Patents by Inventor Kiyohito Asaumi
Kiyohito Asaumi 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: 9828684Abstract: Provided is a cell for ion exchange membrane electrolysis obtained by improving the performance in electrolysis of an existing bipolar cell for ion exchange membrane electrolysis, in which a cathode partition wall and a rigid cathode being connected together by a plurality of intermediating V-shaped springs, by a simple method. It is a cell for ion exchange membrane electrolysis which is separated by an ion exchange membrane (7) into an anode chamber (1) having a rigid anode (1a) and an anode partition wall (1b) and a cathode chamber (2) having a rigid cathode (2a) and a cathode partition wall (2b), the rigid cathode (2a) and the cathode partition wall (2b) being connected together by a plurality of intermediating V-shaped springs (3).Type: GrantFiled: April 23, 2013Date of Patent: November 28, 2017Assignee: thyssenkrupp Uhde Chlorine Engineers (Japan) Ltd.Inventors: Kiyohito Asaumi, Koichi Hirashima, Zhengkan Huang, Mitsumasa Okamoto, Koji Yoshimura
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Patent number: 9315908Abstract: There is provided a method of production of chlorine.sodium hydroxide capable of being operated stably and economically by preventing calcium from being deposited in an ion exchange membrane. The liquid retention layer 3 having a liquid retention amount per unit volume of the liquid retention layer of 0.10 g-H2O/cm3 or more and 0.80 g-H2O/cm3 or less is put between the ion exchange membrane 12 and the gas diffusion electrode 16. Calcium ions transferred through the ion exchange membrane 12 easily diffuse, thereby making it possible to suppress increase in an electrolytic voltage and drop in current efficiency generated by deposition of the calcium ions inside the ion exchange membrane 12.Type: GrantFiled: October 1, 2010Date of Patent: April 19, 2016Assignees: CHLORINE ENGINEERS CORP., KANEKA CORPORATION, TOAGOSEI CO., LTD.Inventors: Tomonori Idutsu, Koji Saiki, Yukinori Iguchi, Kiyohito Asaumi
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Patent number: 9181624Abstract: Disclosed is an electrolysis method, whereby sodium chloride concentration of an aqueous caustic soda solution formed through electrolysis in a two-chamber ion-exchange membrane sodium chloride electrolytic cell, which is equipped with a gas diffusion electrode as a cathode and divided into an anode chamber containing an anode and a cathode gas chamber containing the cathode that are partitioned by an ion-exchange membrane, is lowered. In a two-chamber ion-exchange membrane electrolytic cell (1) using a gas diffusion electrode (7), electrolysis is performed while reducing the pressure difference between the liquid pressure in the anode chamber and the gas pressure in the cathode gas chamber, i.e.Type: GrantFiled: April 15, 2010Date of Patent: November 10, 2015Assignees: CHLORINE ENGINEERS CORP., LTD., KANEKA CORPORATION, TOAGOSEI CO., LTD.Inventors: Mikihito Sugiyama, Yukinori Iguchi, Kiyohito Asaumi
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Publication number: 20150114830Abstract: Provided is a cell for ion exchange membrane electrolysis obtained by improving the performance in electrolysis of an existing bipolar cell for ion exchange membrane electrolysis, in which a cathode partition wall and a rigid cathode being connected together by a plurality of intermediating V-shaped springs, by a simple method. It is a cell for ion exchange membrane electrolysis which is separated by an ion exchange membrane (7) into an anode chamber (1) having a rigid anode (1a) and an anode partition wall (1b) and a cathode chamber (2) having a rigid cathode (2a) and a cathode partition wall (2b), the rigid cathode (2a) and the cathode partition wall (2b) being connected together by a plurality of intermediating V-shaped springs (3).Type: ApplicationFiled: April 23, 2013Publication date: April 30, 2015Applicant: CHLORINE ENGINEERS CORP., LTD.Inventors: Kiyohito Asaumi, Koichi Hirashima, Zhengkan Huang, Mitsumasa Okamoto, Koji Yoshimura
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Patent number: 8940139Abstract: Provided is a gas diffusion electrode equipped ion exchange membrane electrolyzer including an anode, an ion exchange membrane, and a cathode chamber in which a gas diffusion electrode is disposed, wherein the ion exchange membrane and a cathode chamber inner space in which the gas diffusion electrode is disposed are separated by a liquid retaining member, the outer periphery of the liquid retaining member is held in a void formed in a gasket or a cathode chamber frame constituting the cathode chamber, or the outer periphery and the end face of the outer periphery of the liquid retaining member are sealed, or the outer periphery of the liquid retaining member is joined to and integrated with the gasket.Type: GrantFiled: May 24, 2010Date of Patent: January 27, 2015Assignees: Chlorine Engineers Corp., Ltd., Toagosei Co., Ltd., Kaneka CorporationInventors: Kiyohito Asaumi, Yukinori Iguchi, Mitsuharu Hamamori, Tomonori Izutsu
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Publication number: 20130153433Abstract: There is provided a method of production of chlorine.sodium hydroxide capable of being operated stably and economically by preventing calcium from being deposited in an ion exchange membrane. The liquid retention layer 3 having a liquid retention amount per unit volume of the liquid retention layer of 0.10 g-H2O/cm3 or more and 0.80 g-H2O/cm3 or less is put between the ion exchange membrane 12 and the gas diffusion electrode 16. Calcium ions transferred through the ion exchange membrane 12 easily diffuse, thereby making it possible to suppress increase in an electrolytic voltage and drop in current efficiency generated by deposition of the calcium ions inside the ion exchange membrane 12.Type: ApplicationFiled: October 1, 2010Publication date: June 20, 2013Inventors: Tomonori Idutsu, Koji Saiki, Yukinori Iguchi, Kiyohito Asaumi
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Publication number: 20120145559Abstract: Provided is a gas diffusion electrode equipped ion exchange membrane electrolyzer including an anode, an ion exchange membrane, and a cathode chamber in which a gas diffusion electrode is disposed, wherein the ion exchange membrane and a cathode chamber inner space in which the gas diffusion electrode is disposed are separated by a liquid retaining member, the outer periphery of the liquid retaining member is held in a void formed in a gasket or a cathode chamber frame constituting the cathode chamber, or the outer periphery and the end face of the outer periphery of the liquid retaining member are sealed, or the outer periphery of the liquid retaining member is joined to and integrated with the gasket.Type: ApplicationFiled: May 24, 2010Publication date: June 14, 2012Applicants: CHLORINE ENGINEERS CORP., LTD., KANEKA CORPORATION, TOAGOSEI CO., LTD.Inventors: Kiyohito Asaumi, Yukinori Iguchi, Mitsuharu Hamamori, Tomonori Izutsu
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Patent number: 8197649Abstract: [Problems] The liquid pressure of an anode chamber in a two-chamber ion exchange membrane electrolytic cell using a gas diffusion electrode are different among one another depending on depths so that the liquid pressures are applied on an anode or an ion exchange membrane, thereby introducing damage or deformation of the elements. [Means for Solving] A cushion material 10 is accommodated between a cathode gas chamber back plate 9 and a gas diffusion electrode 7 of an ion exchange membrane electrolytic cell 1 such that a repulsive force of the cushion material at the bottom part of the cathode gas chamber is larger than that at the top part. The excessive pressure applied to an ion exchange membrane is suppressed to prevent the generation of scratches or the like by decreasing the repulsive force of the cushion material toward the top in accordance with a differential pressure between an anode chamber pressure and a cathode gas chamber pressure.Type: GrantFiled: May 17, 2006Date of Patent: June 12, 2012Assignees: Chlorine Engineers Corp., Ltd., Kaneka Corporation, Toagosei Co., Ltd.Inventors: Koji Saiki, Kiyohito Asaumi, Mitsuharu Hamamori, Tsugiyoshi Osakabe
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Publication number: 20120125782Abstract: Provided is a gas diffusion electrode equipped ion exchange membrane electrolyzer including an anode, an ion-exchange membrane, and a cathode chamber in which a gas diffusion electrode is disposed, wherein in a cathode gas chamber formed between a back plate of the cathode chamber and one side of the gas diffusion electrode opposite to the electrolytic surface, a gas-permeable elastic member is disposed between the gas diffusion electrode and the back plate, and the elastic member forms a conductive connection between the gas diffusion electrode and the back plate by making contact with corrosion-resistant conductive layers formed on the surfaces of a plurality of conductive members which are joined to the back plate.Type: ApplicationFiled: May 24, 2010Publication date: May 24, 2012Applicants: CHLORINE ENGINEERS CORP., LTD., KANEKA CORPORATION, TOAGOSEI CO. LTD.Inventors: Kiyohito Asaumi, Yukinori Iguchi, Mitsuharu Hamamori
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Publication number: 20120048743Abstract: Disclosed is an electrolysis method, whereby sodium chloride concentration of an aqueous caustic soda solution formed through electrolysis in a two-chamber ion-exchange membrane sodium chloride electrolytic cell, which is equipped with a gas diffusion electrode as a cathode and divided into an anode chamber containing an anode and a cathode gas chamber containing the cathode that are partitioned by an ion-exchange membrane, is lowered. In a two-chamber ion-exchange membrane electrolytic cell (1) using a gas diffusion electrode (7), electrolysis is performed while reducing the pressure difference between the liquid pressure in the anode chamber and the gas pressure in the cathode gas chamber, i.e.Type: ApplicationFiled: April 15, 2010Publication date: March 1, 2012Applicants: CHLORINE ENGINEERS CORP., LTD, TOAGOSEI CO., LTD, KANEKA CORPORATIONInventors: Mikihito Sugiyama, Yukinori Iguchi, Kiyohito Asaumi
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Patent number: 7754058Abstract: An ion exchange membrane electrolyzer comprises electrodes at least either of which is held in contact with leaf springs formed integrally with a leaf spring holding member arranged in an electrode chamber so as to extend toward the electrode and remain electrically energized at the respective electrode touching sections thereof, each of the leaf springs having a crooked section arranged at a position separated from its connecting section connecting itself to the leaf spring holding member and adapted to be bent toward the leaf spring holding member when the electrode touching section is pressed toward the leaf spring holding member side.Type: GrantFiled: June 4, 2007Date of Patent: July 13, 2010Assignee: Chlorine Engineers Corp., Ltd.Inventor: Kiyohito Asaumi
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Patent number: 7569083Abstract: In a gas diffusion electrode assembly, and in an electrolyzer using the same, a bonding piece having on at least one surface a perfluorosulfonic acid layer, a perfluorosulfonyl fluoride layer or an alkyl ester of perfluorocarboxylic acid layer is positioned at its perfluoro compound layer surface with respect to the gas diffusion electrode assembly. Adjacent gas diffusion electrodes are heat fusion bonded together, or heat fusion bonding is carried out using the bonding piece in a frame form. Adjacent gas diffusion electrodes are sealed up by heat fusion bonding, using a material that is similar to the material that forms the gas diffusion electrodes.Type: GrantFiled: July 1, 2008Date of Patent: August 4, 2009Assignees: Chlorine Engineers Corp. Ltd., Tosoh Corporation, Mitsui Chemicals, Inc., Toagosei Co., Ltd., Kaneka Corporation, Asahi Glass Company, Limited, Asahi Kasei Chemicals Corporation, Daiso Co., Ltd., Tokuyama CorporationInventors: Shinji Katayama, Kiyohito Asaumi, Hiroaki Aikawa, Tsugiyoshi Osakabe, Mitsuharu Hamamori, Tatsuhito Kimura, Koji Saiki, Kenji Nonomura, Naoya Okada, Osamu Ichinose
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Publication number: 20090071820Abstract: [Problems] The liquid pressure of an anode chamber in a two-chamber ion exchange membrane electrolytic cell using a gas diffusion electrode are different among one another depending on depths so that the liquid pressures are applied on an anode or an ion exchange membrane, thereby introducing damage or deformation of the elements. [Means for Solving] A cushion material 10 is accommodated between a cathode gas chamber back plate 9 and a gas diffusion electrode 7 of an ion exchange membrane electrolytic cell 1 such that a repulsive force of the cushion material at the bottom part of the cathode gas chamber is larger than that at the top part. The excessive pressure applied to an ion exchange membrane is suppressed to prevent the generation of scratches or the like by decreasing the repulsive force of the cushion material toward the top in accordance with a differential pressure between an anode chamber pressure and a cathode gas chamber pressure.Type: ApplicationFiled: May 17, 2006Publication date: March 19, 2009Inventors: Koji Saiki, Kiyohito Asaumi, Mitsuharu Hamamori, Tsugiyoshi Osakabe
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Publication number: 20080271847Abstract: In a gas diffusion electrode assembly, and in an electrolyzer using the same, a bonding piece having on at least one surface a perfluorosulfonic acid layer, a perfluorosulfonyl fluoride layer or an alkyl ester of perfluorocarboxylic acid layer is positioned at its perfluoro compound layer surface with respect to the gas diffusion electrode assembly. Adjacent gas diffusion electrodes are heat fusion bonded together, or heat fusion bonding is carried out using the bonding piece in a frame form. Adjacent gas diffusion electrodes are sealed up by heat fusion bonding, using a material that is similar to the material that forms the gas diffusion electrodes.Type: ApplicationFiled: July 1, 2008Publication date: November 6, 2008Applicants: CHLORINE ENGINEERS CORP., LTD., TOSOH CORPORATION, MITSUI CHEMICALS, INC., TOAGOSEI CO., LTD., KANEKA CORPORATION, ASAHI GLASS COMPANY, LIMITED, ASAHI KASEI CHEMICALS CORPORATION, DAISO CO., LTD., TOKUYAMA CORPORATIONInventors: Shinji Katayama, Kiyohito Asaumi, Hiroaki Aikawa, Tsugiyoshi Osakabe, Mitsuharu Hamamori, Tatsuhito Kimura, Koji Saiki, Kenji Nonomura, Naoya Okada, Osamu Ichinose
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Patent number: 7404878Abstract: In a gas diffusion electrode assembly, and in an electrolyzer using the same, a bonding piece having on at least one surface a perfluorosulfonic acid layer, a perfluorosulfonyl fluoride layer or an alkyl ester of perfluorocarboxylic acid layer is positioned at its perfluoro compound layer surface with respect to the gas diffusion electrode assembly. Adjacent gas diffusion electrodes are heat fusion bonded together, or heat fusion bonding is carried out using the bonding piece in a frame form. Adjacent gas diffusion electrodes are sealed up by heat fusion bonding, using a material that is similar to the material that forms the gas diffusion electrodes.Type: GrantFiled: March 30, 2004Date of Patent: July 29, 2008Assignees: Chlorine Engineers Corp., Ltd., Tosoh Corporation, Mitsui Chemicals, Inc., Toagosei Co., Ltd., Kaneka Corporation, Asahi Glass Company, Limited, Asahi Kasei Chemicals Corporation, Daiso Co., Ltd., Tokuyama CorporationInventors: Shinji Katayama, Kiyohito Asaumi, Hiroaki Aikawa, Tsugiyoshi Osakabe, Mitsuharu Hamamori, Tatsuhito Kimura, Koji Saiki, Kenji Nonomura, Naoya Okada, Osamu Ichinose
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Publication number: 20070278095Abstract: An ion exchange membrane electrolyzer comprises electrodes at least either of which is held in contact with leaf springs formed integrally with a leaf spring holding member arranged in an electrode chamber so as to extend toward the electrode and remain electrically energized at the respective electrode touching sections thereof, each of the leaf springs having a crooked section arranged at a position separated from its connecting section connecting itself to the leaf spring holding member and adapted to be bent toward the leaf spring holding member when the electrode touching section is pressed toward the leaf spring holding member side.Type: ApplicationFiled: June 4, 2007Publication date: December 6, 2007Applicant: CHLORINE ENGINEERS CORP., LTD.Inventor: Kiyohito Asaumi
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Patent number: 7303661Abstract: A metal coil or an elastic cushion formed by winding the metal coil around a corrosion-resistant frame is sandwiched between an electrode and an electrode collector or a cell wall or is used as an electrode. The elasticity of the metal coil or the elastic cushion enables the easy handling and the uniform contact between the electrode and another electrolysis element. The metal coil or the elastic cushion can be also used as an elastic cathode. The elasticity of the elastic cathode also enables the easy handling of the electrode itself and the uniform contact between the ion exchange membrane and the current collector.Type: GrantFiled: March 30, 2004Date of Patent: December 4, 2007Assignee: Chlorine Engineers Corp., Ltd.Inventors: Shinji Katayama, Kiyohito Asaumi
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Publication number: 20040256223Abstract: In a gas diffusion electrode assembly, and in an electrolyzer using the same, a bonding piece having on at least one surface a perfluorosulfonic acid layer, a perfluorosulfonyl fluoride layer or an alky ester of perfluorocarboxylic acid layer is positioned at its perfluoro compound layer surface with respect to the gas diffusion electrode assembly. Adjacent gas diffusion electrodes are heat fusion bonded together, or heat fusion bonding is carried out using the bonding piece in a frame form. Adjacent gas diffusion electrodes are sealed up by heat fusion bonding, using a material that is similar to the material that forms the gas diffusion electrodes.Type: ApplicationFiled: March 30, 2004Publication date: December 23, 2004Inventors: Shinji Katayama, Kiyohito Asaumi, Hiroaki Aikawa, Tsugiyoshi Osakabe, Mitsuharu Hamamori, Tatsuhito Kimura, Koji Saiki, Kenji Nonomura, Naoya Okada, Osamu Ichinose
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Publication number: 20040245104Abstract: In order to discharge current from a gas diffusion electrode in an electrolytic unit cell including a gas chamber, the gas diffusion electrode is electrically connected to the wall surface of the gas chamber having conductivity through an electric connecting element in partial contact with the gas diffusion electrodeType: ApplicationFiled: March 30, 2004Publication date: December 9, 2004Applicants: CHLORINE ENGINEERS CORP., LTD., MITSUI CHEMICALS, INC., TOAGOSEI CO., LTD., KANEKA CORPORATION, TOSOH CORPORATION, ASAHI GLASS COMPANY, LIMITED, ASAHI KASEI CHEMICALS CORPORATION, DAISO CO., LTD., TOKUYAMA CORPORATIONInventors: Hiroaki Aikawa, Tsugiyoshi Osakabe, Mitsuharu Hamamori, Shinji Katayama, Kiyohito Asaumi
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Publication number: 20040188245Abstract: A metal coil or an elastic cushion formed by winding the metal coil around a corrosion-resistant frame is sandwiched between an electrode and an electrode collector or a cell wall or is used as an electrode. The elasticity of the metal coil or the elastic cushion enables the easy handling and the uniform contact between the electrode and another electrolysis element. The metal coil or the elastic cushion can be also used as an elastic cathode. The elasticity of the elastic cathode also enables the easy handling of the electrode itself and the uniform contact between the ion exchange membrane and the current collector.Type: ApplicationFiled: March 30, 2004Publication date: September 30, 2004Applicant: CHLORINE ENGINEERS CORP., LTD.Inventors: Shinji Katayama, Kiyohito Asaumi