Patents by Inventor Leo Denissen
Leo Denissen 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: 9115049Abstract: A process for obtaining pure aniline contains catalytically hydrogenating nitrobenzene, to obtain a reaction mixture, separating the reaction mixture into a gas phase containing hydrogen and a liquid phase, liquid/liquid phase separating the liquid phase to obtain an aqueous phase and also crude aniline containing water as an organic phase, distillatively pre-purifying the crude aniline by removing the water via an overhead stream of a first distillation column to obtain a first bottom stream, feeding the first bottom stream as a feed stream to a pure column from which a pure aniline stream is taken off at the top and a second bottom stream containing high boilers is taken off, and passing the second bottom stream to incineration, by pumping the second bottom stream through heated pipelines and by adding methanol, ethanol, propanol, and/or acetone to the second bottom stream.Type: GrantFiled: October 4, 2013Date of Patent: August 25, 2015Assignee: BASF SEInventors: Koenraad Vandewalle, Karen Vercruysse, Leo Denissen, Filip Deberdt, Hendrik De Winne, Bart Van De Voorde, Michael Reiser, Samuel Neto
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Patent number: 8703997Abstract: What is proposed is a process for preparation and distillative workup of diphenylmethane diisocyanate (MDI), proceeding from a benzene-comprising feedstream, in which, in a catalytic hydrogenation of nitrobenzene to aniline, steam is raised at two different pressure levels, which partly or completely covers the energy demand for the overall process, by using two fluidized bed reactors of identical design, of which a first fluidized bed reactor is operated with an aniline load for which the fluidized bed reactors have been designed and provides steam at a first, lower pressure level, and a second fluidized bed reactor is operated with a load lowered with respect to the first fluidized bed reactor to such an extent that the second fluidized bed reactor affords steam at the higher pressure level.Type: GrantFiled: October 20, 2010Date of Patent: April 22, 2014Assignee: BASF SEInventors: Christian Schneider, Nikolaus Zafred, Andreas Heussler, Leo Denissen, Lucia Koenigsmann
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Publication number: 20140107378Abstract: A process for obtaining pure aniline contains catalytically hydrogenating nitrobenzene, to obtain a reaction mixture, separating the reaction mixture into a gas phase containing hydrogen and a liquid phase, liquid/liquid phase separating the liquid phase to obtain an aqueous phase and also crude aniline containing water as an organic phase, distillatively pre-purifying the crude aniline by removing the water via an overhead stream of a first distillation column to obtain a first bottom stream, feeding the first bottom stream as a feed stream to a pure column from which a pure aniline stream is taken off at the top and a second bottom stream containing high boilers is taken off, and passing the second bottom stream to incineration, by pumping the second bottom stream through heated pipelines and by adding methanol, ethanol, propanol, and/or acetone to the second bottom stream.Type: ApplicationFiled: October 4, 2013Publication date: April 17, 2014Applicant: BASF SEInventors: Koenraad VANDEWALLE, Karen VERCRUYSSE, Leo DENISSEN, Filip DEBERDT, Hendrik DE WINNE, Bart VAN DE VOORDE, Michael REISER, Samuel NETO
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Patent number: 8697921Abstract: The invention relates to a process for purifying crude aromatic nitro compounds which originate from the nitration of aromatic compounds, comprising the single or multiple performance of the following wash stage (a): (a) contacting the crude aromatic nitro compound (N-in) with an aqueous phase (W-res) and then separating the phases to obtain an organic phase (N-res) and an aqueous phase (W-res), wherein at least one demulsifier (D) is present in one or more of the wash stages (a).Type: GrantFiled: August 8, 2012Date of Patent: April 15, 2014Assignee: BASF SEInventors: Petra Deckert, Leo Denissen, Bart Van De Voorde, Julia Leschinski, Stefan Robert Deibel, Matthias Fankhaenel, Samuel Neto
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Patent number: 8592637Abstract: The present invention relates to a process for continuously preparing a mononitrated organic compound, especially a process for preparing mononitrobenzene. The invention relates more particularly to an improved continuous adiabatic process for preparing nitrobenzene.Type: GrantFiled: August 20, 2010Date of Patent: November 26, 2013Assignee: BASF SEInventors: Leo Denissen, Eckhard Stroefer, Jan-Dirk Arndt, Torsten Mattke, Kerstin Heinen, Julia Leschinski
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Publication number: 20130041189Abstract: The invention relates to a process for purifying crude aromatic nitro compounds which originate from the nitration of aromatic compounds, comprising the single or multiple performance of the following wash stage (a): (a) contacting the crude aromatic nitro compound (N-in) with an aqueous phase (W-res) and then separating the phases to obtain an organic phase (N-res) and an aqueous phase (W-res), wherein at least one demulsifier (D) is present in one or more of the wash stages (a).Type: ApplicationFiled: August 8, 2012Publication date: February 14, 2013Applicant: BASF SEInventors: Petra DECKERT, Leo Denissen, Bart Van De Voorde, Julia Leschinski, Stefan Robert Deibel, Matthias Fankhänel, Samuel Neto
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Publication number: 20130041188Abstract: The invention relates to a process for purifying crude aromatic nitro compounds which originate from the nitration of aromatic compounds, comprising the following wash stages (a1) and (a2), where each of stages (a1) and (a2) may be performed once or more than once in succession: (a1) contacting the crude aromatic nitro compound (N1-in) with a first aqueous phase (W1-in) comprising at least one base (B) and then separating the phases to obtain an organic phase (N1-res)and an aqueous phase (W1-res); and then (a2) contacting the organic phase (N1-res) obtained in stage (a1) with a second aqueous phase (W2-in) and then separating the phases to obtain a purified organic phase (N2-res) and at least one aqueous phase (W2-res), the aqueous phase used (W2-in) having a pH of 6 to 9.Type: ApplicationFiled: August 6, 2012Publication date: February 14, 2013Applicant: BASF SEInventors: Julia Leschinski, Petra Deckert, Leo Denissen, Bart Van De Voorde, Stefan Robert Deibel, Matthias Fankhänel, Samuel Neto
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Publication number: 20120205308Abstract: The invention relates to a process for working up wastewaters which are obtained in the purification of crude aromatic nitro compounds after the nitration of aromatic compounds, comprising the following steps: (a) single-stage or multistage washing of the crude aromatic nitro compound to obtain at least one organic phase and at least one aqueous phase, and removal of the aqueous phase or of the aqueous phases, step (a) comprising the addition of a base other than ammonia, and then (b) optional removal of organic constituents from at least a portion of the aqueous phase or aqueous phases obtained in step (a) by stripping, preferably with steam, then (c) removal of organic compounds from at least a portion of the aqueous phase or aqueous phases resulting from step (a) or step (b) by thermal and/or oxidative degradation, then (d) distillative depletion of ammonia from at least a portion of the aqueous phase or aqueous phases resulting from step (c), and then (e) optional supply of at least a portion of the aqType: ApplicationFiled: August 10, 2011Publication date: August 16, 2012Applicant: BASF SEInventors: Julia Leschinski, Leo Denissen, Ludwig E. Heck, Peter Gammer, Bart Van De Voorde, Andreas Heußler, Samuel Neto
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Publication number: 20120157709Abstract: What is proposed is a process for preparation and distillative workup of diphenylmethane diisocyanate (MDI), proceeding from a benzene-comprising feedstream, in which, in a catalytic hydrogenation of nitrobenzene to aniline, steam is raised at two different pressure levels, which partly or completely covers the energy demand for the overall process, by using two fluidized bed reactors of identical design, of which a first fluidized bed reactor is operated with an aniline load for which the fluidized bed reactors have been designed and provides steam at a first, lower pressure level, and a second fluidized bed reactor is operated with a load lowered with respect to the first fluidized bed reactor to such an extent that the second fluidized bed reactor affords steam at the higher pressure level.Type: ApplicationFiled: October 20, 2010Publication date: June 21, 2012Applicant: BASF SEInventors: Christian Schneider, Nikolaus Zafred, Andreas Heussler, Leo Denissen, Lucia Koenigsmann
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Publication number: 20120157722Abstract: The present invention relates to a process for continuously preparing a mononitrated organic compound, especially a process for preparing mononitrobenzene. The invention relates more particularly to an improved continuous adiabatic process for preparing nitrobenzene.Type: ApplicationFiled: August 20, 2010Publication date: June 21, 2012Applicant: BASF SEInventors: Leo Denissen, Eckhard Stroefer, Jan-Dirk Arndt, Torsten Mattke, Kerstin Heinen, Julia Leschinski