Patents by Inventor Dieter Buss
Dieter Buss 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: 9206121Abstract: A method to produce D,L-Methionine from 2-hydroxy-4-(methylthio)butyronitrile by reaction with ammonia, optionally in the presence of carbon dioxide, is provided. The 2-hydroxy-4-(methylthio)butyronitrile is obtained by reaction of 3-methylmercaptopropionaldehyde with hydrogen cyanide in the presence of a base as catalyst in a main reaction zone of a multizone reactor. Residual gaseous hydrogen cyanide is removed from the main reaction zone to an absorption and post-reaction zone of the reactor which comprises a mixture of 3-methylmercaptopropionaldehyde and the catalyst; and the gaseous hydrogen cyanide is further reacted with the 3-methylmercaptopropionaldehyde in the absorption and post reaction zone. A molar ratio of hydrogen cyanide to 3-(methylthio)propanal in the main reaction zone is from 0.98 to 1.03.Type: GrantFiled: March 27, 2015Date of Patent: December 8, 2015Assignee: EVONIK DEGUSSA GmbHInventors: Dieter Buss, Martin Steurenthaler, Michael R. Rinner, Stephan Kretz, Hans Joachim Hasselbach, Caspar-Heinrich Finkeldei, Martin Koerfer, Pablo Zacchi
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Patent number: 9133113Abstract: A method for the production of 2-hydroxy-4-methylthiobutyric acid by hydrolysis of 2-hydroxy-4-(methylthio)butyronitrile is provided. 3-Methylmercaptopropionaldehyde is reacted with hydrogen cyanide in the presence of a base as catalyst in a main reaction zone of the multizone reactor to form a reaction mixture comprising the 2-hydroxy-4-(methylthio)butyronitrile, unreacted 3-methylmercaptopropionaldehyde, the catalyst and residual amounts of gaseous hydrogen cyanide. The residual gaseous hydrogen cyanide is removed from the main reaction zone to an absorption and post-reaction zone of the reactor which comprises a mixture of 3-methylmercaptopropionaldehyde and the catalyst; and the gaseous hydrogen cyanide is further reacted with the 3-methylmercaptopropionaldehyde in the absorption and post reaction zone. A molar ratio of hydrogen cyanide to 3-(methylthio)propanal in the main reaction zone is from 0.98 to 1.03.Type: GrantFiled: March 27, 2014Date of Patent: September 15, 2015Assignee: EVONIK DEGUSSA GmbHInventors: Dieter Buss, Martin Steurenthaler, Michael R. Rinner, Stephan Kretz, Hans Joachim Hasselbach, Caspar-Heinrich Finkeldei, Martin Koerfer, Pablo Zacchi
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Publication number: 20150197489Abstract: A method to produce D,L-Methionine from 2-hydroxy-4-(methylthio)butyronitrile by reaction with ammonia, optionally in the presence of carbon dioxide, is provided. The 2-hydroxy-4-(methylthio)butyronitrile is obtained by reaction of 3-methylmercapto-propionaldehyde with hydrogen cyanide in the presence of a base as catalyst in a main reaction zone of a multizone reactor. Residual gaseous hydrogen cyanide is removed from the main reaction zone to an absorption and post-reaction zone of the reactor which comprises a mixture of 3-methylmercaptopropionaldehyde and the catalyst; and the gaseous hydrogen cyanide is further reacted with the 3-methylmercaptopropionaldehyde in the absorption and post reaction zone. A molar ratio of hydrogen cyanide to 3-(methylthio)propanal in the main reaction zone is from 0.98 to 1.03.Type: ApplicationFiled: March 27, 2015Publication date: July 16, 2015Applicant: Evonik Degussa GmbHInventors: Dieter Buss, Martin Steurenthaler, Michael R. Rinner, Stephan Kretz, Hans Joachim Hasselbach, Caspar-Heinrich Finkeldei, Martin Koerfer, Pablo Zacchi
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Patent number: 8809576Abstract: The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.Type: GrantFiled: February 1, 2010Date of Patent: August 19, 2014Assignee: Evonik Degussa GmbHInventors: Alexander Schraven, Thomas Tacke, Thomas Haas, Christoph Kobler, Dieter Buss, Axel Ronneburg, Olivier Zehnacker
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Publication number: 20140213819Abstract: A method for the production of 2-hydroxy-4-(methylthio)butyronitrile having good storage stability in a multi-zone reactor, is provided. 3-methylmercaptopropionaldehyde is reacted with hydrogen cyanide in the presence of a base as catalyst in a main reaction zone of the multizone reactor to form a reaction mixture comprising the 2-hydroxy-4-(methylthio)butyronitrile, unreacted 3-methylmercaptopropionaldehyde, the catalyst and residual amounts of gaseous hydrogen cyanide. The residual gaseous hydrogen cyanide is removed from the main reaction zone to an absorption and post-reaction zone of the reactor which comprises a mixture of 3-methylmercaptopropionaldehyde and the catalyst; and the gaseous hydrogen cyanide is further reacted with the 3-methylmercaptopropionaldehyde in the absorption and post reaction zone. A molar ratio of hydrogen cyanide to 3-(methylthio)propanal in the main reaction zone is from 0.98 to 1.03.Type: ApplicationFiled: March 27, 2014Publication date: July 31, 2014Applicant: EVONIK DEGUSSA GmbHInventors: Dieter BUSS, Martin STEURENTHALER, Michael R. RINNER, Stephan KRETZ, Hans Joachim HASSELBACH, Caspar-Heinrich FINKELDEI, Martin KOERFER, Pablo ZACCHI
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Patent number: 8729288Abstract: A method for the production of 2-hydroxy-4-(methylthio)butyronitrile having good storage stability in a multi-zone reactor, is provided. 3-methylmercaptopropionaldehyde is reacted with hydrogen cyanide in the presence of a base as catalyst in a main reaction zone of the multizone reactor to form a reaction mixture comprising the 2-hydroxy-4-(methylthio)butyronitrile, unreacted 3-methylmercaptopropionaldehyde, the catalyst and residual amounts of gaseous hydrogen cyanide. The residual gaseous hydrogen cyanide is removed from the main reaction zone to an absorption and post-reaction zone of the reactor which comprises a mixture of 3-methylmercaptopropionaldehyde and the catalyst; and the gaseous hydrogen cyanide is further reacted with the 3-methylmercaptopropionaldehyde in the absorption and post reaction zone. A molar ratio of hydrogen cyanide to 3-(methylthio)propanal in the main reaction zone is from 0.98 to 1.03.Type: GrantFiled: February 22, 2012Date of Patent: May 20, 2014Assignee: Evonik Degussa GmbHInventors: Dieter Buss, Martin Steurenthaler, Michael R. Rinner, Stephan Kretz, Hans Joachim Hasselbach, Caspar-Heinrich Finkeldei, Martin Koerfer, Pablo Zacchi
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Patent number: 8546601Abstract: A storage stable mixture containing 86 to 97% by weight of 2-hydroxy-4-methylthiobutyronitrile, 2 to 14% by weight of water, 0.05 to 0.5% by weight of HCN and having a pH of 1 to 4, measured using a pH electrode at 23° C. is provided. A method to produce the storage stable mixture and its use in manufacture of DL-methionine or 2-hydroxy-4-methylthiobutyric acid is also provided.Type: GrantFiled: February 22, 2012Date of Patent: October 1, 2013Assignee: Evonik Degussa GmbHInventors: Dieter Buss, Martin Steurenthaler, Joachim Hans Hasselbach, Michael R. Rinner, Benjamin Fonfe, Martin Koerfer, Stephan Kretz
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Publication number: 20120215022Abstract: A method for the production of 2-hydroxy-4-(methylthio)butyronitrile having good storage stability in a multi-zone reactor, is provided. 3-methylmercaptopropionaldehyde is reacted with hydrogen cyanide in the presence of a base as catalyst in a main reaction zone of the multizone reactor to form a reaction mixture comprising the 2-hydroxy-4-(methylthio)butyronitrile, unreacted 3-methylmercaptopropionaldehyde, the catalyst and residual amounts of gaseous hydrogen cyanide. The residual gaseous hydrogen cyanide is removed from the main reaction zone to an absorption and post-reaction zone of the reactor which comprises a mixture of 3-methylmercaptopropionaldehyde and the catalyst; and the gaseous hydrogen cyanide is further reacted with the 3-methylmercaptopropionaldehyde in the absorption and post reaction zone. A molar ratio of hydrogen cyanide to 3-(methylthio)propanal in the main reaction zone is from 0.98 to 1.03.Type: ApplicationFiled: February 22, 2012Publication date: August 23, 2012Applicant: Evonik Degussa GmbHInventors: Dieter Buss, Martin Steurenthaler, Michael R. Rinner, Stephan Kretz, Hans Joachim Hasselbach, Caspar-Heinrich Finkeldei, Martin Koerfer, Pablo Zacchi
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Publication number: 20120215021Abstract: A storage stable mixture containing 86 to 97% by weight of 2-hydroxy-4-methylthiobutyronitrile, 2 to 14% by weight of water, 0.05 to 0.5% by weight of HCN and having a pH of 1 to 4, measured using a pH electrode at 23° C. is provided. A method to produce the storage stable mixture and its use in manufacture of DL-methionine or 2-hydroxy-4-methylthiobutyric acid is also provided.Type: ApplicationFiled: February 22, 2012Publication date: August 23, 2012Applicant: Evonik Degussa GmbHInventors: Dieter Buss, Martin Steurenthaler, Hans Joachim Hasselbach, Michael R. Rinner, Benjamin Fonfe, Martin Koerfer, Stephan Kretz
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Publication number: 20110257429Abstract: The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.Type: ApplicationFiled: February 1, 2010Publication date: October 20, 2011Applicant: Evonik Degussa GmbHInventors: Alexander Schraven, Thomas Tacke, Thomas Haas, Christoph Kobler, Dieter Buss, Axel Ronneburg, Olivier Zehnacker
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Publication number: 20100210871Abstract: The invention relates to a process for converting ammonium salts of organic acids to the particular free organic acid, wherein an aqueous solution of the ammonium salt is contacted with an organic extractant and the salt is dissociated at temperatures and pressures at which the aqueous solution and the extractant are in the liquid state, and a stripping medium or entraining gas is introduced in order to remove NH3 from the aqueous solution and transfer at least a portion of the free organic acid formed to the organic extractant. The invention described here thus provides an improved process for releasing an organic acid, preferably a carboxylic, sulphonic or phosphonic acid, especially an alpha-hydroxycarboxylic acid or beta-hydroxycarboxylic acid, from the ammonium salt thereof by release and removal of ammonia and simultaneous extraction of the acid released with a suitable extractant from the aqueous phase. This process corresponds to a reactive extraction.Type: ApplicationFiled: February 16, 2010Publication date: August 19, 2010Applicant: EVONIK DEGUSSA GMBHInventors: Christoph Kobler, Dieter Buss, Axel Ronneburg, Christoph Weckbecker
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Patent number: 7572937Abstract: The present invention relates to a sequence for the preparation of amino acids, for example alpha amino acids, in particular methionine, by making use of an amidocarbonylation reaction and reuse of the catalyst.Type: GrantFiled: May 14, 2005Date of Patent: August 11, 2009Assignee: Evonik Degussa GmbHInventors: Martin Hateley, Thomas Hauhlner, Christoph Weckbecker, Klaus Huthmacher, Dieter Buss
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Patent number: 7439390Abstract: The present invention relates to a sequence for the preparation of amino acids, for example alpha-amino acids, in particular methionine, by making use of an amidocarbonylation reaction in the presence of a cobalt carbonyl catalyst and separating the catalyst in the form of a Co(N-amino acid)2 compound.Type: GrantFiled: May 14, 2005Date of Patent: October 21, 2008Assignee: Degussa AGInventors: Martin Hateley, Thomas Häussner, Christoph Weckbecker, Klaus Huthmacher, Dieter Buss
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Publication number: 20080009649Abstract: The present invention relates to a sequence for the preparation of amino acids, for example alpha-amino acids, in particular methionine, by making use of an amidocarbonylation reaction in the presence of a cobalt carbonyl catalyst and separating the catalyst in the form of a Co(N-amino acid)2 compound.Type: ApplicationFiled: May 14, 2005Publication date: January 10, 2008Inventors: Martin Hateley, Thomas Haussner, Christoph Weckbecker, Klaus Huthmacher, Dieter Buss
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Publication number: 20070244339Abstract: The present invention relates to a sequence for the preparation of amino acids, for example alpha-amino acids, in particular methionine, by making use of an amidocarbonylation reaction and reuse of the catalyst.Type: ApplicationFiled: May 14, 2005Publication date: October 18, 2007Inventors: Martin Hateley, Thomas Haussner, Christoph Weckbecker, Klaus Huthmacher, Dieter Buss
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Patent number: 7119228Abstract: The present invention is directed to an improved process for producing methionine in which the by-product methionyl-methionine is quickly converted to the product methionine by a hydrolysis reaction. The process is performed at high temperatures (200° C. to 280° C.) and short residence times (20 s to 200 s) and results in an improved yield of end product methionine.Type: GrantFiled: February 10, 2005Date of Patent: October 10, 2006Assignee: Degussa AGInventors: Dieter Buss, Ron Stockfleth, Martin Körfer, Jürgen Stock, Ralf Goedecke, Hans-Joachim Hasselbach, Gundolf Hornung
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Publication number: 20050267314Abstract: The present invention is directed to an improved process for producing methionine in which the by-product methionyl-methionine is quickly converted to the product methionine by a hydrolysis reaction. The process is performed at high temperatures (200° C. to 280° C.) and short residence times (20 s to 200 s) and results in an improved yield of end product methionine.Type: ApplicationFiled: February 10, 2005Publication date: December 1, 2005Inventors: Dieter Buss, Ron Stockfleth, Martin Korfer, Jurgen Stock, Ralf Goedecke, Hans-Joachim Hasselbach, Gundolf Hornung
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Publication number: 20050192460Abstract: The invention provides a process for preparing amino acid esters and/or their acid addition salts from monomeric or polymeric amino acids, peptides, proteins and alcohols, which comprises carrying out the reaction in supercritical alcohols, preferably at pressures and temperatures which are at least 5% above the critical parameters, the alcohols serving both as the solvent and as reactants.Type: ApplicationFiled: February 18, 2005Publication date: September 1, 2005Applicant: Goldschmidt GmbHInventors: Matthias Pascaly, Dietrich Maass, Dieter Buss, Burghard Gruning, Gunter Latoschinski, Tim Popken, Christian Weitemeyer
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Patent number: 6797827Abstract: A process for the preparation of &agr;-amino acids by hydrolysis of hydantoins in the presence of water and at least one metallic oxide under conditions such that all the starting materials are completely dissolved in the water as a result of high pressure and high temperature and only one further phase is present in the reactor in addition to the metallic oxide phase.Type: GrantFiled: July 30, 2003Date of Patent: September 28, 2004Assignee: Degussa AGInventors: Martin Körfer, Dieter Buss, Horst Weigel, Christoph Weckbecker, Hans Joachim Hasselbach, Klaus Huthmacher
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Publication number: 20040039228Abstract: A process for the preparation of &agr;-amino acids by hydrolysis of hydantoins in the presence of water and at least one metallic oxide under conditions such that all the starting materials are completely dissolved in the water as a result of high pressure and high temperature and only one further phase is present in the reactor in addition to the metallic oxide phase.Type: ApplicationFiled: July 30, 2003Publication date: February 26, 2004Inventors: Martin Korfer, Dieter Buss, Horst Weigel, Christoph Weckbecker, Hans Joachim Hasselbach, Klaus Huthmacher