Patents by Inventor Chiu Kee Cheung
Chiu Kee Cheung 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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Publication number: 20230278951Abstract: A process for preparing 3-methylthiopropionaldehyde, by a) providing a liquid stream with methyl mercaptan and/or the hemi thioacetal formed from 3-methylthiopropionaldehyde and methyl mercaptan; b) providing an acrolein with a vapor stream, where the major part of the vapor stream is acrolein, and the pressure of the vapor stream is lower than atmospheric pressure; c) introducing the liquid stream with methyl mercaptan and/or the hemi thioacetal formed from 3-methylthiopropionaldehyde and methyl mercaptan of a) and the acrolein with a vapor stream of b) into a reaction unit with a vapor-liquid mixing device, and d) reacting acrolein with methyl mercaptan and/or the hemi thioacetal formed from 3-methylthiopropionaldehyde and methyl mercaptan in the reaction unit of c) to give a 3-metyhlthiopropionaldehyde product mixture.Type: ApplicationFiled: July 6, 2021Publication date: September 7, 2023Applicant: Evonik Operations GmbHInventors: Stephan RAUTENBERG (Deceased), Thorsten MERKER, Michael EICKER, Bruno KRUDEWIG, Haohao ZHU, Chiu Kee CHEUNG
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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: 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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Patent number: 9649615Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.Type: GrantFiled: May 31, 2013Date of Patent: May 16, 2017Assignee: EVONIK DEGUSSA GmbHInventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Koerfer
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Patent number: 9630843Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.Type: GrantFiled: May 31, 2013Date of Patent: April 25, 2017Assignee: EVONIK DEGUSSA GmbHInventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Geert Van Eester, Stefan Wenner, Martin Koerfer
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Patent number: 9440208Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2SX content.Type: GrantFiled: May 31, 2013Date of Patent: September 13, 2016Assignee: EVONIK DEGUSSA GmbHInventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Koerfer
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Patent number: 9421511Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.Type: GrantFiled: May 31, 2013Date of Patent: August 23, 2016Assignee: Evonik Degussa GmbHInventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Koerfer
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Publication number: 20150209747Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.Type: ApplicationFiled: May 31, 2013Publication date: July 30, 2015Applicant: EVONIK INDUSTRIES AGInventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Körfer
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Publication number: 20150190775Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.Type: ApplicationFiled: May 31, 2013Publication date: July 9, 2015Applicant: Evonik Industries AGInventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Körfer
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Publication number: 20150175419Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.Type: ApplicationFiled: May 31, 2013Publication date: June 25, 2015Applicant: EVONIK INDUSTRIES AGInventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Geert Van Eester, Stefan Wenner, Martin Koerfer
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Publication number: 20150151271Abstract: The present invention relates to a reactor and to a process for synthesis of hydrogen sulphide from elemental sulphur and hydrogen at elevated pressure and elevated temperature. The invention further relates to the use of the reactor for preparation of hydrogen sulphide in high yield and with a low H2Sx content.Type: ApplicationFiled: May 31, 2013Publication date: June 4, 2015Applicant: Evonik Industries AGInventors: Caspar-Heinrich Finkeldei, Chiu Kee Cheung, Ralf Maassen, Stefan Wenner, Martin Koerfer