Patents Assigned to Permelec Electrode Ltd.
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Patent number: 10253422Abstract: An electrolysis method of preventing the voltage of an electrolytic bath from rising over time without halting electrolysis and an electrolysis device for executing the method are provided such that: in operation of a two-compartment electrolytic bath, which has a membrane partitioning an anode compartment from a cathode compartment and in which a sulfide ion-containing white liquor for use in a pulp production process is fed into the anode compartment while direct current is supplied to the electrolytic bath to produce polysulfide in the anode compartment through electrolysis, and a sulfide ion-containing white liquor for use in a pulp production process that contains at least one of a scale cleaning agent and a scale inhibitor is fed to the anode compartment.Type: GrantFiled: March 12, 2018Date of Patent: April 9, 2019Assignees: NIPPON PAPER INDUSTRIES CO., LTD., PERMELEC ELECTRODE LTD.Inventors: Kenichiro Suyama, Kazuhiro Kurosu, Masaaki Kato, Hideo Otsu
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Publication number: 20180195189Abstract: An electrolysis method of preventing the voltage of an electrolytic bath from rising over time without halting electrolysis and an electrolysis device for executing the method are provided such that: in operation of a two-compartment electrolytic bath, which has a membrane partitioning an anode compartment from a cathode compartment and in which a sulfide ion-containing white liquor for use in a pulp production process is fed into the anode compartment while direct current is supplied to the electrolytic bath to produce polysulfide in the anode compartment through electrolysis, and a sulfide ion-containing white liquor for use in a pulp production process that contains at least one of a scale cleaning agent and a scale inhibitor is fed to the anode compartment.Type: ApplicationFiled: March 12, 2018Publication date: July 12, 2018Applicants: NIPPON PAPER INDUSTRIES CO., LTD., PERMELEC ELECTRODE LTD.Inventors: KENICHIRO SUYAMA, KAZUHIRO KUROSU, MASAAKI KATO, HIDEO OTSU
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Patent number: 9951432Abstract: An electrolysis method of preventing the voltage of an electrolytic bath from rising over time without halting electrolysis and an electrolysis device for executing the method are provided such that: in operation of a two-compartment electrolytic bath, which has a membrane partitioning an anode compartment from a cathode compartment and in which a sulfide ion-containing white liquor for use in a pulp production process is fed into the anode compartment while direct current is supplied to the electrolytic bath to produce polysulfide in the anode compartment through electrolysis, and a sulfide ion-containing white liquor for use in a pulp production process that contains at least one of a scale cleaning agent and a scale inhibitor is fed to the anode compartment.Type: GrantFiled: September 30, 2013Date of Patent: April 24, 2018Assignees: NIPPON PAPER INDUSTRIES CO., LTD., PERMELEC ELECTRODE LTD.Inventors: Kenichiro Suyama, Kazuhiro Kurosu, Masaaki Kato, Hideo Otsu
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Patent number: 9175410Abstract: The current invention is to provide an oxygen gas diffusion cathode for brine electrolysis which reduces an initial electrolysis voltage and is excellent in the durability against short-circuit, and an electrolytic cell and an electrolytic method using the same. The oxygen gas diffusion cathode for brine electrolysis includes a gas diffusion layer 13 and a reaction layer 14 on one surface of an electro-conductive substrate 12, and an electro-conductive layer 15 on the opposite surface thereof. The present oxygen gas diffusion cathode reduces the resistance of the electro-conductive substrate 12 and supplies uniform current by mounting the electro-conductive layer 15.Type: GrantFiled: February 15, 2011Date of Patent: November 3, 2015Assignees: PERMELEC ELECTRODE LTD., KANEKA CORPORATION, TOAGOSEI CO., LTD., CHLORINE ENGINEERS CORP., LTD.Inventors: Yuki Izawa, Setsuro Ogata, Masaharu Uno, Masashi Tanaka
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Patent number: 9145642Abstract: A continuous cooking process making use of a digester, which includes therein, from a top toward a bottom of the digester, a top zone, an upper cooking zone, a lower cooking zone and a cooking/washing zone and also includes strainers provided at the bottom of the respective zones and wherein a cooking black liquor extracted from at least one of the strainers is discharged to outside a digestion system, a process for cooking a lignocellulose characterized by feeding, upstream of the top of the digester, a first cooking liquor containing an alkaline cooking liquor having a specified composition, feeding a second cooking liquor of an alkaline cooking liquor made mainly of sodium hydroxide to the upper cooking zone, and feeding a third cooking liquor of an alkaline cooking liquor similar to the second cooking liquor to the cooking/washing zone.Type: GrantFiled: May 18, 2010Date of Patent: September 29, 2015Assignees: NIPPON PAPER INDUSTRIES CO., LTD., PERMELEC ELECTRODE LTD.Inventors: Kazuhiro Kurosu, Keigo Watanabe, Takamichi Kishi
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Patent number: 9133556Abstract: The present invention aims to provide an activated cathode enabling a long-time stable operation with hydrogen overvoltage maintained at a low value, keeping a high remaining rate of the catalyst element after a cease of operation for a short-circuiting and after an electrolysis operation at a high current density, restricting catalyst loss to a little, and having a strong resistance to contamination caused by electrolyte impurity elements. The present invention relates to a cathode for hydrogen evolution with a catalyst layer formed on the cathode substrate, having, at least, three elements comprising platinum, cerium and palladium, as essential element, in a state of metal, metal oxide, or hydroxide, contained, where the mole fraction of respective element being x, y, and z, within a range of 5 mol %?x?90 mol %, 5 mol %?y?55 mol %, 5 mol %?z?65 mol %.Type: GrantFiled: January 18, 2011Date of Patent: September 15, 2015Assignee: PERMELEC ELECTRODE LTD.Inventors: Miwako Nara, Eri Miyakawa, Yoshinori Nishiki
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Publication number: 20140322632Abstract: The present invention provides an electrode for electrochemistry with a high quality, in which the surface area of the polycrystalline conductive diamond layer is increased and the crystal plane is controlled. In addition, when the catalyst layer of electrode substance is coated on the polycrystalline conductive diamond layer, adherence between the two layers is increased to provide an electrode for electrochemistry with a high durability. The polycrystalline conductive diamond layer is held under an atmosphere of carbon dioxide at a temperature 400 degrees Celsius or higher but 1000 degrees Celsius or lower to make the polycrystalline conductive diamond layer porous and make a specific crystal plane to remain and be formed.Type: ApplicationFiled: November 1, 2012Publication date: October 30, 2014Applicant: Permelec Electrode Ltd.Inventors: Wataru Sugimoto, Junfeng Zhang
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Patent number: 8815064Abstract: The present invention provides an ozone generator comprising an anode and a cathode provided on each side of a fluororesin type cation exchange membrane, the anode being a conductive diamond electrode having conductive diamond on the surface, wherein water is supplied to an anode compartment, DC current is supplied between the anode and the cathode to electrolyze water to evolve ozone from the anode compartment and hydrogen from a cathode compartment, the conductive diamond electrode comprising a substrate having a plurality of convexo-concave and a conductive diamond film coated on the surface of the substrate is applied as the conductive diamond electrode, and a close packed layer of ion exchange resin particles or the fluororesin type cation exchange membrane with notch is closely adhered to the surface of the anode side of the fluororesin type cation exchange membrane.Type: GrantFiled: November 26, 2010Date of Patent: August 26, 2014Assignee: Permelec Electrode Ltd.Inventors: Masaaki Kato, Rie Kawaguchi, Takamichi Kishi
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Publication number: 20140224649Abstract: The present invention provides a membrane-electrode assembly which includes: at least one rod-form or tubular electrode; a tubular diaphragm disposed around the periphery of the electrode; and a wire-form counter electrode disposed around the periphery of the diaphragm, the diaphragm being fixed to the rod-form or tubular electrode with the wire-form counter electrode to thereby form an electrode chamber having a gas/liquid passage between the diaphragm and the rod-form or tubular electrode.Type: ApplicationFiled: April 18, 2014Publication date: August 14, 2014Applicants: PERMELEC ELECTRODE LTD., Institute of National Colleges of Technology, JapanInventors: Noriyuki KITAORI, Kota SEKIDO, Tomoyasu SHIBATA, Tomohisa SUZUKI, Masashi TANAKA, Tsuneto FURUTA, Yoshinori NISHIKI
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Patent number: 8617377Abstract: An electrowinning method of metals through electrolysis of a metal chloride solution uses an anode comprising a substrate comprising titanium or titanium alloy, and a coating layer comprising a plurality of a unit layer, provided on the surface of the substrate. The unit layer comprises the first coating layer comprising a mixture of iridium oxide, ruthenium oxide and titanium oxide and the second coating layer comprising a mixture of platinum and iridium oxide. The first coating layer contacts with the surface of said substrate and an outer coating layer of the unit layer formed on the outermost layer of said coating layer is the second coating layer. The coating layer is formed by thermal decomposition baking, which followed by post-baking at a higher baking temperature.Type: GrantFiled: October 14, 2011Date of Patent: December 31, 2013Assignee: Permelec Electrode Ltd.Inventor: Toshikazu Hayashida
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Patent number: 8394245Abstract: An object of the present invention is to provide a production apparatus for electro-deposited metal foil or the like that can reduce thickness fluctuation of electro-deposited metal foil. To achieve the object, a production apparatus for electro-deposited metal foil or the like in which a cathode and an insoluble anode apart from each other, supplying an electrolytic solution through a gap between the cathode and the anode, making the cathode move along to the insoluble anode, electrodepositing a metal component on an electro-deposition surface of the moving cathode is applied.Type: GrantFiled: March 31, 2010Date of Patent: March 12, 2013Assignee: Permelec Electrode Ltd.Inventors: Yusuke Ozaki, Akira Kunimatsu
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Publication number: 20130032491Abstract: This invention is to provide a membrane-electrode assembly, an electrolytic cell using the same, a method and an apparatus for producing ozone water, a method for disinfection and a method for wastewater or waste fluid treatment, by using which allow electrolysis reaction products or decomposition products to be produced at a high efficiency, channel pressure drop to be minimized, and the apparatus to be designed compact in size without sacrificing the production capacity. This invention relates to a membrane-electrode assembly, comprising an anode having a plurality of through-holes of 0.1 mm or more in diameter; a cathode having a plurality of through-holes of 0.1 mm or more in diameter at the same sites as in the anode; and a solid polymer electrolyte membrane coated on one face or the entire face of at least one of the anode and the cathode with the through-holes being maintained, wherein the anode, the solid polymer electrolyte membrane and the cathode are tightly adhered.Type: ApplicationFiled: November 29, 2010Publication date: February 7, 2013Applicants: PERMELEC ELECTRODE LTD., AQUAECOS LTD.Inventors: Hideo Nitta, Masashi Hosonuma
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Patent number: 8366889Abstract: Subject The present invention aims to provide an anode for electrolysis by an ion exchange membrane process and the manufacturing method thereof which can show a lower concentration of by-product oxygen gas in chlorine gas and a lower overvoltage stably for a long time, compared with conventional anodes.Type: GrantFiled: May 20, 2011Date of Patent: February 5, 2013Assignee: Permelec Electrode Ltd.Inventor: Toshikazu Hayashida
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Publication number: 20130026096Abstract: This invention is to provide a membrane-electrode assembly, an electrolytic cell using the same, a method and an apparatus for producing ozone water, a method for disinfection and a method for wastewater or waste fluid treatment, by using which electrolysis reaction products or decomposition products obtained at the anode are produced at a high efficiency; channel pressure drop is minimized; and the apparatus is designed in compact size without sacrificing the production capacity. This invention relates to a membrane-electrode assembly comprising a solid polymer electrolyte membrane having a cation exchange membrane, an anode and a cathode tightly adhered to the respective surfaces of the solid polymer electrolyte membrane, with a plurality of through-holes with 0.Type: ApplicationFiled: November 29, 2010Publication date: January 31, 2013Applicants: PERMELEC ELECTRODE LTD., AQUAECOS LTD.Inventors: Hideo Nitta, Masashi Hosonuma
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Patent number: 8349164Abstract: The present invention provides a conductive diamond electrode structure for use in electrolytic synthesis of a fluorine-containing material with a fluoride ion-containing molten salt electrolytic bath, which comprises: a conductive electrode feeder; and a conductive diamond catalyst carrier comprising a conductive substrate and a conductive diamond film carried on a surface thereof, wherein the conductive diamond catalyst carrier is detachably attached to the conductive electrode feeder at a portion to be immersed in the electrolytic bath. Also disclosed is an electrolytic synthesis of a fluorine-containing material using the conductive diamond electrode structure.Type: GrantFiled: June 20, 2008Date of Patent: January 8, 2013Assignee: Permelec Electrode Ltd.Inventors: Tsuneto Furuta, Setsuro Ogata, Masaharu Uno
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Patent number: 8337958Abstract: A process for manufacturing electrodes for electrolysis, including the steps of forming an arc ion plating undercoating layer comprising valve metal or valve metal alloy including a crystalline tantalum component and a crystalline titanium component on the surface of the electrode substrate comprising valve metal or valve metal alloy, by an arc ion plating method; heat sintering the electrode substrate to transform only the tantalum component of the arc ion plating undercoating layer into an amorphous substance; and forming an electrode catalyst layer on the surface of the arc ion plating undercoating layer including the valve metal or valve metal alloy including the tantalum component transformed to the amorphous substance and the crystalline titanium component.Type: GrantFiled: March 18, 2009Date of Patent: December 25, 2012Assignee: Permelec Electrode Ltd.Inventors: Yi Cao, Masashi Hosonuma
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Patent number: 8338323Abstract: The present invention provides a process for producing an electrode for electrochemical reaction, wherein a conductive diamond layer is formed on an electrode substrate in the electrode; and the electrode substrate on which the conductive diamond layer is formed is kept at a temperature of 400° C. or more and 1,000° C. or less in a water vapor, thereby forming a micropore in the conductive diamond layer. Also, the present invention provides an electrode for electrochemical reaction obtained by the foregoing production process.Type: GrantFiled: September 9, 2010Date of Patent: December 25, 2012Assignees: Permelec Electrode Ltd., Shinshu UniversityInventors: Yoshio Takasu, Wataru Sugimoto, Tatsuya Ohashi, Junfeng Zhang
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Publication number: 20120305389Abstract: The present invention aims to provide an activated cathode enabling a long-time stable operation with hydrogen overvoltage maintained at a low value, keeping a high remaining rate of the catalyst element after a cease of operation for a short-circuiting and after an electrolysis operation at a high current density, restricting catalyst loss to a little, and having a strong resistance to contamination caused by electrolyte impurity elements. The present invention relates to a cathode for hydrogen evolution with a catalyst layer formed on the cathode substrate, having, at least, three elements comprising platinum, cerium and palladium, as essential element, in a state of metal, metal oxide, or hydroxide, contained, where the mole fraction of respective element being x, y, and z, within a range of 5 mol %?x?90 mol %, 5 mol %?y?55 mol %, 5 mol %?z?65 mol %.Type: ApplicationFiled: January 18, 2011Publication date: December 6, 2012Applicant: PERMELEC ELECTRODE LTD.Inventors: Miwako Nara, Eri Miyakawa, Yoshinori Nishiki
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Publication number: 20120111735Abstract: An electrowinning method of metals through electrolysis of a metal chloride solution uses an anode comprising a substrate comprising titanium or titanium alloy, and a coating layer comprising a plurality of a unit layer, provided on the surface of the substrate. The unit layer comprises the first coating layer comprising a mixture of iridium oxide, ruthenium oxide and titanium oxide and the second coating layer comprising a mixture of platinum and iridium oxide. The first coating layer contacts with the surface of said substrate and an outer coating layer of the unit layer formed on the outermost layer of said coating layer is the second coating layer. The coating layer is formed by thermal decomposition baking, which followed by post-baking at a higher baking temperature.Type: ApplicationFiled: October 14, 2011Publication date: May 10, 2012Applicant: PERMELEC ELECTRODE LTD.Inventor: Toshikazu HAYASHIDA
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Patent number: 8070924Abstract: The present invention provides an electrode for generation of hydrogen comprising: a conductive substrate; a catalytic layer formed on the conductive substrate and containing at least one platinum group metal selected from the group consisting of Pt, Ir, Ru, Pd and Rh; and a hydrogen adsorption layer formed on the catalytic layer. The present invention also provides an electrode for generation of hydrogen comprising: a conductive substrate, a catalytic layer formed on the conductive substrate and containing: at least one platinum group metal selected from the group consisting of Pt, Ir, Ru, Pd and Rh and/or at least one oxide of said platinum group metals; and at least one metal selected from the group consisting of lanthanum series metals, valve metals, iron series metals and silver and/or at least one oxide of said metals; and a hydrogen adsorption layer formed on the catalytic layer.Type: GrantFiled: March 24, 2008Date of Patent: December 6, 2011Assignee: Permelec Electrode Ltd.Inventors: Takeo Ohsaka, Shunsuke Sata, Miwako Nara, Yoshinori Nishiki