Patents by Inventor Benjamin Fonfe
Benjamin Fonfe 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: 10703715Abstract: The present invention relates to a process for the preparation of an alkanesulfonic acid by oxidation of a sulfur containing starting compound with an oxygen containing fluid, wherein the sulfur containing starting compound is provided in a reaction system, comprising a reaction vessel (1) with an expansion vessel (2) on its top, wherein the reaction vessel and the expansion vessel are connected to allow a flow of a fluid stream from the reaction vessel into the expansion vessel.Type: GrantFiled: September 5, 2018Date of Patent: July 7, 2020Assignee: Evonik Operations GmbHInventors: Benjamin Fonfe, Chiu Kee Cheung, Ali Hartwig
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Patent number: 10494331Abstract: The present invention relates to a process for operating a plant for preparing an alkanesulfonic acid, wherein said alkanesulfonic acid is prepared by oxidation of an alkylmercaptan, dialkydisulfide and/or dialkylpolysulfide and the one or more alkyl radicals of the alkylmercaptan, dialkydisulfide and/or dialkylpolysulfide are identical with the alkyl radical of the alkylsulfonic acid to be prepared, characterized in that the oxidation is performed in the presence of an at least stoichiometric amount of an oxoacid of nitrogen, e.g.Type: GrantFiled: September 12, 2018Date of Patent: December 3, 2019Assignee: Evonik Degussa GmbHInventors: Benjamin Fonfe, Chiu Kee Cheung, Ali Hartwig, Nadine Duerr
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Patent number: 10422778Abstract: A method for determining dimethyl disulphide proceeds by carrying out a chromatographic separation of an analyte containing at least dimethyl disulphide and methanesulphonic acid, and determining the dimethyl disulphide by pulsed amperometric detection.Type: GrantFiled: December 17, 2015Date of Patent: September 24, 2019Assignee: Evonik Degussa GmbHInventors: Harald Jakob, Benjamin Fonfe, Sebastian Fuss, Andreas Doerflein, Markus Held, Nadine Duerr
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Patent number: 10399934Abstract: The present invention relates to a process for preparing alkanesulphonic acid by oxidizing an alkyl mercaptan, a dialkyl disulphide and/or a dialkyl polysulphide having three to nine sulphur atoms with an oxidizing agent, wherein additional oxidizing agent is fed into the oxidation if as yet unoxidized alkyl mercaptan and/or unoxidized dialkyl disulphide and/or at least one intermediate from the oxidation of the dialkyl disulphide and/or of the dialkyl polysulphide is present in the reaction output, and a corresponding apparatus for performance of oxidation reactions.Type: GrantFiled: November 30, 2016Date of Patent: September 3, 2019Assignee: Evonik Degussa GmbHInventors: Benjamin Fonfe, Nadine Duerr, Harald Jakob, Chiu Kee Cheung, Andreas Doerflein, Sebastian Fuss
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Publication number: 20190077748Abstract: The present invention relates to a process for operating a plant for preparing an alkanesulfonic acid, wherein said alkanesulfonic acid is prepared by oxidation of an alkylmercaptan, dialkydisulfide and/or dialkylpolysulfide and the one or more alkyl radicals of the alkylmercaptan, dialkydisulfide and/or dialkylpolysulfide are identical with the alkyl radical of the alkylsulfonic acid to be prepared, characterized in that the oxidation is performed in the presence of an at least stoichiometric amount of an oxoacid of nitrogen, e.g.Type: ApplicationFiled: September 12, 2018Publication date: March 14, 2019Applicant: Evonik Degussa GmbHInventors: Benjamin Fonfe, Chiu Kee Cheung, Ali Hartwig, Nadine Duerr
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Publication number: 20190071394Abstract: The present invention relates to a process for the preparation of an alkanesulfonic acid by oxidation of a sulfur containing starting compound with an oxygen containing fluid, wherein the sulfur containing starting compound is provided in a reaction system, comprising a reaction vessel (1) with an expansion vessel (2) on its top, wherein the reaction vessel and the expansion vessel are connected to allow a flow of a fluid stream from the reaction vessel into the expansion vessel.Type: ApplicationFiled: September 5, 2018Publication date: March 7, 2019Applicant: Evonik Degussa GmbHInventors: Benjamin FONFE, Chiu Kee CHEUNG, Ali HARTWIG
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Publication number: 20180354897Abstract: The present invention relates to a process for preparing alkanesulphonic acid by oxidizing an alkyl mercaptan, a dialkyl disulphide and/or a dialkyl polysulphide having three to nine sulphur atoms with an oxidizing agent, wherein additional oxidizing agentis fed into the oxidation if as yet unoxidized alkyl mercaptan and/or unoxidized dialkyl disulphide and/or at least one intermediate from the oxidation of the dialkyl disulphide and/or of the dialkyl polysulphide is present in the reaction output, and a corresponding apparatus for performance of oxidation reactions.Type: ApplicationFiled: November 30, 2016Publication date: December 13, 2018Applicant: Evonik Degussa GmbHInventors: Benjamin FONFE, Nadine DUERR, Harald JAKOB, Chiu Kee CHEUNG, Andreas DOERFLEIN, Sebastian FUSS
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Publication number: 20180267002Abstract: A method for determining dimethyl disulphide proceeds by carrying out a chromatographic separation of an analyte containing at least dimethyl disulphide and methanesulphonic acid, and determining the dimethyl disulphide by pulsed amperometric detection.Type: ApplicationFiled: December 17, 2015Publication date: September 20, 2018Applicant: Evonik Degussa GmbHInventors: Harald JAKOB, Benjamin Fonfe, Sebastian Fuss, Andreas Doerflein, Markus Held, Nadine Duerr
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Patent number: 10052620Abstract: The present invention relates to a catalyst for oxidation reactions, particularly for oxidation of mercaptan dialkyldisulfides and/or dialklypolysulfides with oxygen to alkanesulfonic acids.Type: GrantFiled: December 4, 2014Date of Patent: August 21, 2018Assignee: EVONIK DEGUSSA GmbHInventors: Chuanhua He, Benjamin Fonfe, Harald Jakob, Xiangyu Yang
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Patent number: 10023531Abstract: The present invention relates to a process for preparing alkanesulfonic acids from dialkyl disulfides with nitric acid and oxygen.Type: GrantFiled: December 10, 2014Date of Patent: July 17, 2018Assignee: EVONIK DEGUSSA GmbHInventors: Benjamin Fonfe, Harald Jakob, Chuanhua He, Andreas Doerflein, Sebastian Fuss
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Publication number: 20180133704Abstract: The present invention relates to a catalyst for oxidation reactions, particularly for oxidation of mercaptan dialkyldisulfides and/or dialklypolysulfides with oxygen to alkanesulfonic acids.Type: ApplicationFiled: December 4, 2014Publication date: May 17, 2018Applicant: EVONIK DEGUSSA GMBHInventors: Chuanhua HE, Benjamin FONFE, Harald JAKOB, Xiangyu YANG
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Patent number: 9809535Abstract: An alkyl mercaptan is prepared by reacting an aliphatic alcohol with hydrogen sulfide in the presence of a heterogeneous catalyst at varying temperatures.Type: GrantFiled: December 18, 2015Date of Patent: November 7, 2017Assignee: Evonik Degussa GmbHInventors: Benjamin Fonfe, Stephan Kretz, Harald Jakob
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Patent number: 9764309Abstract: The present invention relates to a catalyst which comprises a support material and an oxidic composition containing at least one alkali metal and tungsten, a process for producing such catalysts and also a process for preparing alkyl mercaptans by reaction of alkanols with hydrogen sulphide in the presence of such a catalyst.Type: GrantFiled: November 27, 2012Date of Patent: September 19, 2017Assignee: EVONIK DEGUSSA GmbHInventors: Benjamin Fonfe, Sebastian Fuss, Frank Wilz, Harald Jakob, Christoph Weckbecker
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Publication number: 20160304446Abstract: The present invention relates to a process for preparing alkanesulfonic acids from dialkyl disulfides with nitric acid and oxygen.Type: ApplicationFiled: December 10, 2014Publication date: October 20, 2016Applicant: EVONIK DEGUSSA GMBHInventors: Benjamin FONFE, Harald JAKOB, Chuanhua HE, Andreas DOERFLEIN, Sebastian FUSS
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Publication number: 20160176808Abstract: An alkyl mercaptan is prepared by reacting an aliphatic alcohol with hydrogen sulfide in the presence of a heterogeneous catalyst at varying temperatures.Type: ApplicationFiled: December 18, 2015Publication date: June 23, 2016Applicant: Evonik Degussa GmbHInventors: Benjamin FONFE, Stephan KRETZ, Harald JAKOB
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Publication number: 20140357897Abstract: The present invention relates to a catalyst which comprises a support material and an oxidic composition containing at least one alkali metal and tungsten, a process for producing such catalysts and also a process for preparing alkyl mercaptans by reaction of alkanols with hydrogen sulphide in the presence of such a catalyst.Type: ApplicationFiled: November 27, 2012Publication date: December 4, 2014Applicant: Evonik Degussa GmbHInventors: Benjamin Fonfe, Sebastian Fuss, Frank Wilz, Harald Jakob, Christoph Weckbecker
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Patent number: 8759592Abstract: A process for preparing methylmercaptopropionaldehyde in a single reaction unit, is provided. According to the preferred embodiment, the process comprises, simultaneously contacting a gaseous mixture comprising acrolein with a liquid mixture comprising methylmercaptopropionaldehyde, methyl mercaptan, a catalyst and methylmercaptopropionaldehyde methyl thiohemiacetal in the reactive absorber; absorbing the acrolein from the gaseous mixture into the liquid mixture; reacting the absorbed acrolein with the methyl mercaptan or the methylmercaptopropionaldehyde methyl thiohemiacetal to obtain methylmercapto-propionaldehyde; removing gaseous impurities and by-products from the liquid mixture; and separating the obtained methylmercaptopropionaldehyde product from the reactive absorber, directing a portion of the separated product to storage or further processing and recycling the remaining portion to the reactive absorber; wherein the methyl mercaptan optionally comprises dimethyl sulfide or dimethyl ether.Type: GrantFiled: October 30, 2013Date of Patent: June 24, 2014Assignee: Evonik Degussa GmbHInventors: Caspar Heinrich Finkeldei, Pablo Zacchi, Benjamin Fonfe, Stephan Kretz, Martin Koerfer, Hans Joachim Hasselbach, Wolfgang Boeck
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Publication number: 20140051890Abstract: A process for preparing methylmercaptopropionaldehyde in a single reaction unit, is provided. According to the preferred embodiment, the process comprises, simultaneously contacting a gaseous mixture comprising acrolein with a liquid mixture comprising methylmercaptopropionaldehyde, methyl mercaptan, a catalyst and methylmercaptopropionaldehyde methyl thiohemiacetal in the reactive absorber; absorbing the acrolein from the gaseous mixture into the liquid mixture; reacting the absorbed acrolein with the methyl mercaptan or the methylmercaptopropionaldehyde methyl thiohemiacetal to obtain methylmercapto-propionaldehyde; removing gaseous impurities and by-products from the liquid mixture; and separating the obtained methylmercaptopropionaldehyde product from the reactive absorber, directing a portion of the separated product to storage or further processing and recycling the remaining portion to the reactive absorber; wherein the methyl mercaptan optionally comprises dimethyl sulfide or dimethyl ether.Type: ApplicationFiled: October 30, 2013Publication date: February 20, 2014Applicant: EVONIK DEGUSSA GmbHInventors: Caspar Heinrich FINKELDEI, Pablo Zacchi, Benjamin Fonfe, Stephan Kretz, Martin Koerfer, Hans Joachim Hasselbach, Wolfgang Boeck
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Patent number: 8624066Abstract: A process for preparing methylmercaptopropionaldehyde in a single reaction unit, is provided. According to the preferred embodiment, the process comprises, simultaneously contacting a gaseous mixture comprising acrolein with a liquid mixture comprising methylmercaptopropionaldehyde, methyl mercaptan, a catalyst and methylmercaptopropionaldehyde methyl thiohemiacetal in the reactive absorber; absorbing the acrolein from the gaseous mixture into the liquid mixture; reacting the absorbed acrolein with the methyl mercaptan or the methylmercaptopropionaldehyde methyl thiohemiacetal to obtain methylmercapto-propionaldehyde; removing gaseous impurities and by-products from the liquid mixture; and separating the obtained methylmercaptopropionaldehyde product from the reactive absorber, directing a portion of the separated product to storage or further processing and recycling the remaining portion to the reactive absorber; wherein the methyl mercaptan optionally comprises dimethyl sulfide or dimethyl ether.Type: GrantFiled: December 27, 2011Date of Patent: January 7, 2014Assignee: Evonik Degussa GmbHInventors: Caspar Heinrich Finkeldei, Pablo Zacchi, Benjamin Fonfe, Stephan Kretz, Martin Koerfer, Hans Joachim Hasselbach, Wolfgang Boeck
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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