Patents by Inventor Gabriel Denecker
Gabriel Denecker 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: 10131617Abstract: The invention concerns a method for producing diaryl carbonates from monophenols and phosgene or chloroformic acid aryl esters in the presence of at least one optionally substituted pyridine or the hydrochloride salt thereof as catalyst, and the recovery and reinjection thereof back into the method. The method is carried out at least partially in a liquid phase without the use of an additional solvent, the catalyst being separated by means of distillation and recovered.Type: GrantFiled: May 4, 2015Date of Patent: November 20, 2018Assignee: COVESTRO DEUTSCHLAND AGInventors: Karl-Heinz Köhler, Ricarda Leiberich, Kaspar Hallenberger, Korbinian Krämer, Florian Lipski, Henning Kahnis, Gabriel Denecker, Johan Vanden Eynde, Weerachanan Somhom
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Patent number: 10125083Abstract: The invention concerns a method for producing diaryl carbonates from monophenols and phosgene or chloroformic acid aryl esters in the presence of an optionally substituted pyridine or the hydrochloride salt thereof as catalyst, and the recovery and reinjection thereof back into the method. The method is carried out at least partially in a liquid phase without the use of an additional solvent, the catalyst being separated by means of crystallization and recovered.Type: GrantFiled: May 5, 2015Date of Patent: November 13, 2018Assignee: COVESTRO DEUTSCHLAND AGInventors: Karl-Heinz Köhler, Ricarda Leiberich, Kaspar Hallenberger, Korbinian Krämer, Florian Lipski, Henning Kahnis, Gabriel Denecker, Johan Vanden Eynde, Weerachanan Somhom
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Patent number: 9765012Abstract: The present application relates to a method for the continuous production of diaryl carbonate from phosgene and of at least one monohydroxy compound (monophenol) in the presence of catalysts, and to the use thereof for the production of polycarbonates.Type: GrantFiled: December 17, 2013Date of Patent: September 19, 2017Assignee: Covestro Deutschland AGInventors: Karl-Heinz Köhler, Henning Kahnis, Johan Vanden Eynde, Gabriel Denecker, Ricarda Leiberich, Kaspar Hallenberger, Korbinian Krämer, Florian Lipski
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Publication number: 20170073299Abstract: The invention concerns a method for producing diaryl carbonates from monophenols and phosgene or chloroformic acid aryl esters in the presence of an optionally substituted pyridine or the hydrochloride salt thereof as catalyst, and the recovery and reinjection thereof back into the method. The method is carried out at least partially in a liquid phase without the use of an additional solvent, the catalyst being separated by means of crystallization and recovered.Type: ApplicationFiled: May 5, 2015Publication date: March 16, 2017Inventors: Karl-Heinz Köhler, Ricarda Leiberich, Kaspar Hallenberger, Korbinian Krämer, Florian Lipski, Henning Kahnis, Gabriel Denecker, Johan Vanden Eynde, Weerachanan Somhom
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Publication number: 20170073300Abstract: The invention concerns a method for producing diaryl carbonates from monophenols and phosgene or chloroformic acid aryl esters in the presence of at least one optionally substituted pyridine or the hydrochloride salt thereof as catalyst, and the recovery and reinjection thereof back into the method. The method is carried out at least partially in a liquid phase without the use of an additional solvent, the catalyst being separated by means of distillation and recovered.Type: ApplicationFiled: May 4, 2015Publication date: March 16, 2017Inventors: Karl-Heinz Köhler, Ricarda Leiberich, Kaspar Hallenberger, Korbinian Krämer, Florian Lipski, Henning Kahnis, Gabriel Denecker, Johan Vanden Eynde, Weerachanan Somhom
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Publication number: 20160002143Abstract: The present application relates to a method for the continuous production of diaryl carbonate from phosgene and of at least one monohydroxy compound (monophenol) in the presence of catalysts, and to the use thereof for the production of polycarbonates.Type: ApplicationFiled: December 17, 2013Publication date: January 7, 2016Applicant: BAYER MATERIALSCIENCE AGInventors: Karl-Heinz KÖHLER, Henning KAHNIS, Johan VANDEN EYNDE, Gabriel DENECKER, Ricarda LEIBERICH, Kaspar HALLENBERGER, Korbinian KRÄMER, Florian LIPSKI
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Patent number: 6761828Abstract: Nitrate-containing (contaminated) solutions are reduced with SO2 gas in the presence of an at least equimolar amount of NH4+ or ammonium salt.Type: GrantFiled: March 13, 2002Date of Patent: July 13, 2004Assignee: Bayer AktiengesellschaftInventors: Jürgen Heuser, Werner Verhoeven, Domien Sluyts, Gabriel Denecker
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Publication number: 20020131924Abstract: Nitrate-containing (contaminated) solutions are reduced with SO2 gas in the presence of an at least equimolar amount of NH4+ or ammonium salt.Type: ApplicationFiled: March 13, 2002Publication date: September 19, 2002Inventors: Jurgen Heuser, Werner Verhoeven, Domien Sluyts, Gabriel Denecker
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Patent number: 5786445Abstract: The invention relates to a process for drying polymeric powders and polymeric agglomerates, in particular thermoplastic aromatic polycarbonate or other thermoplastic polymers such as, for example, acrylonitrile-butadiene-styrene copolymer, in the melt, whereby thermoplastic polymeric powders or polymeric agglomerates containing water or solvent or both are freed from adhering moisture and contained solvent, accompanied by melting, in an apparatus provided with rotating baffles for cleaning the walls of the apparatus and for distribution and transport of the material being dried, by heat input through the walls or through the rotating baffles or both as well as by heat input as a result of shearing action. The process of drying and that of melting for the subsequent granulation are thereby combined.Type: GrantFiled: October 2, 1996Date of Patent: July 28, 1998Assignee: Bayer AktiengesellschaftInventors: Claus Wulff, Gottfried Zaby, Thomas Bamberger, Klemens Kohlgruber, Hugo Obermann, Stefaan De Vos, Gabriel Denecker, Johan Vaes, Tony Van Osselaer
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Patent number: 5237046Abstract: The invention relates to a process for stabilizing the molecular weight of high molecular weight, optionally branched polyarylene sulfides prepared by reaction of aromatic dihalogen compounds and, optionally, aromatic trihalogen or tetrahalogen compounds and, optionally, polymer-chain-terminating monomers with alkali metal sulfides and/or alkali metal hydrogen sulfides at elevated temperature in aprotic polar solvents, characterized in that, after the desired molecular weight has been reached, alkali metal sulfides and/or alkali metal hydrogen sulfides present in excess are at least partly reacted with acids to form the alkali metal salts of the acids and hydrogen sulfide.Type: GrantFiled: March 2, 1992Date of Patent: August 17, 1993Assignee: Bayer AktiengesellschaftInventors: Manfred Schmidt, Gabriel Denecker, Wolfgang Jakob, Wolfgang Arlt
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Patent number: 4986742Abstract: High-grade titanium dioxide is produced by(a) reacting ilmenite or titanium-containing slag with sulfuric acid,(b) dissolving the material from (a) with water or dilute sulfuric acid,(c) separating insolubles from (b) to obtain a black solution containing titanyl sulfate and foreign metal salts,extracting titanyl sulfate from the black liquor with sulfuric acid and an organic medium containing an organophosphorus compound, separating the foreign metal salts in an aqueous extract phase, recovering titanyl sulfate from the organic extract phase, andhydrolyzing the titanyl sulfate to titanium oxide hydrate.Type: GrantFiled: August 17, 1989Date of Patent: January 22, 1991Assignee: Bayer AktiengesellschaftInventors: Gabriel Denecker, Werner Verhoeven, Joel Leuridan, Domien Sluyts
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Patent number: 4780540Abstract: Tar-like residues from the preparation of 2-mercaptobenzothiazole can be used by heating them at temperatures above 200.degree. C. for at least 1 hour and separating off the aniline and benzothiazole thereby formed.Type: GrantFiled: February 3, 1987Date of Patent: October 25, 1988Assignee: Bayer AktiengesellschaftInventors: Gabriel Denecker, Guido Lahousse, Henri Vandebroek, Pol Balmelis
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Patent number: 4762931Abstract: An improved work-up of aqueous mother liquors which originate from the oxidative preparation of benzothiazolylsulphenamides and which contain unreacted amine or a low-boiling alcohol employed as solubilizer, or both, the work-up being carried out in such a fashion that the mother liquor is saturated by additives until two phases form, the phases are separated from one another, the aqueous phase is extracted with further alcohol or amine, amine, alcohol and the extracted components are isolated from the combined organic phases, and amine or alcohol dissolved in the aqueous phase is removed therefrom by distillation.Type: GrantFiled: November 24, 1986Date of Patent: August 9, 1988Assignee: Bayer AktiengesellschaftInventors: Gabriel Denecker, Domien Sluyts, Jean-Marie Biot, Tony van Osselaer, Jan de Roos, Pol Bamelis
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Patent number: 4292043Abstract: A process for the working up of ammonium sulphate-containing effluent which is contaminated with organic compounds and optionally also ammonium nitrate, comprising evaporating the effluent to produce water vapor which is removed, a concentrated liquid and a crystal suspension, thickening the suspension to obtain solid ammonium sulphate which is removed and liquid which is recycled to an earlier stage, subjecting the concentrated liquid from evaporation to an optional vacuum cooling crystallization to obtain water vapor which is removed and a crystal suspension from which a concentrated liquid is separated off, advancing the concentrated liquid from the evaporation stage or from the vacuum cooling crystallization stage to a crystallizer, introducing ammonia into the crystallizer to decrease the solubility of the ammonium sulphate, thickening the ammoniacal crystal suspension to obtain ammonium sulphate solids which are removed and ammoniacal mother liquor which is advanced to a distillation step for recovery oType: GrantFiled: January 21, 1980Date of Patent: September 29, 1981Assignee: Bayer AntwerpenInventors: Gabriel Denecker, Domien Sluyts, Roland Putseys, Willy Van Herck, Ludo Claes, Georg Spott