Patents by Inventor Andre Dux
Andre Dux 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: 9040732Abstract: The invention provides a process for preparing diaryl carbonates from dialkyl carbonates and aromatic hydroxyl compounds using at least two reaction columns, a process section for recovering the dialkyl carbonate used in the reaction and for removing the alcohol of reaction, one or more process steps for removing the by-products obtained in the process which have a boiling point between that of the dialkyl carbonate and that of the alkyl aryl carbonate formed during the preparation of the diaryl carbonate, and a process step for further purification of the diaryl carbonate obtained from the reaction columns.Type: GrantFiled: June 12, 2009Date of Patent: May 26, 2015Assignee: Bayer MaterialScience AGInventors: Andre Düx, Guenter Olf, Kaspar Hallenberger, Georg Ronge, Ricarda Leiberich, Johan Vanden Eynde, Wim Wuytack, Pieter Ooms, Johann Rechner
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Patent number: 8952189Abstract: The invention relates to a process for preparing diaryl carbonates and/or alkyl aryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using a reactive dividing wall column.Type: GrantFiled: April 7, 2010Date of Patent: February 10, 2015Assignee: Bayer MaterialScience AGInventors: Andre Düx, Helmut Mothes, Kaspar Hallenberger, Georg Ronge, Rafael Warsitz, Pieter Ooms, Johann Rechner
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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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Patent number: 8455691Abstract: Aromatic amines which have been obtained by reduction of aromatic nitro compounds are purified by mixing the crude amine obtained after phase separation with an aqueous, alkali metal hydroxide solution and subsequent distillation of this mixture over a distillation column. The distillation column has at least an upper and a lower rectifying part and a stripping part. The bottom product of the distillation column is partly to completely sluiced out and is partly evaporated in a main evaporator and at least one downstream re-evaporator and partly recycled back into the column.Type: GrantFiled: August 15, 2008Date of Patent: June 4, 2013Assignee: Bayer MaterialScience AGInventors: Knut Sommer, Franz-Ulrich Gehlen, Peter Lehner, Andre Düx, Benie Marotz
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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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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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Patent number: 8039659Abstract: Processes comprising: reacting a dialkyl carbonate and an aromatic hydroxy compound in the presence of a transesterification catalyst in a first reaction column, the first reaction column comprising a top section, a bottom section, a rectifying section in an upper portion of the column and a reaction zone below the rectifying section; feeding a bottom product from the first reaction column to a further reaction column; the bottom product comprising a diaryl carbonate, an alkylaryl carbonate, or both, and residual unreacted dialkyl carbonate and aromatic hydroxy compound; the further reaction column comprising a top section, a rectifying section in an upper portion of the column and a reaction zone below the rectifying section; and reacting the residual unreacted dialkyl carbonate and aromatic hydroxy compound in the further reaction column; feeding a process stream to a distillation column, the process stream comprising a mixture of unreacted dialkyl carbonate and one or more reaction-product alcohols drawn fType: GrantFiled: September 15, 2008Date of Patent: October 18, 2011Assignee: Bayer MaterialScience AGInventors: Andre Düx, Pieter Ooms, Johann Rechner, Matthias Böhm, Kaspar Hallenberger, Georg Ronge, Johan Vanden Eynde
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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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Patent number: 8022240Abstract: Processes comprising: transesterifying a dialkyl carbonate and an aromatic hydroxyl compound in the presence of a transesterification catalyst to provide a diaryl carbonate product comprising the transesterification catalyst as an impurity; subjecting the diaryl carbonate product to distillation in a first distillation column having an upper part and a lower part, wherein the upper part comprises a rectifying section and the lower part comprises a stripping section; and withdrawing a first sidestream from the first distillation column, wherein the first sidestream comprises a purified diaryl carbonate.Type: GrantFiled: November 20, 2008Date of Patent: September 20, 2011Assignee: Bayer MaterialScience AGInventors: Pieter Ooms, Johann Rechner, Matthias Böhm, Andre Düx, Kaspar Hallenberger, Georg Ronge, Johan Vanden Eynde
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Publication number: 20110206568Abstract: The invention provides a process for the preparation of diaryl carbonates and/or alkylaryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using one or more intermediate condensers for improving heat integration.Type: ApplicationFiled: May 6, 2011Publication date: August 25, 2011Applicant: Bayer MaterialScience AGInventors: Andre Düx, Pieter Ooms, Johann Rechner, Kaspar Hallenberger, Georg Ronge, Johan Vanden Eynde
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Patent number: 8003817Abstract: The invention provides a process for the preparation of diaryl carbonates and/or alkylaryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using one or more intermediate condensers for improving heat integration.Type: GrantFiled: May 16, 2008Date of Patent: August 23, 2011Assignee: Bayer MaterialScience AGInventors: Andre Düx, Pieter Ooms, Johann Rechner, Kaspar Hallenberger, Georg Ronge, Johan Vanden Eynde
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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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PROCESS FOR HETEROGENEOUSLY CATALYZED ESTERIFICATION OF (METH)ACRYLIC ACID WITH OXYALKYLATED POLYOLS
Publication number: 20110028754Abstract: The present invention relates to a process for heterogeneously catalyzed partial esterification of (meth)acrylic acid with oxyalkylated polyols, wherein the oxyalkylated polyols have at least 3 free hydroxyl groups, and wherein the catalyst is selected from the group comprising acidic ion exchange resins and/or acidic zeolites. The invention further relates to (meth)acrylic esters and urethane acrylates, obtained by a process according to the present invention, and to the use thereof as radiation-curable compounds.Type: ApplicationFiled: July 29, 2008Publication date: February 3, 2011Applicant: Bayer MaterialScience AGInventors: Michael Ludewig, Jan Weikard, Andre Düx, Benie Marotz, Georg Ronge, Aurel Wolf -
Publication number: 20100261928Abstract: The invention relates to a process for preparing diaryl carbonates and/or alkyl aryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using a reactive dividing wall column.Type: ApplicationFiled: April 7, 2010Publication date: October 14, 2010Applicant: Bayer MaterialScience AGInventors: Andre DÜX, Helmut Mothes, Kaspar Hallenberger, Georg Ronge, Rafael Warsitz, Pieter Ooms, Johann Rechner
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Publication number: 20100010252Abstract: The invention provides a process for preparing diaryl carbonates from dialkyl carbonates and aromatic hydroxyl compounds using at least two reaction columns, a process section for recovering the dialkyl carbonate used in the reaction and for removing the alcohol of reaction, one or more process steps for removing the by-products obtained in the process which have a boiling point between that of the dialkyl carbonate and that of the alkyl aryl carbonate formed during the preparation of the diaryl carbonate, and a process step for further purification of the diaryl carbonate obtained from the reaction columns.Type: ApplicationFiled: June 12, 2009Publication date: January 14, 2010Applicant: Bayer MaterialScience AGInventors: Andre Düx, Guenter Olf, Kaspar Hallenberger, Georg Ronge, Ricarda Leiberich, Johan Vanden Eynde, Wim Wuytack, Pieter Ooms, Johann Rechner
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Publication number: 20090137832Abstract: Processes comprising: transesterifying a dialkyl carbonate and an aromatic hydroxyl compound in the presence of a transesterification catalyst to provide a diaryl carbonate product comprising the transesterification catalyst as an impurity; subjecting the diaryl carbonate product to distillation in a first distillation column having an upper part and a lower part, wherein the upper part comprises a rectifying section and the lower part comprises a stripping section; and withdrawing a first sidestream from the first distillation column, wherein the first sidestream comprises a purified diaryl carbonate.Type: ApplicationFiled: November 20, 2008Publication date: May 28, 2009Applicant: Bayer MaterialScience AGInventors: Pieter Ooms, Johann Rechner, Matthias Bohm, Andre Dux, Kaspar Hallenberger, Georg Ronge, Johan Vanden Eynde
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Publication number: 20090076293Abstract: Processes comprising: reacting a dialkyl carbonate and an aromatic hydroxy compound in the presence of a transesterification catalyst in a first reaction column, the first reaction column comprising a top section, a bottom section, a rectifying section in an upper portion of the column and a reaction zone below the rectifying section; feeding a bottom product from the first reaction column to a further reaction column; the bottom product comprising a diaryl carbonate, an alkylaryl carbonate, or both, and residual unreacted dialkyl carbonate and aromatic hydroxy compound; the further reaction column comprising a top section, a rectifying section in an upper portion of the column and a reaction zone below the rectifying section; and reacting the residual reacted dialkyl carbonate and aromatic hydroxy compound in the further reaction column; feeding a process stream to a distillation column, the process stream comprising a mixture of unreacted dialkyl carbonate and one or more reaction-product alcohols drawn froType: ApplicationFiled: September 15, 2008Publication date: March 19, 2009Applicant: Bayer MaterialScience AGInventors: Andre Dux, Pieter Ooms, Johann Rechner, Matthias Bohm, Kaspar Hallenberger, Georg Ronge, Johan Vanden Eynde