: GrantFiled: February 1, 1995Date of Patent: February 3, 1998Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Gerhard Jeschek, Herbert Mueller
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Patent number: 5659068Abstract: Polyoxyalkylene glycol monoesters of carboxylic acids are prepared by a process in which tetrahydrofuran or a mixture of tetrahydrofuran with a total of not more than 95 mol %, based on the amount of tetrahydrofuran used, of one or more comonomers from the group consisting of the cyclic ethers and acetals is polymerized in the absence of water and in the presence of a carboxylic acid and of an anhydrous heteropolyacid catalyst.Type: GrantFiled: May 31, 1994Date of Patent: August 19, 1997Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Gerhard Jeschek, Herbert Mueller
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Patent number: 5561217Abstract: A process for the preparation of polyoxyalkylene glycols or polyoxyalkylene glycol copolymers from polyoxyalkylene glycol formates or the formates of polyoxyalkylene glycol copolymers comprises reacting the formates of polyoxyalkylene glycols or of polyoxyalkylene glycol copolymers in the liquid phase in the presence of a heterogeneous catalyst which contains, as catalytically active component, rhenium and/or at least one element from sub-group VIII of the Periodic Table of the Elements.Type: GrantFiled: April 24, 1995Date of Patent: October 1, 1996Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Rolf Pinkos
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Patent number: 5536854Abstract: 2-Methyl-1,4-butanediol and 3-methyltetrahydrofuran are prepared by reacting a compound of the general formula I or II ##STR1## where R.sup.1 and R.sup.2 are each hydrogen or C.sub.1 -C.sub.8 -alkyl and the formyl group of II may also be present as acetal with a C.sub.1 -C.sub.8 -alkanol, is reacted with hydrogen in the presence of copper or of a metal of groups 7 to 10 of the Periodical Table of elements or of a compound of these metals.Type: GrantFiled: January 26, 1995Date of Patent: July 16, 1996Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Franz Merger, Juergen Frank, Jochem Henkelmann, Hardo Siegel, Thomas Ruehl
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Patent number: 5434273Abstract: The preparation of N-substituted 2-pyrrolidones (I) by the reaction of maleic acid, fumaric acid, or succinic acid or functional derivatives of these acids (compounds II) with a primary amine (III) or by the reaction of amides or imides derived from II and III under hydrogenating conditions in a synthesis stage followed by isolation, by distillation, of I and other volatile components from the resulting reaction mixture, in which the residues present following distillation are subjected to further hydrogenation treatment and the compound (I) thus formed is isolated by distillation.Type: GrantFiled: February 4, 1994Date of Patent: July 18, 1995Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer
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Patent number: 5416240Abstract: Polyoxyalkylene glycols are prepared by a process in which tetrahydrofuran is polymerized with a total of not more than 95 mol %, based on the amount of tetrahydrofuran used, of one or more comonomers from the group consisting of the cyclic ethers and acetals in the absence of water and in the presence of a monohydric alcohol or of a monocarboxylic acid with the aid of an anhydrous heteropoly acid catalyst, and the polyoxyalkylene glycol is liberated from the resulting polyoxyalkylene glycol monoethers or polyoxyalkylene glycol monoesters by cleavage of the monoether or monoester bond.Type: GrantFiled: March 2, 1993Date of Patent: May 16, 1995Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Gerhard Jeschek, Franz Merger, Herbert Mueller
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Patent number: 5414143Abstract: Polyoxyalkylene glycol monoethers of monohydric alcohols are prepared by a process in which tetrahydrofuran or a mixture of tetrahydrofuran with a total of not more than 95 mol %, based on the amount of tetrahydrofuran used, of one or more comonomers from the group consisting of the cyclic ethers and acetals is polymerised in the absence of water and in the presence of a monohydric alcohol and of an anhydrous heteropoly acid catalyst.Type: GrantFiled: March 2, 1993Date of Patent: May 9, 1995Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Gerhard Jeschek, Herbert Mueller
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Patent number: 5395959Abstract: The average molecular weight of polyoxyalkylene glycols and polyoxyalkylene glycol derivatives is adjusted in the heteropolyacid-catalyzed polymerization of cyclic ethers and/or acetals with ring cleavage in the presence of proton donors by a process in which the amount of the relevant proton donor present in the reaction system is regulated in the course of the reaction by the measurement of the electrical conductivity.Type: GrantFiled: August 20, 1993Date of Patent: March 7, 1995Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Gerhard Jeschek, Herbert Mueller
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Patent number: 5391771Abstract: A process for the preparation of propane-1,2,3-tricarboxylic acid, tetrahydrofurfurylacetic acid and the C.sub.1 - to C.sub.20 -alkyl or C.sub.7 - to C.sub.12 -aralkyl esters thereof, propane-1,2,3-trimethanol, 3-methyltetrahydrofuran, 3-(2'-hydroxyethyl)tetrahydrofuran, 4-hydroxymethyltetrahydropyran, 2-methyl-.gamma.-butyrolactone and/or 3-methyl-.gamma.-butyrolactone, comprises reacting citric acid or the C.sub.1 - to C.sub.20 -alkyl or C.sub.7 - to C.sub.12 -aralkyl esters thereof on hydrogenation catalysts in non-aqueous solvents at from 50.degree. to 400.degree. C. and at from 1 to 400 bar.Type: GrantFiled: September 30, 1993Date of Patent: February 21, 1995Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Christoph Sigwart
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Patent number: 5387701Abstract: A process for preparing 4-hydroxymethyltetrahydropyran comprises reacting tetrahydrofurans of the general formula I ##STR1## where R.sup.1 is hydrogen, C.sub.1 - to C.sub.6 -alkyl or --CO--R.sup.2, andR.sup.2 is hydrogen or C.sub.1 - to C.sub.6 -alkyl,at from 0.degree. to 400.degree. C. and from 0.001 to 400 bar in the presence of acidic catalysts.Type: GrantFiled: September 30, 1993Date of Patent: February 7, 1995Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Werner Schnurr, Norbert Goetz, Thomas Kuekenhoehner
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Patent number: 5371242Abstract: Abstract of the Disclosure: Products of the reduction of 4-hydroxybutyric acid derivatives of the formula IIa ##STR1## where one of A and B is methylene and the other is cyclopropylidene, or of C.sub.1 --C.sub.4 --alkyl esters (IIb) or lactones (IIc) of these acids IIa, are prepared by hydrogenating the compounds IIa or IIb or IIc catalytically using hydrogen in the presence of a heterogeneous hydrogenation catalyst, giving novel compounds which can be used to prepare polymers.Type: GrantFiled: August 23, 1993Date of Patent: December 6, 1994Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer, Werner Schnurr, Norbert Goetz, Thomas Kuekenhoehner
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Patent number: 5276165Abstract: A process for the preparation of N-substituted lactams of the formula I ##STR1## where Z is C.sub.2 - to C.sub.10 -alkylene, C.sub.7 - to C.sub.12 -aralkylene, phenylene or naphthylene, andR.sup.1 is C.sub.1 - to C.sub.20 -alkyl, C.sub.6 - to C.sub.10 -aryl or C.sub.7 - to C.sub.12 -aralkyl,by hydrogenating a compound of the formula II ##STR2## where W is C.sub.2 - to C.sub.10 -alkylene, C.sub.2 - to C.sub.10 -alkenylene, C.sub.7 - to C.sub.12 -aralkylene, phenylene or naphthylene, andX and Y together form an oxa or imido bridge of the formula ##STR3## or alternatively are identical or different and are hydroxyl, C.sub.1 - to C.sub.20 -alkoxy, C.sub.6 - to C.sub.10 -aryloxy or C.sub.7 - to C.sub.12 -aralkoxy, and, if X and Y are different, Y, in addition to the abovementioned meanings, may also be hydrogen,at superatmospheric pressure and at elevated temperature in the presence of a catalyst and in the presence of an amine, which comprises using a secondary and/or tertiary amine of the formula IIINH.sub.n R.Type: GrantFiled: November 25, 1992Date of Patent: January 4, 1994Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Weyer, Rolf Fischer
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Patent number: 5157127Abstract: A process for the preparation of N-substituted pyrrolidones by the catalytic hydrogenation of maleic anhydride, maleic acid and/or fumaric acid in the presence of a primary amine and a solvent, at elevated temperature and pressure, wherein a catalyst is used which contains cobalt and at least one of the elements manganese, copper, phosphorus, molybdenum and/or sodium.Type: GrantFiled: June 4, 1991Date of Patent: October 20, 1992Inventors: Hans-Juergen Weyer, Rolf Fischer, Wolfgang Harder
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Patent number: 5099074Abstract: A process for the preparation of polyether glycols by polymerization of tetrahydrofuran or copolymerization of tetrahydrofuran with oxiranes in the presence of from 20 to 500% w/w of a hydrocarbon, based on the weight of tetrahydrofuran used.Type: GrantFiled: October 26, 1990Date of Patent: March 24, 1992Assignee: BASF AktiengesellschaftInventors: Herbert Mueller, Gerhard Jeschek, Rolf Fischer, Hans-Juergen Weyer
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Patent number: 5097077Abstract: A process is described for the purification of crude polyalkylene ether glycols contaminated by heteropolyacids or salts thereof, by treatment with solvents, which comprises mixing the crude polyalkylene ether glycols with a liquid hydrocarbon and water, allowing the phases to separate, and isolating the purified polyalkylene ether glycols from the upper phase.Type: GrantFiled: October 5, 1990Date of Patent: March 17, 1992Assignee: BASF AktiengesellschaftInventors: Herbert Mueller, Gerhard Jeschek, Rolf Fischer, Hans-Juergen Weyer