Patents by Inventor Kirsten Wenz
Kirsten Wenz 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: 7541497Abstract: A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile, by contacting the vaporous product of the ammoxidation stage directly with a liquid organic solvent (quench), and hydrogenating the phthalonitrile in the resulting quench solution or suspension, wherein the organic solvent is N-methyl-2-pyrrolidone (NMP).Type: GrantFiled: August 27, 2004Date of Patent: June 2, 2009Assignee: BASF AktiengesellschaftInventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preiss, Alexander Weck
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Patent number: 7528284Abstract: A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile and hydrogenating the phthalonitrile, which comprises contacting the vaporus product of the ammoxidation stage directly with a liquid organic solvent or with molten phthalonitrile (quench), partly or fully removing components having a boiling point lower than phthalonitrile (low boilers) from the resulting quench solution or suspention or phthalonitrile melt and, before the hydrogenation, of the phthalonitrile, not removing any products having a boiling point higher than phthalonitrile (high boilers).Type: GrantFiled: September 4, 2004Date of Patent: May 5, 2009Assignee: BASF AktiengesellschaftInventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preiss, Alexander Weck
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Publication number: 20080214871Abstract: A process for preparing a xylylenediamine by heterogeneously catalyzed hydrogenation of a phthalonitrile, wherein the hydrogenation is carried out in the presence of a cobalt skeletal catalyst, of an alkali metal hydroxide and of an alcohol and/or ether as the solvent, at an absolute pressure in the range from 1 to 100 bar and a temperature in the range from 40 to 150° C.Type: ApplicationFiled: January 19, 2006Publication date: September 4, 2008Applicant: BASF AktiengesellschaftInventors: Martin Ernst, Thilo Hahn, Kirsten Wenz, Randolf Hugo, Johann-Peter Melder
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Publication number: 20080154061Abstract: A process for preparing a xylylenediamine by heterogeneously catalyzed hydrogenation of a phthalonitrile, wherein the hydrogenation is carried out in the presence of a nickel catalyst, of water, of an alkali metal hydroxide and of an ether as a solvent, at an absolute pressure in the range from 1 to 100 bar, at a temperature in the range from 40 to 150° C. and without addition of ammonia.Type: ApplicationFiled: February 23, 2006Publication date: June 26, 2008Applicant: BASF AktiengesellschaftInventors: Martin Ernst, Kirsten Wenz, Randolf Hugo, Johann-Peter Melder, Thilo Hahn
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Patent number: 7381845Abstract: A process for hydrogenating nitrile functions present in organic compounds over at least one heterogeneous catalyst, in which the hydrogenation is carried out in the presence of an ionic liquid, is described.Type: GrantFiled: December 20, 2004Date of Patent: June 3, 2008Assignee: BASF AktiengesellschaftInventors: Verena Weiskopf, Till Gerlach, Kirsten Wenz
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Patent number: 7368610Abstract: A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile and hydrogenating the phthalonitrile, which comprises contacting the vaporous product of the ammoxidation stage directly with a liquid organic solvent or with molten phthalonitrile (quench), partly or fully removing components having a boiling point lower than phthalonitrile (low boilers) from the resulting quench solution or suspension or phthalonitrile melt and, after the low boiler removal and before the hydrogenation, removing products having a boiling point higher than phthalonitrile (high boilers).Type: GrantFiled: September 4, 2004Date of Patent: May 6, 2008Assignee: BASF AktiengesellschaftInventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preiss, Alexander Weck
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Publication number: 20080091049Abstract: The invention relates to a method for producing xylylenediamine, comprising the following steps: ammonoxidation of xylol to form phthalodinitrile and hydrogenation of the phthalodinitrile, whereby the vaporous product of the ammonoxidation stage is directly brought into contact with a liquid organic solvent or with melted phthalodinitrile (quench); constituents having a boiling point lower than that of phthalodinitrile (low boilers) are partially or completely separated out from the obtained quench solution or suspension or phthalodinitrile melt, and; before the hydrogenation of the phthalodinitrile, no products having a boiling point higher than that of phthalodinitrile (high boilers) are separated out.Type: ApplicationFiled: September 4, 2004Publication date: April 17, 2008Applicant: BASF AktiengesellschaftInventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preisss, Alexander Weck
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Patent number: 7339080Abstract: A process for preparing xylylenediamine by continuously hydrogenating liquid phthalonitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, which comprises mixing a stream of a phthalonitrile melt in liquid form by means of a mixer unit with a stream of liquid ammonia and conducting the liquid mixture into the hydrogenation reactor.Type: GrantFiled: September 9, 2004Date of Patent: March 4, 2008Assignee: BASF AktiengesellschaftInventors: Randolf Hugo, Kirsten Wenz, Rolf Wambsganβ, Sabine Jourdan, Thomas Preiss
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Patent number: 7323598Abstract: A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile by contacting the vaporous product of this ammoxidation stage directly with a liquid organic solvent (quench), removing products having a boiling point higher than phthalonitrile (high boilers) from the resulting quench solution or suspension and hydrogenating the phthalonitrile, wherein the organic solvent used for the quench is N-methyl-2-pyrrolidone (NMP), after the removal of the high boilers and before the hydrogenation, there is a partial or complete removal of the NMP and/or of products having a boiling point lower than phthalonitrile (low boilers) and the phthalonitrile for the hydrogenation step is dissolved or suspended in an organic solvent or in liquid ammon.Type: GrantFiled: September 4, 2004Date of Patent: January 29, 2008Assignee: BASF AktiengesellschaftInventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preiss, Alexander Weck
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Patent number: 7323597Abstract: A process for preparing xylylenediamine by continuously hydrogenating liquid phthalonitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, in which a portion of the reactor effluent is recycled as a liquid circulation stream continuously to the reactor inlet (circulation mode), in which a stream of a phthalonitrile melt in liquid form is conducted by means of a mixer unit into the circulation stream around the hydrogenation reactor, the phthalonitrile conversion in the reactor on single pass being greater than 99%, and the circulation stream consisting to an extent of greater than 93% by weight of liquid ammonia and xylylenediamine and not comprising any further solvent for phthalonitrile.Type: GrantFiled: September 9, 2004Date of Patent: January 29, 2008Assignee: BASF AktiengesellschaftInventors: Randolf Hugo, Kirsten Wenz, Sabine Jourdan, Thomas Preiss
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Publication number: 20070142673Abstract: A process for hydrogenating nitrile functions present in organic compounds over at least one heterogeneous catalyst, in which the hydrogenation is carried out in the presence of an ionic liquid, is described.Type: ApplicationFiled: December 20, 2004Publication date: June 21, 2007Applicant: BASF Aktiengesellschaft Patents, Trademarks and LicensesInventors: Verena Weiskopf, Till Gerlach, Kirsten Wenz
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Publication number: 20070088179Abstract: A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile, by contacting the vaporous product of the ammoxidation stage directly with a liquid organic solvent (quench), and hydrogenating the phthalonitrile in the resulting quench solution or suspension, wherein the organic solvent is N-methyl-2-pyrrolidone (NMP).Type: ApplicationFiled: August 27, 2004Publication date: April 19, 2007Applicant: BASF AktiengesellschaftInventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preiss, Alexander Weck
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Publication number: 20070088178Abstract: A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile by contacting the vaporous product of this ammoxidation stage directly with a liquid organic solvent (quench), removing products having a boiling point higher than phthalonitrile (high boilers) from the resulting quench solution or suspension and hydrogenating the phthalonitrile, wherein the organic solvent used for the quench is N-methyl-2-pyrrolidone (NMP), after the removal of the high boilers and before the hydrogenation, there is a partial or complete removal of the NMP and/or of products having a boiling point lower than phthalonitrile (low boilers) and the phthalonitrile for the hydrogenation step is dissolved or suspended in an organic solvent or in liquid ammonType: ApplicationFiled: September 4, 2004Publication date: April 19, 2007Applicant: BASF AktiengesellschaftInventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preiss, Alexander Weck
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Publication number: 20070027345Abstract: A process for preparing xylylenediamine by continuously hydrogenating liquid phthalonitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, in which a portion of the reactor effluent is recycled as a liquid circulation stream continuously to the reactor inlet (circulation mode), in which a stream of a phthalonitrile melt in liquid form is conducted by means of a mixer unit into the circulation stream around the hydrogenation reactor, the phthalonitrile conversion in the reactor on single pass being greater than 99%, and the circulation stream consisting to an extent of greater than 93% by weight of liquid ammonia and xylylenediamine and not comprising any further solvent for phthalonitrile.Type: ApplicationFiled: September 9, 2004Publication date: February 1, 2007Applicant: BASF AktiengesellschaftInventors: Randolf Hugo, Kirsten Wenz, Sabine Jourdan, Thomas Preiss
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Publication number: 20070010693Abstract: A process for preparing xylylenediamine, comprising the steps of ammoxidizing xylene to phthalonitrile and hydrogenating the phthalonitrile, which comprises contacting the vaporous product of the ammoxidation stage directly with a liquid organic solvent or with molten phthalonitrile (quench), partly or fully removing components having a boiling point lower than phthalonitrile (low boilers) from the resulting quench solution or suspension or phthalonitrile melt and, after the low boiler removal and before the hydrogenation, removing products having a boiling point higher than phthalonitrile (high boilers).Type: ApplicationFiled: September 4, 2004Publication date: January 11, 2007Applicant: BASF AktiengesellschaftInventors: Randolf Hugo, Sabine Jourdan, Kirsten Wenz, Thomas Preiss, Alexander Weck
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Publication number: 20060258889Abstract: A process for preparing xylylenediamine by continuously hydrogenating liquid phthalonitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, which comprises mixing a stream of a phthalonitrile melt in liquid form by means of a mixer unit with a stream of liquid ammonia and conducting the liquid mixture into the hydrogenation reactor.Type: ApplicationFiled: September 9, 2004Publication date: November 16, 2006Applicant: BASF AktiengesellschaftInventors: Randolf Hugo, Kirsten Wenz, Rolf Wambsganss, Sabine Jourdan, Thomas Preiss