Patents by Inventor Michael Zöllinger
Michael Zöllinger 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: 11339492Abstract: The present invention relates to a method for the galvanic deposition of zinc and zinc alloy coatings from an alkaline coating bath with a reduced degradation of organic bath additives. An electrode that contains metallic manganese and/or manganese oxide and is insoluble in the bath is hereby used as an anode. The electrode is produced from metallic manganese or an alloy comprising at least 5% by weight of manganese, or from an electrically conductive substrate and a metallic manganese and/or manganese oxide-containing coating applied thereto, or from a composite material, wherein the coating and the composite material comprise at least 5% by weight of manganese. The method according to the invention is particularly suitable for the galvanic deposition of zinc-nickel alloy coatings from alkaline zinc-nickel baths since the formation of cyanides can be very effectively inhibited.Type: GrantFiled: February 5, 2018Date of Patent: May 24, 2022Assignee: Dr.-Ing. Max Schlötter GmbH & Co. KGInventors: Volker Wohlfarth, Ralph Krauss, Michael Zöllinger
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Publication number: 20190376200Abstract: The present invention relates to a method for the galvanic deposition of zinc and zinc alloy coatings from an alkaline coating bath with a reduced degradation of organic bath additives. An electrode that contains metallic manganese and/or manganese oxide and is insoluble in the bath is hereby used as the anode, and is produced from metallic manganese or a manganese-containing alloy, the manganese-containing alloy comprising at least 5% by weight of manganese, or is produced from an electrically conductive substrate and a metallic manganese and/or manganese oxide-containing coating applied thereto, or is produced from a composite material, with both the metallic manganese and/or manganese oxide-containing coating and the composite material comprising at least 5% by weight of manganese, based on the total amount of manganese resulting from metallic manganese and manganese oxide.Type: ApplicationFiled: February 5, 2018Publication date: December 12, 2019Applicant: Dr.-Ing. Max Schlötter GmbH & Co. KGInventors: Volker Wohlfarth, Ralph Krauss, Michael Zöllinger
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Patent number: 9630866Abstract: The present invention relates to a process for workup of nitrite-comprising alkaline process wastewaters from the nitration of aromatic compounds, wherein the alkaline process wastewater is acidified by addition of acids and the offgas which comprises nitrogen oxides and escapes from the acidified process wastewater is worked up, comprising the steps of a) acidifying the process wastewater by adding acid to a pH below 5, which forms an organic phase which separates out, an acidic aqueous phase and a gaseous NOx-containing phase, and b) removing the gaseous NOx-containing phase.Type: GrantFiled: December 13, 2010Date of Patent: April 25, 2017Assignee: BASF SEInventors: Ruediger Fritz, Renate Hempel, Michael Zoellinger, Holger Allardt, Reiner Reetz
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Patent number: 8981155Abstract: A process for preparing aromatic amines by hydrogenation of nitroaromatics in the presence of catalysts, forming a fluid, amine-comprising reaction mixture in a reactor, wherein chromatographic analysis of the reaction mixture is carried out to determine the concentration of nitro and nitroso compounds in the reaction mixture.Type: GrantFiled: December 5, 2011Date of Patent: March 17, 2015Assignee: BASF SEInventors: Stefanie Haase, Dusko Kadijevic, Anne-Kathrin Merten, Michael Zoellinger, Andreas Raichle, Alexander Schocker, Sandra Mühlbeyer, Olaf Wiedenhoff, Joana Coelho Tsou
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Patent number: 8853443Abstract: The present invention relates to a process for preparing an isocyanate, comprising hydrogenating a mixture (Gi) comprising an amine in the presence of a hydrogenation catalyst comprising copper to obtain a mixture (Gii) comprising the amine, and reacting the mixture (Gii) with phosgene to obtain a mixture (Giii) comprising the isocyanate. The present invention further relates to the isocyanate preparable by this process.Type: GrantFiled: November 18, 2009Date of Patent: October 7, 2014Assignee: BASF SEInventors: Daniel Breuninger, Johannes Adam, Heiner Schelling, Eckhard Stroefer, Markus Kraemer, Matthias Eiermann, Kai Thiele, Michael Zoellinger, Rolf Pinkos
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Patent number: 8710267Abstract: The invention relates to a process for preparing methylenediphenyldiamine (MDA), comprising the following steps a) to c): a) converting formaldehyde and aniline to aminal b) removing water from the aminal obtained in step a) to establish a water content of 0 to 5% by weight based on the aminal, and c) adding an acidic catalyst to the aminal having a water content of 0 to 5% by weight, which comprises using formaldehyde in step a) in the form of highly concentrated formaldehyde with a CH2O content of >50% by weight and preparing the formaldehyde by oxidative dehydrogenation from methanol.Type: GrantFiled: April 19, 2010Date of Patent: April 29, 2014Assignee: BASF SEInventors: Eckhard Stroefer, Kai Thiele, Michael Zoellinger, Johnny Moors, Jon S. Speier
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Patent number: 8637712Abstract: Precipitations of nitrohydroxyaromatic salts out of the nitrated crude products obtained in the nitration of aromatic compounds after alkaline scrubbing, for example mononitrotoluenes, are prevented by contacting the nitrated crude products with an acidic ion exchanger. The nitrated crude products are preferably selected from a feedstream to a distillation column, a bottoms circulation stream of a distillation column and a feedstream to a vaporizer.Type: GrantFiled: January 31, 2012Date of Patent: January 28, 2014Assignee: BASF SEInventors: Holger Allardt, Andreas Raichle, Reiner Reetz, Johannes Büttner, Michael Zöllinger, Stefanie Haase, Rüdiger Fritz
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Patent number: 8614352Abstract: The invention relates to a process for preparing methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is <10 000 ppm, based on all compounds present in the process. The invention further relates to the phosgenation of MDA to methylenediphenyl diisocyanate (MDI).Type: GrantFiled: April 20, 2010Date of Patent: December 24, 2013Assignee: BASF SEInventors: Eckhard Stroefer, Heiner Schelling, Robert Reinhardt, Michael Zoellinger, Daniel Breuninger, Markus Kraemer, Kai Thiele, Peter Van Den Abeel
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Patent number: 8609899Abstract: The invention relates to a process for the continuous preparation of toluenediamine by liquid-phase hydrogenation of dinitrotoluene by means of hydrogen in the presence of a suspended, nickel-comprising catalyst in a reactor with a product isolation unit downstream of the reactor to give a product output from the reactor comprising a liquid phase comprising toluenediamine and dinitrotoluene, in which the nickel-comprising catalyst is suspended, wherein the concentration of dinitrotoluene in the liquid phase of the product output from the reactor in the region between the reactor and the downstream product isolation unit is set to a value in the range from 1 to 200 ppm by weight, based on the total weight of the liquid phase of the product output from the reactor.Type: GrantFiled: May 17, 2011Date of Patent: December 17, 2013Assignee: BASF SEInventors: Andreas Raichle, Joana Coelho Tsou, Samuel Neto, Ulrich Penzel, Steffen Oehlenschlaeger, Michael Zoellinger, Holgar Braunsberg, Stefanie Haase, Johannes Buettner
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Patent number: 8529771Abstract: A process for working up alkaline process wastewater from the nitration of aromatic compounds to mono-, di- and trinitroaromatics, said alkaline process wastewater having a pH of 7.5 to 13, comprising the steps of a) acidifying the alkaline process wastewater by adding concentrated sulfuric acid which originates from the workup of the aqueous, sulfuric acid-containing phase obtained in the nitration to a pH below 5, which forms a mixture A consisting of organic phase which separates out and acidic aqueous phase, b) contacting the mixture A with fresh sewage sludge, and c) removing the sewage sludge.Type: GrantFiled: December 13, 2010Date of Patent: September 10, 2013Assignee: BASF SEInventors: Ruediger Fritz, Renate Hempel, Michael Zoellinger, Anne-Kathrin Merten, Doris Zschieschang, Ina Homann, Annett Gersdorf, Holger Allardt, Reiner Reetz, Elvira Flegel
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Publication number: 20120248038Abstract: A process for working up alkaline process wastewater from the nitration of aromatic compounds to mono-, di- and trinitroaromatics with a pH of 7.5 to 13 or a mixture W with a pH of 6 to 10 of alkaline process wastewater and the aqueous distillate of the sulfuric acid concentration, comprising the steps of a) acidifying the alkaline process wastewater or the mixture W by adding concentrated sulfuric acid which originates from the workup of the aqueous, sulfuric acid-containing phase obtained in the nitration to a pH below 2, which forms a mixture A consisting of organic phase which separates out and acidic aqueous phase, and b) extracting the mixture A with an aromatic extractant.Type: ApplicationFiled: December 13, 2010Publication date: October 4, 2012Applicant: BASF SEInventors: Ruediger Fritz, Renate Hempel, Baerbel Guschel, Helmut Richter, Anne-Kathrin Merten, Michael Zoellinger, Elvira Flegel, Holger Allardt, Reiner Reetz
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Publication number: 20120234773Abstract: A process for working up alkaline process wastewater from the nitration of aromatic compounds to mono-, di- and trinitroaromatics, said alkaline process wastewater having a pH of 7.5 to 13, comprising the steps of a) acidifying the alkaline process wastewater by adding concentrated sulfuric acid which originates from the workup of the aqueous, sulfuric acid-containing phase obtained in the nitration to a pH below 5, which forms a mixture A consisting of organic phase which separates out and acidic aqueous phase, b) contacting the mixture A with fresh sewage sludge, and c) removing the sewage sludge.Type: ApplicationFiled: December 13, 2010Publication date: September 20, 2012Applicant: BASF SEInventors: Ruediger Fritz, Renate Hempel, Michael Zoellinger, Anne-Kathrin Merten, Doris Zschieschang, Ina Homann, Annett Gersdorf, Holger Allardt, Reiner Reetz, Elvira Flegel
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Publication number: 20120228218Abstract: The present invention relates to a process for workup of nitrite-comprising alkaline process wastewaters from the nitration of aromatic compounds, wherein the alkaline process wastewater is acidified by addition of acids and the offgas which comprises nitrogen oxides and escapes from the acidified process wastewater is worked up, comprising the steps of a) acidifying the process wastewater by adding acid to a pH below 5, which forms an organic phase which separates out, an acidic aqueous phase and a gaseous NOx-containing phase, and b) removing the gaseous NOx-containing phase.Type: ApplicationFiled: December 13, 2010Publication date: September 13, 2012Applicant: BASF SEInventors: Ruediger Fritz, Renate Hempel, Michael Zoellinger, Holger Allardt, Reiner Reetz
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Publication number: 20120215029Abstract: A process for preparing aromatic amines by hydrogenation of nitroaromatics in the presence of catalysts, forming a fluid, amine-comprising reaction mixture in a reactor, wherein chromatographic analysis of the reaction mixture is carried out to determine the concentration of nitro and nitroso compounds in the reaction mixture.Type: ApplicationFiled: December 5, 2011Publication date: August 23, 2012Applicant: BASF SEInventors: Stefanie Haase, Dusko Kadijevic, Anne-Kathrin Merten, Michael Zoellinger, Andreas Raichle, Alexander Schocker, Sandra Mühlbeyer, Olaf Wiedenhoff, Joana Coelho Tsou
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Publication number: 20120197047Abstract: Precipitations of nitrohydroxyaromatic salts out of the nitrated crude products obtained in the nitration of aromatic compounds after alkaline scrubbing, for example mononitrotoluenes, are prevented by contacting the nitrated crude products with an acidic ion exchanger. The nitrated crude products are preferably selected from a feedstream to a distillation column, a bottoms circulation stream of a distillation column and a feedstream to a vaporizer.Type: ApplicationFiled: January 31, 2012Publication date: August 2, 2012Applicant: BASF SEInventors: Holger ALLARDT, Andreas RAICHLE, Reiner REETZ, Johannes BÜTTNER, Michael ZÖLLINGER, Stefanie HAASE, Rüdiger FRITZ
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Publication number: 20120046497Abstract: The invention relates to a process for preparing methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is <10 000 ppm, based on all compounds present in the process. The invention further relates to the phosgenation of MDA to methylenediphenyl diisocyanate (MDI).Type: ApplicationFiled: April 20, 2010Publication date: February 23, 2012Applicant: BASF SEInventors: Eckhard Stroefer, Heiner Schelling, Robert Reinhardt, Michael Zoellinger, Daniel Breuninger, Markus Kraemer, Kai Thiele, Peter Van Den Abeel
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Publication number: 20120035396Abstract: The invention relates to a process for preparing methylenediphenyldiamine (MDA), comprising the following steps a) to c): a) converting formaldehyde and aniline to aminal b) removing water from the aminal obtained in step a) to establish a water content of 0 to 5% by weight based on the aminal, and c) adding an acidic catalyst to the aminal having a water content of 0 to 5% by weight, which comprises using formaldehyde in step a) in the form of highly concentrated formaldehyde with a CH2O content of >50% by weight and preparing the formaldehyde by oxidative dehydrogenation from methanol.Type: ApplicationFiled: April 19, 2010Publication date: February 9, 2012Applicant: BASF SEInventors: Eckhard Stroefer, Kai Thiele, Michael Zoellinger, Johnny Moors, Jon S. Speier
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Publication number: 20110295039Abstract: The invention relates to a process for the continuous preparation of toluenediamine by liquid-phase hydrogenation of dinitrotoluene by means of hydrogen in the presence of a suspended, nickel-comprising catalyst in a reactor with a product isolation unit downstream of the reactor to give a product output from the reactor comprising a liquid phase comprising toluenediamine and dinitrotoluene, in which the nickel-comprising catalyst is suspended, wherein the concentration of dinitrotoluene in the liquid phase of the product output from the reactor in the region between the reactor and the downstream product isolation unit is set to a value in the range from 1 to 200 ppm by weight, based on the total weight of the liquid phase of the product output from the reactor.Type: ApplicationFiled: May 17, 2011Publication date: December 1, 2011Applicant: BASF SEInventors: Andreas Raichle, Joana Coelho Tsou, Samuel Neto, Ulrich Penzel, Steffen Oehlenschläger, Michael Zöllinger, Holgar Braunsberg, Stefanie Haase, Johannes Büttner
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Publication number: 20110284391Abstract: The invention relates to a process for the electrochemical treatment of aromatic nitro compounds, which comprises the steps: introducing an aqueous composition comprising at least one aromatic nitro compound into the anode space of an electrolysis cell and carrying out an electrolysis at an anodic current density in the range from 0.1 to 10 kA/m2 and a cell potential in the range from 4 to 15 V.Type: ApplicationFiled: May 19, 2011Publication date: November 24, 2011Applicants: Verein fuer Kernve. und Analyt. Rosse. e.V. (VKTA), BASF SEInventors: Rüdiger FRITZ, Stefanie Haase, Holger Allardt, Michael Zoellinger, Reiner Reetz, Hans-Juergen Friedrich
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Publication number: 20110263892Abstract: The present invention relates to a process for preparing an isocyanate, comprising hydrogenating a mixture (Gi) comprising an amine in the presence of a hydrogenation catalyst comprising copper to obtain a mixture (Gii) comprising the amine, and reacting the mixture (Gii) with phosgene to obtain a mixture (Giii) comprising the isocyanate. The present invention further relates to the isocyanate preparable by this process.Type: ApplicationFiled: November 18, 2009Publication date: October 27, 2011Applicant: BASF SEInventors: Daniel Breuninger, Johannes Adam, Heiner Schelling, Eckhard Stroefer, Markus Kraemer, Matthias Eiermann, Kai Thiele, Michael Zoellinger, Rolf Pinkos