Patents by Inventor Stefan Maixner
Stefan Maixner 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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Publication number: 20230312462Abstract: The invention relates to a process for producing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, comprising: (a) mixing an amine comprising feed stream, a phosgene comprising feed stream and optionally an inert solvent; (b) reacting the amine with phosgene in a first reaction section to obtain an intermediate reaction mixture comprising isocyanate, carbamoyl chlorides, amine hydrochlorides and unreacted phosgene; (c) cleaving the carbamoyl chlorides and remove phosgene from the intermediate reaction mixture in a second reaction section to obtain an isocyanate comprising crude product, (d) optionally working-up the crude product; wherein reacting (b) is carried out such that the intermediate reaction mixture comprises 1.7 to 5 mol-% solid amine hydrochlorides based on the molar amount of amine fed into the process.Type: ApplicationFiled: August 23, 2021Publication date: October 5, 2023Inventors: Jan Pablo JOSCH, Matthias HINRICHS, Jens FERBITZ, Kai THIELE, Torsten MATTKE, Stefan MAIXNER
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Publication number: 20230131205Abstract: A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula AxBy wherein: A is one or more element selected from Ni, Ru, Rh, Pd, Ir, Pt and Ag, B is one or more element selected from Sn, Sb, Pb, Zn, Ga, In, Ge and As, x is in the range 0.1-10, y in is in the range 0.1-10.Type: ApplicationFiled: November 3, 2022Publication date: April 27, 2023Inventors: Sven TITLBACH, Andreas KUSCHEL, Carlos LIZANDARA, Stephan A. SCHUNK, Joerg ROTHER, Juergen BECHTEL, Nedko Stefanov DREBOV, Stefan MAIXNER, Matthias HINRICHS, Mohamed HALABI, Imke Britta MUELLER, Michaela FENYN
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Patent number: 11512046Abstract: A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula AxBy wherein: A is one or more element selected from Ni, Ru, Rh, Pd, Ir, Pt and Ag, B is one or more element selected from Sn, Sb, Pb, Zn, Ga, In, Ge and As, x is in the range 0.1-10, y in is in the range 0.1-10.Type: GrantFiled: April 4, 2018Date of Patent: November 29, 2022Inventors: Sven Titlbach, Andreas Kuschel, Carlos Lizandara, Stephan A Schunk, Joerg Rother, Juergen Bechtel, Nedko Stefanov Drebov, Stefan Maixner, Matthias Hinrichs, Mohamed Halabi, Imke Britta Mueller, Michaela Fenyn
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Publication number: 20210002210Abstract: A process for preparing an aromatic isocyanate by direct carbonylation of a nitro aromatic compound by reacting the nitro aromatic compound with carbon monoxide in the presence of a catalyst, characterized in that the catalyst contains a multi metallic material comprising one or more binary intermetallic phases of the general formula AxBy wherein: A is one or more element selected from Ni, Ru, Rh, Pd, Ir, Pt and Ag, B is one or more element selected from Sn, Sb, Pb, Zn, Ga, In, Ge and As, x is in the range 0.1-10, y in is in the range 0.1-10.Type: ApplicationFiled: April 4, 2018Publication date: January 7, 2021Applicant: BASF SEInventors: Sven TITLBACH, Andreas KUSCHEL, Carlos LIZANDARA, Stephan A. SCHUNK, Joerg ROTHER, Juergen BECHTEL, Nedko Stefanov DREBOV, Stefan MAIXNER, Matthias HINRICHS, Mohamed HALABI, Imke Britta MUELLER, Michaela FENYN
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Patent number: 10435354Abstract: The invention relates to a process for preparing isocyanates by reacting primary amines with phosgene in a solvent, where the solvent comprises a dialkyl carbonate.Type: GrantFiled: August 7, 2018Date of Patent: October 8, 2019Assignee: BASF SEInventors: Manfred Heilig, Thomas Schulz, Torsten Mattke, Filip Nevejans, Kai Thiele, Stefan Maixner
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Publication number: 20180346414Abstract: The invention relates to a process for preparing isocyanates by reacting primary amines with phosgene in a solvent, where the solvent comprises a dialkyl carbonate.Type: ApplicationFiled: August 7, 2018Publication date: December 6, 2018Applicant: BASF SEInventors: Manfred HEILIG, Thomas SCHULZ, Torsten MATTKE, Filip NEVEJANS, Kai THIELE, Stefan MAIXNER
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Patent number: 10093615Abstract: The invention relates to a process for preparing isocyanates by reacting primary amines with phosgene in a solvent, where the solvent comprises a dialkyl carbonate.Type: GrantFiled: April 21, 2015Date of Patent: October 9, 2018Assignee: BASF SEInventors: Manfred Heilig, Thomas Schulz, Torsten Mattke, Filip Nevejans, Kai Thiele, Stefan Maixner
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Patent number: 8829232Abstract: The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, if appropriate in the presence of at least one inert medium, in which the amine and the phosgene are first mixed in a mixing chamber (1) to give a reaction mixture and the reaction mixture is fed to a reactor, the amine being added through an orifice (3) arranged coaxially to the mixing chamber (1) and the phosgene being added through feed orifices (5) in at least two planes (7, 9) arranged at right angles to the axis (11) of the mixing chamber (1), or the phosgene being added through the orifice (3) arranged coaxially to the mixing chamber and the amine through the feed orifices (5) in at least two planes (7, 9) arranged at right angles to the axis (11) of the mixing chamber (1). At least one plane (9) is arranged upstream and at least one plane (7) downstream of the orifice (3) arranged coaxially to the mixing chamber (1) in main flow direction of the reaction mixture.Type: GrantFiled: August 6, 2009Date of Patent: September 9, 2014Assignee: BASF SEInventors: Ulrich Penzel, Torsten Mattke, Andreas Wölfert, Johannes Jacobs, Tsung-Chieh Cheng, Kerstin Heinen, Eckhard Stroefer, Stefan Maixner, Wolfgang Mackenroth, Christian Tragut, Kai Thiele, Myung Un Won
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Patent number: 8772535Abstract: Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel.Type: GrantFiled: April 9, 2012Date of Patent: July 8, 2014Assignee: BASF SEInventors: Ralf Boehling, Sven Kueber, Stefan Maixner, Eckhard Stroefer, Jochem Henkelmann, Georg Krug, Werner Bolz
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Patent number: 8614356Abstract: A process for preparing tolylenediamine by hydrogenating dinitrotoluene with hydrogen in the presence of a suspended catalyst in a vertically upright reactor (1), at the upper end of which is arranged a motive jet nozzle (2) through which the reaction mixture drawn off from the reactor bottom, via an external loop, is sprayed into the upper region of the reactor (1) and then flows into a central inserted tube (4) which is arranged in the longitudinal direction of the reactor, flows through the latter from the top downward and flows upward again outside the inserted tube (4) in an internal loop motion, with a heat exchanger (6) in the interior of the reactor (1), through which cooling water flows, and absorbs some of the heat of reaction as it does so, with a feed for the dinitrotoluene at the upper end of the reactor (1) and a feed for the hydrogen at the lower end of the reactor (1), and wherein, in addition to the heat exchanger (6) arranged in the interior of the reactor (1), a further heat exchanger (WType: GrantFiled: December 21, 2009Date of Patent: December 24, 2013Assignee: BASF SEInventors: Joana Coelho Tsou, Steffen Oehlenschlaeger, Ekkehard Schwab, Wolfgang Mackenroth, Hartwig Voss, Stefan Maixner, Samuel Neto, Sven Boehmeke, Frederik Van Laar
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Publication number: 20120197038Abstract: Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel.Type: ApplicationFiled: April 9, 2012Publication date: August 2, 2012Applicant: BASF SEInventors: Ralf Böhling, Sven Küber, Stefan Maixner, Eckhard Stroefer, Jochem Henkelmann, Georg Krug, Werner Bolz
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Patent number: 8212069Abstract: Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel.Type: GrantFiled: October 18, 2007Date of Patent: July 3, 2012Inventors: Ralf Boehling, Sven Kueber, Stefan Maixner, Eckhard Stroefer, Jochem Henkelmann, Georg Krug, Werner Bolz
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Publication number: 20110275858Abstract: A process for preparing tolylenediamine by hydrogenating dinitrotoluene with hydrogen in the presence of a suspended catalyst in a vertically upright reactor (1), at the upper end of which is arranged a motive jet nozzle (2) through which the reaction mixture drawn off from the reactor bottom, via an external loop, is sprayed into the upper region of the reactor (1) and then flows into a central inserted tube (4) which is arranged in the longitudinal direction of the reactor, flows through the latter from the top downward and flows upward again outside the inserted tube (4) in an internal loop motion, with a heat exchanger (6) in the interior of the reactor (1), through which cooling water flows, and absorbs some of the heat of reaction as it does so, with a feed for the dinitrotoluene at the upper end of the reactor (1) and a feed for the hydrogen at the lower end of the reactor (1), and wherein, in addition to the heat exchanger (6) arranged in the interior of the reactor (1), a further heat exchanger (WType: ApplicationFiled: December 21, 2009Publication date: November 10, 2011Applicant: BASF SEInventors: Joana Coelho Tsou, Steffen Oehlenschlaeger, Ekkehard Schwab, Wolfgang Mackenroth, Hartwig Voss, Stefan Maixner, Samuel Neto, Sven Boehmeke, Frederik van Laar
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Publication number: 20110251425Abstract: The invention relates to a process for preparing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, if appropriate in the presence of at least one inert medium, in which the amine and the phosgene are first mixed in a mixing chamber (1) to give a reaction mixture and the reaction mixture is fed to a reactor, the amine being added through an orifice (3) arranged coaxially to the mixing chamber (1) and the phosgene being added through feed orifices (5) in at least two planes (7, 9) arranged at right angles to the axis (11) of the mixing chamber (1), or the phosgene being added through the orifice (3) arranged coaxially to the mixing chamber and the amine through the feed orifices (5) in at least two planes (7, 9) arranged at right angles to the axis (11) of the mixing chamber (1). At least one plane (9) is arranged upstream and at least one plane (7) downstream of the orifice (3) arranged coaxially to the mixing chamber (1) in main flow direction of the reaction mixture.Type: ApplicationFiled: August 6, 2009Publication date: October 13, 2011Applicant: BASF SEInventors: Ulrich Penzel, Torsten Mattke, Andreas Wolfert, Johannes Jocobs, Tsung-Chieh Cheng, Kerstin Heinen, Eckhard Stroefer, Stefan Maixner, Wolfgang Mackenroth, Christian Tragut, Kai Thiele, Myung Un Won
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Patent number: 7875740Abstract: The iron-containing catalyst suitable for use as a catalyst contains a) iron or a mixture containing iron and an iron-based compound. The iron has an average crystallite size ranging from 1-35 nm measured by X-ray diffraction.Type: GrantFiled: October 18, 2002Date of Patent: January 25, 2011Assignee: BASF AktiengesellschaftInventors: Andreas Ansmann, Christoph Benisch, Peter Baβler, Rolf-Hartmuth Fischer, Stefan Maixner, Johann-Peter Melder, Hermann Luyken
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Publication number: 20100317889Abstract: Process for preparing isocyanates by phosgenation of amines, wherein phosgene and amine are brought into contact in at least 2 mixing chambers connected in parallel.Type: ApplicationFiled: October 18, 2007Publication date: December 16, 2010Applicant: BASF SEInventors: Ralf Boehling, Sven Kueber, Stefan Maixner, Eckhard Stroefer, Jochem Henkelmann, Georg Krug, Werner Bolz
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Patent number: 7501047Abstract: The disclosure relates to a process for purifying crude caprolactam. The process involves converting a first mixture of 6-amino capronitrile and water to a second mixture of caprolactam ammonia, water, high boilers and low boilers using a catalyst. The ammonia is removed from the second mixture to obtain a third mixture. Water is removed from the third mixture to give crude caprolactam, high boiler and low boilers. Purified caprolactam is then obtained by a series of distillation steps.Type: GrantFiled: November 11, 2003Date of Patent: March 10, 2009Assignee: BASF AktiengesellschaftInventors: Hermann Luyken, Andreas Ansmann, Christoph Benisch, Peter Baβler, Rolf-Hartmuth Fischer, Stefan Maixner, Johann-Peter Melder
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Patent number: 7385073Abstract: A process for reducing the level of an aliphatic monounsaturated amine (IV) in a mixture (V) containing an aminonitrile (I) or a diamine (II) or a dinitrile (III) or mixtures thereof as well as said mine (IV) by a) reacting said mixture (V) with an anionic nucleophile (VI) which contains a nucleophilic atom selected from the group consisting of oxygen, nitrogen and sulfur, which is capable of taking up an H+ ion to form an acid having a pKa value in the range from 7 to 11, as measured in water at 25° C., and which has a relative nucleophilicity, as measured in methyl perchlorate/methanol at 25° C., in the range from 3.4 to 4.7 when said nucleophilic atom is oxygen, in the range from 4.5 to 5.8 when said nucleophilic atom is nitrogen, and in the range from 5.5 to 6.8 when said nucleophilic atom is sulfur, in an amount in the range from 0.01 to 10 mol per mole of said amine (IV) in said mixture (V) at a temperature in the range from 50 to 200° C.Type: GrantFiled: May 21, 2003Date of Patent: June 10, 2008Assignee: BASF AktiengesellschaftInventors: Stefan Maixner, Christoph Benisch, Hermann Luyken, Peter Baβler, Rolf-Hartmuth Fischer, Johann-Peter Melder, Andreas Ansmann
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Patent number: 7342134Abstract: The invention relates to a process for distillatively preparing TDA from a reactant stream comprising TDA, high boilers and low boilers in a dividing wall column in which a dividing wall is disposed in the longitudinal direction of the column to form an upper combined column region (2), a lower combined column region (3), a feed section (4) having a rectifying section (5) and stripping section (6), and also a withdrawal section (7) having a rectifying section (9) and stripping section (8), which comprises the following steps: a. feeding the reactant stream (13) into the feed section (4) of the dividing wall column (1); b. drawing off a low boiler fraction via the top of the column (11); c. drawing off TDA via a side draw (14) in the withdrawal section (7) of the dividing wall column (1); d. drawing off a low boiler fraction via the bottom of the column (12).Type: GrantFiled: January 7, 2005Date of Patent: March 11, 2008Assignee: BASF AktiengesellschaftInventors: Carsten Knoesche, Martin Sohn, Ulrich Penzel, Hans-Juergen Pallasch, Gunter Georgi, Wolfgang Mackenroth, Hans Volkmar Schwarz, Stefan Maixner, Gerald Molz, Eckhard Stroefer
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Patent number: 7217818Abstract: A process for removing high boilers from crude caprolactam which comprises high boilers, caprolactam and in some cases low boilers, and which has been obtained by a) reacting 6-aminocapronitrile with water to give a reaction mixture b) removing ammonia and unconverted water from the reaction mixture to obtain crude caprolactam, which comprises c) feeding the crude caprolactam to a distillation apparatus to obtain a first substream via the top as a product and a second substream via the bottom, by setting the pressure in the distillation in such a way that the bottom temperature does not go below 170° C., and adjusting the second substream in such a way that the caprolactam content of the second substream is not less than 10% by weight, based on the entire second substream.Type: GrantFiled: November 11, 2003Date of Patent: May 15, 2007Assignee: BASF AktiengesellschaftInventors: Rolf-Hartmuth Fischer, Hermann Luyken, Andreas Ansmann, Peter Bassler, Christoph Benisch, Stefan Maixner, Johann-Peter Melder