Patents by Inventor Jurgen Munnig
Jurgen Munnig 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: 9896407Abstract: The invention relates to a method for producing dinitrotoluene, comprising the following steps: a) nitrating toluene with a mixture of nitric acid and sulfuric acid and subsequently separating a sulfuric-acid-containing aqueous phase that arises in the nitration, wherein a raw dinitrotoluene is obtained, b) washing the raw dinitrotoluene in a water wash with neutral and/or alkaline washing water, wherein a pre-cleaned dinitrotoluene, which contains at least water in addition to dinitrotoluene, is obtained after the washing water used in the last wash has been separated, and c) separating the water from the pre-cleaned dinitrotoluene, d) collecting the waste water from steps a), b), and/or c), e) optionally extracting the collected waste water from step d) with toluene and returning the thus obtained organic phase to step a), f) freeing the collected waste water from step d), or, if the optional step e) is performed, the extracted waste water from step e), of toluene in a toluene stripper, wherein a toluene-coType: GrantFiled: September 29, 2015Date of Patent: February 20, 2018Assignee: Covestro Deutschland AGInventors: Thomas Knauf, Jürgen Münnig, Wolfgang Lorenz, Bernd Pennemann
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Publication number: 20170291869Abstract: The invention relates to a method for producing dinitrotoluene, comprising the following steps: a) nitrating toluene with a mixture of nitric acid and sulfuric acid and subsequently separating a sulfuric-acid-containing aqueous phase that arises in the nitration, wherein a raw dinitrotoluene is obtained, b) washing the raw dinitrotoluene in a water wash with neutral and/or alkaline washing water, wherein a pre-cleaned dinitrotoluene, which contains at least water in addition to dinitrotoluene, is obtained after the washing water used in the last wash has been separated, and c) separating the water from the pre-cleaned dinitrotoluene, d) collecting the waste water from steps a), b), and/or c), e) optionally extracting the collected waste water from step d) with toluene and returning the thus obtained organic phase to step a), f) freeing the collected waste water from step d), or, if the optional step e) is performed, the extracted waste water from step e), of toluene in a toluene stripper, wherein a toluene-coType: ApplicationFiled: September 29, 2015Publication date: October 12, 2017Inventors: Thomas KNAUF, Jürgen MÜNNIG, Wolfgang LORENZ, Bernd PENNEMANN
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Patent number: 9227909Abstract: The present invention relates to a method for producing nitrobenzene, in which the waste gas streams accruing in the process and containing benzene and (traces of) nitrobenzene, possibly low- and medium-boiling components, possibly non-condensable gases and possibly water, optionally after removal of nitrogen oxides, are scrubbed in an absorption column with nitrobenzene, which comprises only very small amounts (maximum 50 ppm) of benzene and is distributed by means of a liquid distributor at a rate of 50 to 200 drip points per square meter, preferably 60 to 120 drip points per square meter, wherein (i) a liquid stream containing benzene and nitrobenzene, possibly organic low- and medium-boiling components and additionally containing sulfuric acid if sulfuric acid is used as the scrubbing agent and (ii) waste gas depleted in benzene and possibly in organic low- and medium-boiling components are obtained.Type: GrantFiled: October 4, 2013Date of Patent: January 5, 2016Assignee: Covestro Deutschland AGInventors: Thomas Knauf, Jurgen Munnig, Joerg Schmiedler
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Publication number: 20150336875Abstract: The present invention relates to a method for producing nitrobenzene, in which the waste gas streams accruing in the process and containing benzene and (traces of) nitrobenzene, possibly low- and medium-boiling components, possibly non-condensable gases and possibly water, optionally after removal of nitrogen oxides, are scrubbed in an absorption column with nitrobenzene, which comprises only very small amounts (maximum 50 ppm) of benzene and is distributed by means of a liquid distributor at a rate of 50 to 200 drip points per square metre, preferably 60 to 120 drip points per square metre, wherein (i) a liquid stream containing benzene and nitrobenzene, possibly organic low- and medium-boiling components and additionally containing sulfuric acid if sulfuric acid is used as the scrubbing agent and (ii) waste gas depleted in benzene and possibly in organic low- and medium-boiling components are obtained.Type: ApplicationFiled: October 4, 2013Publication date: November 26, 2015Inventors: Thomas Knauf, Jurgen Munnig, Joerg Schmiedler
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Publication number: 20150099906Abstract: The present invention relates to a method for producing nitrobenzene, in which the waste gas streams accruing in the process and containing benzene and (traces of) nitrobenzene, possibly low- and medium-boiling components, possibly non-condensable gases and possibly water, optionally after removal of nitrogen oxides, are scrubbed in an absorption column with nitrobenzene, which comprises only very small amounts (maximum 50 ppm) of benzene and is distributed by means of a liquid distributor at a rate of 50 to 200 drip points per square metre, preferably 60 to 120 drip points per square metre, wherein (i) a liquid stream containing benzene and nitrobenzene, possibly organic low- and medium-boiling components and additionally containing sulfuric acid if sulfuric acid is used as the scrubbing agent and (ii) waste gas depleted in benzene and possibly in organic low- and medium-boiling components are obtained.Type: ApplicationFiled: October 4, 2013Publication date: April 9, 2015Inventors: Thomas Knauf, Jurgen Munnig, Joerg Schmiedler
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Publication number: 20130204043Abstract: The present invention relates to a continuous process for the production of nitrobenzene by nitration of benzene with nitric acid or mixtures of nitric acid and sulfuric acid to give a crude nitrobenzene, washing of the crude nitrobenzene by means of at least one of each of an acid, alkaline and neutral washing, there being obtained a pre-purified nitrobenzene which, as well as containing nitrobenzene, at least contains also low boilers, optionally middle boilers as well as high boilers and salts, wherein the pre-purified nitrobenzene is purified further by separating off low boilers in a distillation apparatus by evaporation of the low boilers, and separation of nitrobenzene from the resulting further purified nitrobenzene in a distillation apparatus by partial evaporation of nitrobenzene, wherein pure nitrobenzene is removed from the distillation apparatus in gaseous form and is subsequently condensed, and wherein the non-evaporated portion of the further purified nitrobenzene is fed back into the washing aType: ApplicationFiled: July 26, 2011Publication date: August 8, 2013Applicant: Bayer Intellectual Property GmbH Creative Campus MonheimInventors: Thomas Knauf, Michael Merkel, Andreas Karl Rausch, Peter Lehner, Jürgen Münnig
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Patent number: 8357827Abstract: Nitrobenzene is continuously produced by nitration of benzene with mixed acid under adiabatic conditions. In this process, the pressure upstream of the nitration reactor is from 14 bar to 40 bar above the pressure in the gas phase of the phase separation apparatus used to separate crude nitrobenzene and waste acid.Type: GrantFiled: February 2, 2011Date of Patent: January 22, 2013Assignee: Bayer MaterialScience AGInventors: Jurgen Munnig, Bernd Pennemann, Andreas Karl Rausch
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Publication number: 20110196177Abstract: Nitrobenzene is continuously produced by nitration of benzene with mixed acid under adiabatic conditions. In this process, the pressure upstream of the nitration reactor is from 14 bar to 40 bar above the pressure in the gas phase of the phase separation apparatus used to separate crude nitrobenzene and waste acid.Type: ApplicationFiled: February 2, 2011Publication date: August 11, 2011Applicant: Bayer MaterialScience AGInventors: Jürgen MÜNNIG, Bernd PENNEMANN, Andreas Karl RAUSCH
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Patent number: 7442835Abstract: The invention relates to a process for the production of phosgene, in which chlorine and carbon monoxide are reacted in the presence of an activated charcoal catalyst in a shell-and-tube reactor which contains a plurality of reaction tubes and a coolant space surrounding the reaction tubes, in which a) cooling of the reaction tubes is from the outside through the coolant space with water by evaporative cooling, and b) operation of the reaction tubes is at a pressure above the pressure in the coolant space.Type: GrantFiled: August 25, 2005Date of Patent: October 28, 2008Assignee: Bayer MaterialScience AGInventors: Berthold Keggenhoff, Heinrich Lokum, Jürgen Münnig
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Patent number: 7322565Abstract: The invention describes a stirring device made from a gassing stirrer and a liquid mixer or two liquid mixers, which are arranged on a shaft and each have a feed and at least one exit opening, wherein the exit openings of the gassing stirrer and of the liquid mixer or the liquid mixers are at a distance from one another, the ratio, a/d, of the distance, a, between the exit openings to the diameter, d, of the gassing stirrer or liquid mixer being 0.02 to 0.5 and the ratio, b/d, of the distance, b, between the outer edges to the diameter, d, of the gassing stirrer or liquid mixer being 0.01 to 0.4.Type: GrantFiled: August 9, 2005Date of Patent: January 29, 2008Assignee: Bayer MaterialScience AGInventors: Rainer Buse, Berthold Keggenhoff, Jürgen Münnig, Friedhelm Steffens, Joachim Ritter
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Publication number: 20060047170Abstract: The invention relates to a process for the production of phosgene, in which chlorine and carbon monoxide are reacted in the presence of an activated charcoal catalyst in a shell-and-tube reactor which contains a plurality of reaction tubes and a coolant space surrounding the reaction tubes, in which a) cooling of the reaction tubes is from the outside through the coolant space with water by evaporative cooling, and b) operation of the reaction tubes is at a pressure above the pressure in the coolant space.Type: ApplicationFiled: August 25, 2005Publication date: March 2, 2006Inventors: Berthold Keggenhoff, Heinrich Lokum, Jurgen Munnig
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Publication number: 20060038306Abstract: The invention describes a stirring device made from a gassing stirrer and a liquid mixer or two liquid mixers, which are arranged on a shaft and each have a feed and at least one exit opening, wherein the exit openings of the gassing stirrer and of the liquid mixer or the liquid mixers are at a distance from one another, the ratio, a/d, of the distance, a, between the exit openings to the diameter, d, of the gassing stirrer or liquid mixer being 0.02 to 0.5 and the ratio, b/d, of the distance, b, between the outer edges to the diameter, d, of the gassing stirrer or liquid mixer being 0.01 to 0.4.Type: ApplicationFiled: August 9, 2005Publication date: February 23, 2006Inventors: Rainer Buse, Berthold Keggenhoff, Jurgen Munnig, Friedhelm Steffens, Joachim Ritter
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Patent number: 6984762Abstract: The invention relates to a process for the production of dinitrotoluene by the two-stage nitration of toluene. In the first stage of this process, toluene was reacted adiabatically with nitrating acid so that at least 90% of the toluene was reacted off and no more than 70% of the toluene formed dinitrotoluene. The resulting organic phase containing mononitrotoluene and the aqueous acid phase containing sulfuric acid were separated, and the aqueous acid phase containing sulfuric acid was concentrated by flash evaporation. The resulting concentrated sulfuric acid was recycled into the reaction in the first stage, and/or into the reaction in the second stage, and/or into the concentration in the second stage. In the second stage, the organic phase containing mononitrotoluene from the first stage was completely reacted isothermally with nitrating acid.Type: GrantFiled: February 17, 2004Date of Patent: January 10, 2006Assignee: Bayer AktiengesellschaftInventors: Erwin Dieterich, Anke Hielscher, Berthold Keggenhoff, Manfred Keller-Killewald, Jürgen Münnig, Dietmar Wastian
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Patent number: 6953869Abstract: The present invention relates to a process for working up organic secondary components which are formed in the one-stage or two-stage nitration of toluene to dinitrotoluene. These organic secondary components are present in the acidic and alkaline waste water from the dinitrotoluene washing step and in the aqueous distillate from the sulfuric acid concentration step, together with small amounts of mononitrotoluene and dinitrotoluene. This process comprises a) combining the acidic and alkaline waste waters from the washing step and the aqueous distillate from the sulfuric acid concentration step such that the resulting mixture has a pH below 5, b) separating the aqueous and organic phases which form by phase separation, and c) recycling the organic phase from step b) into the nitration process.Type: GrantFiled: June 28, 2004Date of Patent: October 11, 2005Assignee: Bayer MaterialScience AGInventors: Jürgen Münnig, Dietmar Wastian, Wolfgang Lorenz, Berthold Keggenhoff
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Patent number: 6936741Abstract: The present invention relates to a process for working up or treating aqueous waste waters which are formed during the nitration of toluene to dinitrotoluene with nitrating acid. These aqueous waste waters containing acidic wash water and alkaline wash water from the dinitrotoluene washing step, and distillate from the sulfuric acid concentration step. The process comprises, a) combining the acidic and alkaline waste waters from the washing step and the aqueous distillate from the sulfuric acid concentration step such that the resulting mixture has a pH below 5, b) separating the aqueous and organic phases which are formed by phase separation, c) subjecting the aqueous phase from b) to an extraction step, wherein d) the organic components contained in the aqueous phase from c) are extracted with toluene, and e) introducing the toluene phase enriched with the organic components into the toluene nitration.Type: GrantFiled: June 28, 2004Date of Patent: August 30, 2005Assignee: Bayer MaterialScience AGInventors: Jürgen Münnig, Dietmar Wastian, Wolfgang Lorenz, Berthold Keggenhoff
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Publication number: 20040267061Abstract: The invention relates to a process for the production of dinitrotoluene by the two-stage nitration of toluene.Type: ApplicationFiled: February 17, 2004Publication date: December 30, 2004Inventors: Erwin Dieterich, Anke Hielscher, Berthold Keggenhoff, Manfred Keller-Killewald, Jurgen Munnig, Dietmar Wastian
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Publication number: 20040267062Abstract: The present invention relates to a process for working up organic secondary components which are formed in the one-stage or two-stage nitration of toluene to dinitrotoluene. These organic secondary components are present in the acidic and alkaline waste water from the dinitrotoluene washing step and in the aqueous distillate from the sulfuric acid concentration step, together with small amounts of mononitrotoluene and dinitrotoluene.Type: ApplicationFiled: June 28, 2004Publication date: December 30, 2004Inventors: Jurgen Munnig, Dietmar Wastian, Wolfgang Lorenz, Berthold Keggenhoff
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Publication number: 20040262238Abstract: The present invention relates to a process for working up or treating aqueous waste waters which are formed during the nitration of toluene to dinitrotoluene with nitrating acid. These aqueous waste waters containing acidic wash water and alkaline wash water from the dinitrotoluene washing step, and distillate from the sulfuric acid concentration step.Type: ApplicationFiled: June 28, 2004Publication date: December 30, 2004Inventors: Jurgen Munnig, Dietmar Wastian, Wolfgang Lorenz, Berthold Keggenhoff
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Patent number: 6332949Abstract: A process for concentrating spent sulphuric acids particularly sulphuric acids which arise during the nitration of hydrocarbons with nitric acid in the presence of sulphuric acid, wherein single- or multi-stage concentration is effected under vacuum.Type: GrantFiled: March 30, 1999Date of Patent: December 25, 2001Assignee: Bayer AktiengesellschaftInventors: Heiko Beckhaus, Jürgen Münnig, Wolfgang Lorenz, Karl Schumacher
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Patent number: 6156288Abstract: A process is provided for the purification of sulfuric acid contaminated with impurities, such as nitric acid, nitrosylsulfuric acid, dinitrotoluenes and mononitrotoluenes, wherein this contaminated sulfuric acid was obtained from the production of nitrated toluene using toluene and nitric acid. The contaminated sulfuric acid is preheated to a temperature in the range of 50 to 180.degree. C. in a heat exchanger. The heated, contaminated sulfuric acid is freed from steam-volatile impurities, such as dinitrotoluenes and mononitrotoluenes, and the nitrogen-containing compounds within the sulfuric acid are decomposed by counter currently contacting the contaminated sulfuric acid with steam and vapors from a downstream concentration step in a steam stripper, which is operated at a pressure ranging from 300 to 1,000 mbars. The steam-stripped sulfuric acid is fed into a first concentration stage, which is operated at the same pressure used in the steam stripper.Type: GrantFiled: December 4, 1998Date of Patent: December 5, 2000Assignee: Bayer AktiengesellschaftInventors: Heiko Beckhaus, Jurgen Munnig, Dieter Grenner