Patents by Inventor Stefan Nordhoff
Stefan Nordhoff 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: 10087266Abstract: The present invention relates to the use of epoxy-terminated polydiene having terminal epoxy groups as oxygen scavenger, in particular as constituent in packaging.Type: GrantFiled: December 3, 2014Date of Patent: October 2, 2018Assignee: Evonik Degussa GmbHInventors: Niko Haberkorn, Peter Denkinger, Stefan Nordhoff, Uwe Numrich
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Publication number: 20160311949Abstract: The present invention relates to the use of epoxy-terminated polydiene having terminal epoxy groups as oxygen scavenger, in particular as constituent in packaging.Type: ApplicationFiled: December 3, 2014Publication date: October 27, 2016Inventors: Niko HABERKORN, Peter DENKINGER, Stefan NORDHOFF, Uwe NUMRICH
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Patent number: 8884070Abstract: Provided is a process for producing an aldehyde from an alkylene. The process includes (a) photocatalytically dehydrogenating at least one alkane to obtain a mixture comprising at least one olefin and hydrogen, (b) adding carbon dioxide and hydrogen to the mixture, and (c) hydroformylating the olefin to at least one aldehyde. The process also includes converting carbon dioxide and hydrogen into water and carbon monoxide prior to the hydroformylating. In addition, the conversion of carbon dioxide and hydrogen into water and carbon monoxide is performed by a reverse water gas shift reaction.Type: GrantFiled: June 16, 2011Date of Patent: November 11, 2014Assignee: EVONIK DEGUSSA GmbHInventors: Robert Franke, Dirk Fridag, Bart Hamers, Horst-Werner Zanthoff, Matthias Blug, Julia Strautmann, Stefan Nordhoff
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Publication number: 20140023582Abstract: The invention relates to novel complexes and to the use thereof as photosensitizers for generating hydrogen from water.Type: ApplicationFiled: October 28, 2011Publication date: January 23, 2014Applicant: Evonik Degussa GmbHInventors: Stefan Nordhoff, Uwe Dingerdissen, Jens Busse, Sascha Hoch, Matthias Blug, Horst-Werner Zanthoff, Felix Gaertner, Daniela Cozzula, Stefania Denurra, Anilkumar Gopinathan, Sebastian Losse, Henrik Junge, Serafino Gladiali, Matthias Beller
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Publication number: 20130178657Abstract: The problem addressed by the present invention is that of specifying a process for producing aldehydes which, compared with conventional hydroformylation, cuts CO2, which utilises alternative sources of raw materials, and which has no need for a step of providing carbon monoxide. This problem is solved by processes comprising the following steps: a) providing at least one alkane; b) photocatalytically dehydrogenating the alkane to a mixture comprising at least one olefin and hydrogen; c) adding carbon dioxide and hydrogen to the mixture; d) hydroformylating the olefin to at least one aldehyde. More particularly, n-butane is initially dehydrogenated photocatalytically and the resulting 1-butene is reacted with CO2 in a hydroformylation to form valeraldehyde.Type: ApplicationFiled: June 16, 2011Publication date: July 11, 2013Applicant: Evonik Oxeno GmbHInventors: Robert Franke, Dirk Fridag, Bart Hamers, Horst-Werner Zanthoff, Matthias Blug, Julia Strautmann, Stefan Nordhoff
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Publication number: 20130175371Abstract: A method for separating a particle mixture into a first and second fraction, the first fraction of particles having an electrical conductivity greater than the particles of the second fraction, by a) ionizing air to have the same polarity with a corona electrode; b) mixing the ionized air with a fluidized particle mixture containing two particle fractions with different electrical conductivities, to obtain a fluidized particle mixture ionized to have the same polarity; d) precipitating particles of the second fraction from the particle mixture on a collection electrode moving relative to the particle mixture, where the collection electrode is grounded or has an opposite charge to the corona electrode; e) removing particles adhered to the collection electrode as the second fraction; and f) obtaining the first fraction from particles of the particle mixture which do not adhere to the collection electrode.Type: ApplicationFiled: June 30, 2011Publication date: July 11, 2013Applicants: STEAG POWER MINERALS GmbH, Evonik Degussa GmbHInventors: Senada Schaack, Nicola Benscheidt, Frank Borchers, Matthias Berghahn, Stefan Nordhoff, Patrik Stenner
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Patent number: 8252120Abstract: The invention relates to a washing apparatus, including a First Region (1) to which a wash material (4) is supplied, a Second Region (2), in which the wash material (4) is washed, and a Third Region (3), in which the wash material (4) is melted and a flow resistance (6), which is provided between the Second Region (2) and the Third Region (3), a purification apparatus, a synthesis device, a method for purifying a wash material, and the use of a washing apparatus or a purification apparatus for purifying and then using the target product obtained by the purification.Type: GrantFiled: September 15, 2003Date of Patent: August 28, 2012Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Torsten Balduf, Joachim Deinken, Joachim Pohlisch, Axel Hengstermann
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Patent number: 7964689Abstract: The invention relates to a superabsorbent polymer that includes a (meth)acrylic acid made by a process that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The superabsorbent polymer according to the present invention includes an process to make (meth)acrylic acid, the apparatus suitable for implementing the process, and the use of the apparatus for the production of (meth)acrylic acid characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement, thereby providing an improved superabsorbent polymer.Type: GrantFiled: September 13, 2010Date of Patent: June 21, 2011Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Axel Kobus, Stefan Gross, Hans-Rolf Lausch, Torsten Balduf, Roland Fornika, Guenther Bub
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Publication number: 20110028664Abstract: The invention relates to a superabsorbent polymer that includes a (meth)acrylic acid made by a process that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The superabsorbent polymer according to the present invention includes an process to make (meth)acrylic acid, the apparatus suitable for implementing the process, and the use of the apparatus for the production of (meth)acrylic acid characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement, thereby providing an improved superabsorbent polymer.Type: ApplicationFiled: September 13, 2010Publication date: February 3, 2011Inventors: Stefan Nordhoff, Axel Kobus, Stefan Gross, Hans-Rolf Lausch, Torsten Balduf, Roland Fornika, Guenther Bub
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Patent number: 7803969Abstract: The invention relates to a process for the purification of (meth)acrylic acid in a process stage that comprises the following process steps: a) (meth)acrylic acid is crystallized out from a mother liquor; b) crystallized (meth)acrylic acid is separated from the mother liquor; c) at least part of the separated (meth)acrylic acid crystals are melted; d) the melted part is at least partially recycled to the step a) or step b). The process according to the invention, the apparatus suitable for implementing the process, and the use of the apparatus according to the invention for the production of (meth)acrylic acid are characterized by a high purity of the thereby obtainable (meth)acrylic acid as well as by a high efficiency with regard to the achievable yield and necessary energy requirement.Type: GrantFiled: January 14, 2002Date of Patent: September 28, 2010Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Axel Kobus, Stefan Gross, Hans-Rolf Lausch, Torsten Balduf, Roland Fornika, Guenther Bub
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Patent number: 7557245Abstract: The present invention relates to processes for purifying a composition containing (meth)acrylic acid, at least one impurity and water, wherein the composition has a water content in the range of 0.55 to 90, based on the composition, to form a purified phase containing (meth)acrylic acid and at least one impurity, wherein, in the purified phase, the quantity of at least one impurity is less than 7% by weight, based on (meth)acrylic acid in the purified phase.Type: GrantFiled: March 17, 2003Date of Patent: July 7, 2009Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Torsten Balduf, Gunther Bub, Roland Fornika, Jurgen Mosler, Thomas Rathke, Axel Kobus, Dennis Thong
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Patent number: 7557246Abstract: The present invention relates to a process for production of (meth)acrylic acid, whereby first a crude (meth)acrylic acid is produced and this crude (meth)acrylic acid is then continuously purified, whereby the continuous purification of the crude (meth)acrylic acid comprises the following process steps: a) in a composition comprising (meth)acrylic acid and impurities, precipitating the impurities in crystalline form from the composition; and b) separating the crystalline impurities precipitated from the composition. The invention also relates to the (meth)acrylic acid obtainable by this process, a device for production of (meth)acrylic acid, the use of the device or of a purification device for production of (meth)acrylic acid, (meth)acrylic acid, water-absorbing polymers, the use of water-absorbing polymers as well as fibers, sheets, foams and composites.Type: GrantFiled: July 15, 2005Date of Patent: July 7, 2009Assignee: Evonik Stockhausen GmbHInventors: Stefan Nordhoff, Torsten Balduf, Jürgen Mosler, Wilfried Uhlich, Dennis Thong Yu-Chiang, Axel Kobus, Arndt Selbach, Jürgen Kohn
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Publication number: 20090149562Abstract: A process for the preparation of (meth)acrylic acid is disclosed that includes: (a) contacting a product gas containing (meth)acrylic acid obtained from a gas phase oxidation with an aqueous phase in a quenching unit to obtain an aqueous quenched phase, (b) distilling the quenched phase in a distillation unit to obtain a bottom product and a top product, and (c) crystallizing at least the bottom product in a crystallization unit to obtain pure (meth)acrylic acid. An organic separating agent can be added after the quenching unit, such as at the latest in the crystallization unit. Also disclosed are a device for the preparation of (meth)acrylic acid, a process for the preparation of a polymer from the (meth)acrylic acid, a device for the preparation of the polymer, a polymer obtainable by this process, and the use of the (meth)acrylic acid or the polymer in a chemical product, such as fibers or shaped articles.Type: ApplicationFiled: September 13, 2005Publication date: June 11, 2009Inventors: Stefan Nordhoff, Thomas Rathke, Torsten Balduf, Axel Kobus, Dennis Thong Yu-Chiang, Jorg Leistner
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Publication number: 20090134357Abstract: The present invention relates to a process for production of acrylic acid, comprising at least the following steps: a. dehydrating glycerine to a dehydration product comprising acrolein; b. gas phase oxidation of the dehydration product comprising acrolein to obtain a monomer gas comprising an acrylic acid; c. bringing into contact the monomer gas with a quench means to obtain a quench phase comprising acrylic acid; and d. processing the quench phase comprising acrylic acid to obtain a monomer phase comprising acrylic acid. The present invention may also relate to a process for preparation of polymers by radical polymerization of acrylic acid, the water-absorbing polymers obtainable by this process, water-absorbing polymers based to at least 25 wt % upon partially neutralized acrylic acid, a composite, a device for preparation of acrylic acid, a process for preparation of acrylic acid, and the acrylic acid obtainable by this process.Type: ApplicationFiled: February 28, 2006Publication date: May 28, 2009Inventors: Gunther Bub, Jurgen Mosler, Andreas Sabbagh, Franz-Felix Kuppinger, Stefan Nordhoff, Guido Stochniol, Jorg Sauer, Udo Knippenberg, Franck Furno, Gunter Latoschinski, Michael Bernd Fricke, Horst-Werner Zanthoff
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Patent number: 7495129Abstract: The invention concerns a process for purification of an acidic monomer having a double bond, as well as a device for synthesis of an acidic monomer having a double bond, a process for producing an acidic monomer having a double bond, an acid monomer having a double bond and obtainable by this process, fibers, formed bodies, films, foams, superabsorbent polymers and other special polymers based on or containing this acidic monomer, the use of this acidic monomer in or for producing fibers, formed bodies, films, foams, superabsorbent polymers or other special polymers.Type: GrantFiled: January 13, 2004Date of Patent: February 24, 2009Assignee: Evonik Stockhausen GmbHInventors: Torsten Balduf, Stefan Nordhoff, Dennis Thong Yu-Chiang, Axel Kobus, Martin Roos
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Publication number: 20080119668Abstract: A process for the preparation of (meth)acrylic acid is disclosed that includes: (a) contacting a product gas containing (meth)acrylic acid obtained from a gas phase oxidation with an aqueous phase in a quenching unit to obtain an aqueous quenched phase, (b) contacting the quenched phase with an organic separating agent in an extraction unit to give a first phase and at least one other phase, (c) crystallizing at least one of the first phase and the at least one other phase, such as by a suspension crystallization, in a crystallization unit to obtain a pure (meth)acrylic acid. Also disclosed are a device for the preparation of (meth)acrylic acid, a process for the preparation of a polymer from the (meth)acrylic acid, a device for the preparation of the polymer, a polymer obtainable by this process, and the use of the (meth)acrylic acid or the polymer in a chemical product, such as fibers or shaped articles.Type: ApplicationFiled: September 13, 2005Publication date: May 22, 2008Inventors: Stefan Nordhoff, Axel Kobus, Torsten Balduf, Thomas Rathke, Dennis Thong Yu-Chiang, Jorg Leistner
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Publication number: 20080091048Abstract: The present invention relates to a process for production of (meth)acrylic acid, whereby first a crude (meth)acrylic acid is produced and this crude (meth)acrylic acid is then continuously purified, whereby the continuous purification of the crude (meth)acrylic acid comprises the following process steps: a) in a composition comprising (meth)acrylic acid and impurities, precipitating the impurities in crystalline form from the composition; and b) separating the crystalline impurities precipitated from the composition. The invention also relates to the (meth)acrylic acid obtainable by this process, a device for production of (meth)acrylic acid, the use of the device or of a purification device for production of (meth)acrylic acid, (meth)acrylic acid, water-absorbing polymers, the use of water-absorbing polymers as well as fibers, sheets, foams and composites.Type: ApplicationFiled: July 15, 2005Publication date: April 17, 2008Applicant: STOCKHAUSEN GMBHInventors: Stefan Nordhoff, Torsten Balduf, Jurgen Mosler, Wilfired Uhlich, Dennis Thong Yu-Chiang, Axel Kobus, Arndt Selbach, Jurgen Kohn
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Publication number: 20080085990Abstract: A process for preparing a polyarylene ether ketone comprises the following process steps: a) reaction of an aromatic dihalogen compound with a bisphenol and/or a halophenol in the presence of alkali metal and/or alkaline earth metal carbonate or hydrogencarbonate in a high-boiling aprotic solvent to give a polyarylene ether ketone, b) wet comminution and simultaneous preextraction of the solidified reaction mixture, c) extraction and filtration of the wet-comminuted product in a pressure suction filter and d) drying of the extracted product. This combination enables improved workup of the reaction mixture.Type: ApplicationFiled: November 18, 2005Publication date: April 10, 2008Applicant: DEGUSSA GmbHInventors: Alexander Richter, Bernd Gunzel, Christian Bierhaus, Patrick Kreidler, Stefan Nordhoff, Michael Krenz
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Publication number: 20070280866Abstract: The present invention relates to a process for cleaving a (meth)acrylic acid oligomer of structure I wherein R1 is a hydrogen atom or a C1 to C10 alkyl groups, R2 is a hydrogen atom or a methyl group, and n is a whole number within the range between 1 and 200, optionally in the presence of a cleaving agent of the structure R3—OH or of the structure (R4)2—N—H, whereby R3 is a hydrogen atom, a C1 to C12 alkyl group, or a —CxH2x—OH— group, whereby x is a whole number within a range from 1 to 12, and R4 is a hydrogen atom or a C1 to C12 alkyl group, with the proviso that not both R4 groups are hydrogen atoms, whereby the (meth)acrylic acid oligomers are heated with the cleaving agent to a temperature of at least 50° C. at a pressure of at least 1 bar.Type: ApplicationFiled: February 18, 2005Publication date: December 6, 2007Inventors: Torsten Balduf, Jurgen Mosler, Thomas Rathke, Dennis Thong Yu-Chiang, Axel Kobus, Rudolf Burghardt, Michael Fricke, Stefan Nordhoff
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Publication number: 20070274882Abstract: The invention relates to a reactor at least comprising, connected with each other in fluid-communicating fashion: a reaction area, whereby the reaction area comprises at least one solid-state catalyst; a coolable heat exchanger area, whereby the heat exchanger area comprises at least one housing, whereby the housing accommodates at least partially an insert, whereby the insert comprises a plurality of elements, a process for oxidation of a hydrocarbon using the reactor, an oxidized hydrocarbon product obtainable by this process, chemical products, such as fibers, sheets, formed bodies and the like based on this oxidized hydrocarbon product as well as the use of this oxidized hydrocarbon product in chemical products of this type.Type: ApplicationFiled: February 4, 2005Publication date: November 29, 2007Inventors: Jurgen Mosler, Torsten Balduf, Dennis Thong, Jorg Leistner, Stefan Nordhoff, Michael Fricke, Oliver Becker