Patents by Inventor Friedhelm Risse
Friedhelm Risse 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: 9475751Abstract: The present invention relates to a continuous process for producing lower dialkyl carbonates as a main product and alkylene glycol as a by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the necessary purification of the dialkyl carbonate in a subsequent process step. For optimization of the economic efficiency and energy efficiency of the process, additional devices are used for intermediate heating of the internal liquid streams within the apparatus.Type: GrantFiled: November 19, 2013Date of Patent: October 25, 2016Assignee: Covestro Deutschland AGInventors: Pieter Ooms, Friedhelm Risse, Andre Düx, Carsten Buchaly, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack
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Publication number: 20150299097Abstract: The present invention relates to a continuous process for producing lower dialkyl carbonates as a main product and alkylene glycol as a by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the necessary purification of the dialkyl carbonate in a subsequent process step. For optimization of the economic efficiency and energy efficiency of the process, additional devices are used for intermediate heating of the internal liquid streams within the apparatus.Type: ApplicationFiled: November 19, 2013Publication date: October 22, 2015Inventors: Pieter OOMS, Friedhelm RISSE, Andre DÜX, Carsten BUCHALY, Thomas PANCUR, Arthur SUSANTO, Georg RONGE, Johan VANDEN EYNDE, Wim WUYTACK
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Patent number: 8987446Abstract: The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts.Type: GrantFiled: December 9, 2010Date of Patent: March 24, 2015Assignee: Bayer Intellectual Property GmbHInventors: Christoph Gürtler, Thomas Ernst Müller, Pieter Ooms, Johann Rechner, Friedhelm Risse, Angelina Prokofieva, Franco Doro, Burkhard Köhler, Walter Leitner, Aurel Wolf
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Patent number: 8552214Abstract: The present invention relates to a continuous process for preparing lower dialkyl carbonates as main product and alkylene glycol as by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the required purification of the dialkyl carbonate in a subsequent process step. To optimize the economics and energy efficiency of the process, additional devices are used for intermediate heating of the liquid streams in the apparatus.Type: GrantFiled: February 1, 2011Date of Patent: October 8, 2013Assignee: Bayer MaterialScience AGInventors: Pieter Ooms, Friedhelm Risse, Andre Düx, Carsten Buchaly, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack
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Publication number: 20130018186Abstract: The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts.Type: ApplicationFiled: December 9, 2010Publication date: January 17, 2013Applicant: Bayer Intellectual Property GmbHInventors: Christoph Gürtler, Thomas Ernst Müller, Pieter Ooms, Johann Rechner, Friedhelm Risse, Angelina Prokofieva, Franco Doro, Burkhard Köhler, Walter Leitner, Aurel Wolf
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Patent number: 8338631Abstract: The present invention relates to a continuous process for preparing lower dialkyl carbonates as main product and alkylene glycol as by-product by catalyzed transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alcohols, where the reaction of the alkylene carbonate is carried out with an alcohol containing dialkyl carbonate in countercurrent, characterized in that introduction of a stream containing at least 99.5% by weight of alcohol takes place below the point of introduction for the alcohol containing dialkyl carbonate in a particular spacing ratio between the abovementioned points of introduction.Type: GrantFiled: June 25, 2010Date of Patent: December 25, 2012Assignee: Bayer MaterialScience AGInventors: Friedhelm Risse, Pieter Ooms, Andre Düx, Marcus Grünewald, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack
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Patent number: 8304509Abstract: The present invention relates to a process for continuously preparing diaryl carbonates from dialkyl carbonates and at least one monohydroxyl compound in the presence of catalysts, and to the use thereof for preparation of polycarbonates. The alkylene glycol obtained in the preparation of the dialkyl carbonate used is recycled by oxidative carbonylation with carbon monoxide in the presence of a catalyst to give the cyclic alkylene carbonate which is in turn converted to the dialkyl carbonate. More particularly, the process utilizes the alkylene glycol obtained for the diphenyl carbonate preparation process (DPC process).Type: GrantFiled: October 3, 2011Date of Patent: November 6, 2012Assignee: Bayer Intellectual Property GmbHInventors: Christoph Gürtler, Thomas Ernst Müller, Pieter Ooms, Friedhelm Risse, Johann Rechner, Franco Doro, Angelina Prokofieva
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Publication number: 20120130110Abstract: The present invention relates to a process comprising purifying dialkyl carbonates of the formula (II) in one or more columns in the presence of an alkylene oxide of the formula (V) and of an alkyl alcohol of the formula (IV) wherein R1 and R2 represent, independently of one another, linear or branched, substituted or unsubstituted C1-C6-alkyl, R3 and R4 represent, independently of one another, hydrogen, substituted or unsubstituted C1-C4-alkyl, substituted or unsubstituted C2-C4-alkenyl or substituted or unsubstituted C6-C12-aryl, and R5 represents a straight-chain or branched C1-C4-alkyl; and wherein the mean residence time of the dialkyl carbonate in the column(s) is from 0.3 h to 3 h.Type: ApplicationFiled: October 25, 2011Publication date: May 24, 2012Applicant: Bayer MaterialScience AGInventors: Pieter Ooms, Friedhelm Risse, Andre Düx, Carsten Buchaly, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack
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Publication number: 20120101293Abstract: The present invention relates to a continuous process for purifying a dialkyl carbonate/alkyl alcohol mixture in the preparation of dialkyl carbonate by catalysed transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with alkyl alcohols. For the increase in the product quality of the dialkyl carbonate, the selection of the operating parameters of the dialkyl carbonate purification column are crucial, in order to reduce the formation of unwanted by-products such as alkoxy alcohols and aliphatic carbonate ethers.Type: ApplicationFiled: October 25, 2011Publication date: April 26, 2012Applicant: Bayer MaterialScience AGInventors: Pieter Ooms, Friedhelm Risse, Andre Düx, Carsten Buchaly, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack
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Publication number: 20120101247Abstract: The present invention relates to a process for continuously preparing diaryl carbonates from dialkyl carbonates and at least one monohydroxyl compound in the presence of catalysts, and to the use thereof for preparation of polycarbonates. The alkylene glycol obtained in the preparation of the dialkyl carbonate used is recycled by oxidative carbonylation with carbon monoxide in the presence of a catalyst to give the cyclic alkylene carbonate which is in turn converted to the dialkyl carbonate. More particularly, the process utilizes the alkylene glycol obtained for the diphenyl carbonate preparation process (DPC process).Type: ApplicationFiled: October 3, 2011Publication date: April 26, 2012Applicant: Bayer MaterialScience AGInventors: Christoph Gürtler, Thomas Ernst Müller, Pieter Ooms, Friedhelm Risse, Johann Rechner, Franco Doro, Angelina Prokofieva
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Publication number: 20110237819Abstract: The present invention relates to a continuous process for preparing lower dialkyl carbonates as main product and alkylene glycol as by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the required purification of the dialkyl carbonate in a subsequent process step. To optimize the economics and energy efficiency of the process, additional devices are used for intermediate heating of the liquid streams in the apparatus.Type: ApplicationFiled: February 1, 2011Publication date: September 29, 2011Applicant: Bayer MaterialScience AGInventors: Pieter Ooms, Friedhelm Risse, Andre Düx, Carsten Buchaly, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack
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Publication number: 20110144371Abstract: The present invention relates to a special process for purifying dialkyl carbonates. In particular, the present invention relates to a continuous process for purifying a dialkyl carbonate/alcohol-mixture in the preparation of lower dialkyl carbonate by catalysed transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alcohols. To optimize the economics and energy efficiency of the process, an apparatus for intermediate heating of the internal liquid stream is used.Type: ApplicationFiled: November 12, 2010Publication date: June 16, 2011Applicant: Bayer MaterialScience AGInventors: Pieter Ooms, Friedhelm Risse, Andre Düx, Carsten Buchaly, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack
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Publication number: 20110040117Abstract: The present invention relates to a continuous process for preparing lower dialkyl carbonates as main product and alkylene glycol as by-product by catalyzed transesterification of a cyclic alkylene carbonate (e.g. ethylene carbonate or propylene carbonate) with lower alcohols, where the reaction of the alkylene carbonate is carried out with an alcohol containing dialkyl carbonate in countercurrent, characterized in that introduction of a stream containing at least 99.5% by weight of alcohol takes place below the point of introduction for the alcohol containing dialkyl carbonate in a particular spacing ratio between the abovementioned points of introduction.Type: ApplicationFiled: June 25, 2010Publication date: February 17, 2011Applicant: Bayer MaterialScience AGInventors: Friedhelm Risse, Pieter Ooms, Andre Duex, Marcus Grünewald, Thomas Pancur, Arthur Susanto, Georg Ronge, Johan Vanden Eynde, Wim Wuytack
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Patent number: 5563109Abstract: A process for producing a catalytically active gas diffusion electrode, in which process a gas-permeable membrane is first covered by a structuring mask which has recesses in accordance with the planned electrode surfaces. Next, through vapor deposition or cathodic sputtering of a conductive substance in a vacuum, a conductive electrode pattern structured in accordance with the recesses is produced on the membrane. After this, the conductive electrode pattern located on the membrane is galvanically coated with the catalyst by electrolytic deposition and then made hydrophobic.Type: GrantFiled: August 12, 1994Date of Patent: October 8, 1996Assignee: Compur Monitors Sensor TechnologyInventor: Friedhelm Risse
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Patent number: 5487312Abstract: A choke-bypass system is arranged upstream of the gas analyzer so as to generate a constant input pressure at the gas analyzer. The measurement range of the gas analyzer can be expanded considerably beyond the standard range while maintaining accuracy of measurement when the measurement gas is diluted with an inert gas above a given gas concentration threshold in such a way that the gas concentration in the gas analyzer remains constant. To this end, a dilution gas line (12) with a control valve (13) for continuous dilution of the measurement gas with the inert gas is connected to the choke-bypass system (1), (2), (3), (6).Type: GrantFiled: October 7, 1994Date of Patent: January 30, 1996Assignee: Mannesmann AktiengesellschaftInventors: Melchior Kahl, Friedhelm Risse