Patents by Inventor Armin Diefenbacher
Armin Diefenbacher 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: 8431743Abstract: The present invention relates to a process for preparing acrylic acid by two-stage heterogeneously catalyzed partial gas phase oxidation of propylene, in which the propylene source used is a preceding propane dehydrogenation and in which the first oxidation stage is operated with restricted propylene conversion, and unconverted propane and propylene present in the product gas mixture of the second partial oxidation stage are recycled substantially into the preceding propane dehydrogenation.Type: GrantFiled: May 18, 2005Date of Patent: April 30, 2013Assignee: BASF AktiengesellschaftInventors: Martin Dieterle, Klaus Joachim Mueller-Engel, Claus Hechler, Ulrich Hammon, Armin Diefenbacher
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Patent number: 8338640Abstract: A process for heterogeneously catalyzed partial direct oxidation of propane and/or isobutane, in which target product is removed in a workup stage from the product gas mixture obtained in the reaction stage, the remaining residual product gas mixture is divided into two portions of the same composition, one portion is recycled into the reaction stage and the other portion is discharged, and both the reaction stage and the workup stage are operated at elevated pressure.Type: GrantFiled: April 2, 2004Date of Patent: December 25, 2012Assignee: BASF AktiengesellschaftInventors: Otto Machhammer, Sven Crone, Frieder Borgmeier, Klaus Joachim Mueller-Engel, Christoph Adami, Armin Diefenbacher
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Patent number: 8216342Abstract: A method for producing membranes which contain at least one solid layer on one side of a porous substrate by treating the side of the support, which is to be coated, with a synthetic solution that forms the solid layer. The inventive method is characterized in that the space located behind the side of the porous support, which is not to be coated, is filled with an inert fluid during the production of the solid layer on the porous support, “behind” being from the perspective of the support. The pressure and/or the temperature of the fluid is/are selected such that the synthetic solution is essentially prevented from entering in contact with the side of the porous support, which is not to be coated.Type: GrantFiled: January 13, 2005Date of Patent: July 10, 2012Assignee: BASF SEInventors: Stefan Bitterlich, Hartwig Voβ, Gunter Schuch, Armin Diefenbacher, Manfred Noack, Ronald Schäfer, Ingolf Voigt, Hannes Richter, Jürgen Caro
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Patent number: 8196755Abstract: A process for the production of a composite membrane, one or more microporous separation layers comprising a zeolite of the MFI type being produced by hydrothermal synthesis on a porous substrate, wherein one or more additives from the group consisting of linear (C1-C4)-alcohols, ammonia, primary, secondary and tertiary amines having in each case (C1-C4)-alkyl radicals, (C1-C4)-aminoalcohols and (C3-C4)-ketones are added to the synthesis solution for the hydrothermal synthesis.Type: GrantFiled: May 21, 2007Date of Patent: June 12, 2012Assignee: BASF SEInventors: Armin Diefenbacher, Hartwig Voss, Gunter Schuch, Manfred Noack, Ingolf Voigt, Hannes Richter, Juergen Caro
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Patent number: 8197645Abstract: The present invention relates to a process for separating at least one propylene glycol from a mixture (M) comprising water and said propylene glycol, said process comprising (I) evaporating the mixture in at least two evaporation and/or distillation stages at decreasing operating pressures of the evaporators and/or distillation columns obtaining mixture (M?) and mixture (M?); (II) separating the mixture (M?) obtained in (I) in at least one further distillation step, obtaining a mixture (M-I) comprising at least 70 wt.-% of water and a mixture (M-II) comprising less than 30 wt.-% of water.Type: GrantFiled: December 13, 2006Date of Patent: June 12, 2012Assignees: BASF Aktiengesellschaft, The Dow Chemical CompanyInventors: Armin Diefenbacher, Hans-Georg Goebbel, Stefan Bitterlich, Hartwig Voss, Henning Schultz, Anna Forlin, Renate Patrascu
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Patent number: 8097232Abstract: A catalytic process for preparing chlorine from hydrogen chloride, which includes recycle of process streams with reduced accumulation of inert gases in the system is provided. The process includes a step wherein a compressed liquid stream comprising chlorine, carbon dioxide and oxygen is recycled into a column countercurrent to the ascending gas phase and feeding part of the chlorine-rich liquid phase leaving the bottom of the column back into the top of the column. Carbon dioxide present in the ascending gas stream is dissolved out of the gas stream and can later be separated from chlorine without problems by distillation.Type: GrantFiled: February 20, 2006Date of Patent: January 17, 2012Assignee: BASF AktiengesellschaftInventors: Martin Sesing, Armin Diefenbacher, Hartwig Voss, Olga Schubert, Lothar Seidemann, Martin Karches, Thomas Grassler, Eckhard Stroefer
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Patent number: 7968076Abstract: The invention relates to a process for the preparation of sodium dithionite, comprising the steps (a) provision of a synthesis batch comprising sodium formate, sulfur dioxide and an alkaline sodium compound in aqueous methanolic solution with formation of a sodium dithionite mother liquor, (b) isolation of sodium dithionite from the sodium dithionite mother liquor, a residual mother liquor being obtained, (c) separation of methanol from the residual mother liquor, (d) separation of the residual mother liquor into a thiosulfate-rich first part-stream and a thiosulfate-poor, formate-containing second part-stream by means of nanofiltration, (e) concentration of sodium formate in the second part-stream and (f) recycling of the concentrated second part-stream to process step (a).Type: GrantFiled: November 3, 2005Date of Patent: June 28, 2011Assignee: BASF SEInventors: Armin Diefenbacher, Hartwig Voss, Reinhard Schneider
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Patent number: 7847073Abstract: A process for producing a liquid formulation of salts of sulfonated azo dyes by coupling an at least equimolar amount of diazotized aminoarylsulfonic acids I H2N—Ar—SO3H??(I), where Ar is phenylene (which may be monosubstituted by sulfo) or naphthylene (which may be mono- or disubstituted by sulfo and/or monosubstituted by hydroxyl) onto the coupling product of an unsubstituted or methyl-substituted phenylenediamine with itself comprises dissolving the azo dye in a basic medium and then subjecting the solution to a nanofiltration.Type: GrantFiled: May 18, 2005Date of Patent: December 7, 2010Assignee: BASF AktiengesellschaftInventors: Gunter-Rudolf Schroeder, Juergen Decker, Helmut Reichelt, Ingo Klopp, Armin Diefenbacher, Hartwig Voss
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Patent number: 7807853Abstract: A process for heterogeneously catalyzed partial gas phase oxidation of propylene to acrylic acid in the absence of propane as an inert diluent gas, in which, in the starting reaction gas mixture, cyclopropane is substantially avoided as an impurity and crude propylene is used additionally as a propylene source.Type: GrantFiled: December 4, 2006Date of Patent: October 5, 2010Assignee: BASF AktiengesellschaftInventors: Martin Dieterle, Armin Diefenbacher, Klaus Joachim Mueller-Engel, Jochen Petzoldt
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Patent number: 7749414Abstract: Composite membranes comprising at least one porous substrate layer and at least one microporous separation layer, comprising at least one zeolite of the MFI type, are described, the separation layer being produced by a hydrothermal synthesis in which the molar ratio of silicon to aluminum is greater than 120 and the separation layer contains less than 10% by weight of aluminum in elemental or chemically bound form in a zone of at least 100 nm adjacent to the separation layer.Type: GrantFiled: January 5, 2005Date of Patent: July 6, 2010Assignee: BASF AGInventors: Stefan Bitterlich, Hartwig Voβ, Gunter Schuch, Armin Diefenbacher, Manfred Noack, Ronald Schäfer, Ingolf Voigt, Hannes Richter, Jürgen Caro
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Patent number: 7723549Abstract: A process for preparing at least one target product by partial oxidation and/or ammoxidation of propylene, in which the propylene source used is a propane dehydrogenation, the propane used therein being obtained by a rectificative prepurification of crude propane.Type: GrantFiled: April 27, 2006Date of Patent: May 25, 2010Assignee: BASF AktiengesellschaftInventors: Armin Diefenbacher, Claus Hechler, Christoph Adami, Martin Dieterle
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Patent number: 7592483Abstract: A process for preparing acrolein or acrylic acid or a mixture thereof by heterogeneously catalyzed partial gas oxidation of propylene, in which the starting reaction gas mixture has the following contents: from 6 to 9% by volume of propylene, from 8 to 18% by volume of molecular oxygen, from 6 to 30% by volume of propane and from 32 to 72% by volume of molecular nitrogen.Type: GrantFiled: May 18, 2005Date of Patent: September 22, 2009Assignee: BASF AktiengesellschaftInventors: Martin Dieterle, Armin Diefenbacher, Goetz-Peter Schindler, Catharina Klanner, Klaus Joachim Mueller-Engel, Christoph Adami
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Patent number: 7589236Abstract: A process for separating acrylic acid and benzoic acid present in the product gas mixture of a partial oxidation to acrylic acid, in which the acrylic acid and the benzoic acid are first converted to a liquid phase, constituents having a lower boiling point than benzoic acid and acrylic acid are removed therefrom by thermal separating processes, and the acrylic acid is removed by crystallization from the remaining liquid phase.Type: GrantFiled: October 17, 2007Date of Patent: September 15, 2009Assignee: BASF AktiengesellschaftInventors: Joerg Heilek, Klaus Joachim Mueller-Engel, Martin Dieterle, Armin Diefenbacher
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Publication number: 20090200236Abstract: A process for the production of a composite membrane, one or more microporous separation layers comprising a zeolite of the MFI type being produced by hydrothermal synthesis on a porous substrate, wherein one or more additives from the group consisting of linear (C1-C4)-alcohols, ammonia, primary, secondary and tertiary amines having in each case (C1-C4)-alkyl radicals, (C1-C4)-aminoalcohols and (C3-C4)-ketones are added to the synthesis solution for the hydrothermal synthesis.Type: ApplicationFiled: May 21, 2007Publication date: August 13, 2009Applicant: BASF SEInventors: Armin Diefenbacher, Hartwig Voss, Gunter Schuch, Manfred Noack, Ingolf Voigt, Hannes Richter, Jürgen Caro
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Patent number: 7566804Abstract: A process for preparing acrylic acid, in which an acrylic acid-comprising product gas mixture obtained by catalytic gas phase partial oxidation of a C3 precursor of acrylic acid is fractionally condensed in a condensation column provided with internals ascending into itself with side draw removal of crude acrylic acid and with liquid phase draw removal of acrylic acid-comprising acid water, and acrylic acid present in acid water is taken up into an extractant and then removed from the extractant and recycled into the condensation column, or taken up in aqueous metal hydroxide, or sent to further purification of the crude acrylic acid.Type: GrantFiled: January 25, 2008Date of Patent: July 28, 2009Assignee: BASF AktiengesellschaftInventors: Armin Diefenbacher, Ulrich Hammon, Volker Schliephake, Georg Sieder
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Publication number: 20080289948Abstract: The present invention relates to a process for separating at least one propylene glycol from a mixture (M) comprising water and said propylene glycol, said process comprising (I) evaporating the mixture in at least two evaporation and/or distillation stages at decreasing operating pressures of the evaporators and/or distillation columns obtaining mixture (M?) and mixture (M?); (II) separating the mixture (M?) obtained in (I) in at least one further distillation step, obtaining a mixture (M-I) comprising at least 70 wt.-% of water and a mixture (M-II) comprising less than 30 wt.-% of water.Type: ApplicationFiled: December 13, 2006Publication date: November 27, 2008Applicants: BASF SE, THE DOW CHEMICAL COMPANYInventors: Armin Diefenbacher, Hans-Georg Gobbel, Stefan Bitterlich, Hartwig Voss, Henning Schultz, Anna Forlin, Renate Patrascu
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Publication number: 20080187484Abstract: The invention relates to a process for the preparation of sodium dithionite, comprising the steps (a) provision of a synthesis batch comprising sodium formate, sulfur dioxide and an alkaline sodium compound in aqueous methanolic solution with formation of a sodium dithionite mother liquor, (b) isolation of sodium dithionite from the sodium dithionite mother liquor, a residual mother liquor being obtained, (c) separation of methanol from the residual mother liquor, (d) separation of the residual mother liquor into a thiosulfate-rich first part-stream and a thiosulfate-poor, formate-containing second part-stream by means of nanofiltration, (e) concentration of sodium formate in the second part-stream and (f) recycling of the concentrated second part-stream to process step (a).Type: ApplicationFiled: November 3, 2005Publication date: August 7, 2008Inventors: Armin Diefenbacher, Hartwig Voss, Reinhard Schneider
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Publication number: 20080183014Abstract: A process for preparing acrylic acid, in which an acrylic acid-comprising product gas mixture obtained by catalytic gas phase partial oxidation of a C3 precursor of acrylic acid is fractionally condensed in a condensation column provided with internals ascending into itself with side draw removal of crude acrylic acid and with liquid phase draw removal of acrylic acid-comprising acid water, and acrylic acid present in acid water is taken up into an extractant and then removed from the extractant and recycled into the condensation column, or taken up in aqueous metal hydroxide, or sent to further purification of the crude acrylic acid.Type: ApplicationFiled: January 25, 2008Publication date: July 31, 2008Applicant: BASF SEInventors: Armin DIEFENBACHER, Ulrich Hammon, Volker Schliephake, Georg Sieder
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Publication number: 20080159948Abstract: Process for preparing chlorine from hydrogen chloride, which comprises the steps: a) feeding of a stream a1 comprising hydrogen chloride and of a stream a2 comprising oxygen into an oxidation zone and catalytic oxidation of hydrogen chloride to chlorine, giving a product gas stream a3 comprising chlorine, water, oxygen, carbon dioxide and inert gases; b) cooling of the product gas stream a3 and removal of water and hydrogen chloride as aqueous hydrochloric acid, leaving a gas stream b comprising chlorine, water, oxygen, carbon dioxide and inert gases; c) optional drying of the gas stream b) to leave a gas stream c which is substantially free of water and comprises chlorine, oxygen, carbon dioxide and inert gases; d) at least partial liquefaction of the gas stream c and of a chlorine-rich recycle stream f1 comprising chlorine, oxygen and carbon dioxide by compression and cooling, giving an at least partially liquefied stream d; e) gas/liquid separation of the stream d into a gas stream e1 comprising chlorine,Type: ApplicationFiled: February 20, 2006Publication date: July 3, 2008Applicant: BASF AktiengesellschaftInventors: Martin Sesing, Armin Diefenbacher, Hartwig Voss, Olga Schubert, Lothar Seidemann, Martin Karches, Thomas Grassler, Eckhard Stroefer
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Publication number: 20080097123Abstract: A process for separating acrylic acid and benzoic acid present in the product gas mixture of a partial oxidation to acrylic acid, in which the acrylic acid and the benzoic acid are first converted to a liquid phase, constituents having a lower boiling point than benzoic acid and acrylic acid are removed therefrom by thermal separating processes, and the acrylic acid is removed by crystallization from the remaining liquid phase.Type: ApplicationFiled: October 17, 2007Publication date: April 24, 2008Applicant: BASFAktiengesellschaftInventors: Jorg Heilek, Klaus Joachim Muller-Engel, Martin Dieterle, Armin Diefenbacher