Patents by Inventor Kazuaki Nakagawa

Kazuaki Nakagawa 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).

  • Patent number: 7799720
    Abstract: A method of regenerating a carbon dioxide gas absorbent includes heating a carbon dioxide gas absorbent containing lithium silicate, which has been absorbed a carbon dioxide gas, under a reduced pressure atmosphere to release the carbon dioxide gas.
    Type: Grant
    Filed: February 1, 2006
    Date of Patent: September 21, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Kato, Kazuaki Nakagawa, Kenji Essaki, Sawako Yoshikawa
  • Patent number: 7201889
    Abstract: A fuel reforming method includes the step of supplying carbon-containing fuel and steam to a reactor filled with a fuel reforming catalyst and a CO2 absorbent and discharging CO2, and setting the absorbent at an absorption temperature, thereby converting the carbon-containing fuel into reformed fuel, and separating CO2 from the reformed fuel, the step of obtaining a product gas by oxidizing a portion of the reformed fuel and/or the carbon-containing fuel with an oxidizer, and heating the absorbent with this product gas to a regeneration temperature, thereby regenerating the absorbent and storing heat in this absorbent, and the step of supplying the carbon-containing fuel and steam to the reactor, thereby cooling, to the absorption temperature, the absorbent heated to the regeneration temperature, and converting the carbon-containing fuel into reformed fuel by heat energy stored in the CO2 absorbent. An apparatus for the method is also disclosed.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: April 10, 2007
    Assignees: Kabushiki Kaisha Toshiba, Toyo Engineering Corporation
    Inventors: Keiji Murata, Kazuaki Nakagawa, Yoshikazu Hagiwara, Kazuya Yamada, Mitsutoshi Hamamura, Yasuhito Sakakibara, Hidetsugu Fujii
  • Patent number: 7182881
    Abstract: A fire extinguishing agent contains at least one compound selected from the group consisting of an alkali hydrogencarbonate and an alkali carbonate, the alkali hydrogencarbonate being thermally decomposed to generate carbon dioxide and an alkali carbonate, a metal oxide that reacts with the alkali carbonate to generate carbon dioxide, and a hydrophobic binder.
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: February 27, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Kato, Sawako Yoshikawa, Kenji Essaki, Kazuaki Nakagawa
  • Publication number: 20060183628
    Abstract: A method of regenerating a carbon dioxide gas absorbent includes heating a carbon dioxide gas absorbent containing lithium silicate, which has been absorbed a carbon dioxide gas, under a reduced pressure atmosphere to release the carbon dioxide gas.
    Type: Application
    Filed: February 1, 2006
    Publication date: August 17, 2006
    Inventors: Masahiro Kato, Kazuaki Nakagawa, Kenji Essaki, Sawako Yoshikawa
  • Publication number: 20050106088
    Abstract: A halogen-containing gas absorbent comprising a lithium-containing composite oxide such as lithium silicate having an average particle diameter of 50 ?m to 3 mm can absorb a halogen-containing gas regardless of the water vapor amount in an ambient.
    Type: Application
    Filed: September 8, 2004
    Publication date: May 19, 2005
    Inventors: Masahiro Kato, Kazuaki Nakagawa, Sawako Yoshikawa, Kenji Essaki
  • Publication number: 20050025682
    Abstract: A chemical reaction apparatus includes a reaction chamber and a carbon dioxide absorbent chamber disposed behind the reaction chamber in adjacent to it. The reaction chamber generates a gas containing hydrogen and carbon dioxide from the material gas, and the carbon dioxide absorbent chamber absorbs carbon dioxide from the gas generated from the reaction chamber.
    Type: Application
    Filed: June 25, 2004
    Publication date: February 3, 2005
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kenji Essaki, Masahiro Kato, Sawako Yoshikawa, Kazuaki Nakagawa
  • Publication number: 20040118576
    Abstract: A fire extinguishing agent contains at least one compound selected from the group consisting of an alkali hydrogencarbonate and an alkali carbonate, the alkali hydrogencarbonate being thermally decomposed to generate carbon dioxide and an alkali carbonate, a metal oxide that reacts with the alkali carbonate to generate carbon dioxide, and a hydrophobic binder.
    Type: Application
    Filed: August 14, 2003
    Publication date: June 24, 2004
    Inventors: Masahiro Kato, Sawako Yoshikawa, Kenji Essaki, Kazuaki Nakagawa
  • Patent number: 6712879
    Abstract: There is disclosed a carbon dioxide gas absorbent comprising lithium silicate, 0.5 mol % to 4.9 mol % of alkali carbonate per mole of the lithium silicate, and at least one element selected from the group consisting of aluminum, magnesium, calcium, iron, titanium and carbon.
    Type: Grant
    Filed: September 6, 2002
    Date of Patent: March 30, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Kato, Sawako Yoshikawa, Kenji Essaki, Kazuaki Nakagawa
  • Publication number: 20030232722
    Abstract: One embodiment of the present invention provides a carbon dioxide gas absorbent, which includes at least one compound selected from the group including sodium silicate, potassium silicate, and a combination thereof; and lithium silicate. Another embodiment of the present invention provides A carbon dioxide gas absorbent, which includes at least one compound selected from the group including sodium-based anhydrous water glass, potassium-based anhydrous water glass, and a combination thereof; and lithium silicate. The present invention also provides for methods of making the absorbents and methods of using same.
    Type: Application
    Filed: March 6, 2003
    Publication date: December 18, 2003
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Kato, Sawako Yoshikawa, Kenji Essaki, Kazuaki Nakagawa
  • Publication number: 20030150163
    Abstract: A fuel reforming method includes the step of supplying carbon-containing fuel and steam to a reactor filled with a fuel reforming catalyst and a CO2 absorbent and discharging CO2, and setting the absorbent at an absorption temperature, thereby converting the carbon-containing fuel into reformed fuel, and separating CO2 from the reformed fuel, the step of obtaining a product gas by oxidizing a portion of the reformed fuel and/or the carbon-containing fuel with an oxidizer, and heating the absorbent with this product gas to a regeneration temperature, thereby regenerating the absorbent and storing heat in this absorbent, and the step of supplying the carbon-containing fuel and steam to the reactor, thereby cooling, to the absorption temperature, the absorbent heated to the regeneration temperature, and converting the carbon-containing fuel into reformed fuel by heat energy stored in the CO2 absorbent. An apparatus for the method is also disclosed.
    Type: Application
    Filed: January 24, 2003
    Publication date: August 14, 2003
    Inventors: Keiji Murata, Kazuaki Nakagawa, Yoshikazu Hagiwara, Kazuya Yamada, Mitsutoshi Hamamura, Yasuhito Sakakibara, Hidetsugu Fujii
  • Publication number: 20030075050
    Abstract: There is disclosed a carbon dioxide gas absorbent comprising lithium silicate, 0.5 mol % to 4.9 mol % of alkali carbonate per mole of the lithium silicate, and at least one element selected from the group consisting of aluminum, magnesium, calcium, iron, titanium and carbon.
    Type: Application
    Filed: September 6, 2002
    Publication date: April 24, 2003
    Inventors: Masahiro Kato, Sawako Yoshikawa, Kenji Essaki, Kazuaki Nakagawa
  • Patent number: 6387845
    Abstract: Disclosed is a carbon dioxide gas absorbent containing lithium silicate reacting with a carbon dioxide gas to form lithium carbonate and represented by the general formula, LixSiyOz, where x, y, z are integers meeting the requirement of x+4y−2z=0. The lithium content x in the general formula should desirably be at least 4.
    Type: Grant
    Filed: March 16, 2000
    Date of Patent: May 14, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kato Masahiro, Kazuaki Nakagawa, Toshiyuki Ohashi, Sawako Yoshikawa, Kenji Essaki
  • Publication number: 20020037810
    Abstract: Disclosed is a carbon dioxide gas absorbent containing lithium silicate reacting with a carbon dioxide gas to form lithium carbonate and represented by the general formula, LixSiyOz, where x, y, z are integers meeting the requirement of x+4y−2z=0. The lithium content x in the general formula should desirably be at least 4.
    Type: Application
    Filed: March 16, 2000
    Publication date: March 28, 2002
    Inventors: Kazuaki Nakagawa, Masahiro Kato, Toshiyuki Ohashi, Sawako Yoshikawa, Kenji Essaki
  • Patent number: 6306535
    Abstract: A binder layer is formed on a surface of ceramic powder. This ceramic powder is formed into a sheet to form a sheet for an electrolyte plate of a molten carbonate fuel cell, to which a carbonate electrolyte is impregnated, thereby an electrolyte plate is constituted.
    Type: Grant
    Filed: March 29, 1999
    Date of Patent: October 23, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Norihiro Tomimatsu, Hideyuki Ohzu, Yoshihiro Akasaka, Kazuaki Nakagawa
  • Patent number: 6271172
    Abstract: The carbon dioxide gas absorbent of the present invention exhibits a high carbon dioxide gas absorption performance from an initial stage of the use. The carbon dioxide gas absorbent comprises of primary particles each containing lithium zirconia serving as a matrix, and eutectic compound molecules each containing lithium carbonate and at least one element selected from the group consisting of alkali metals excluding lithium, and alkali earth metals, which are dispersed in the matrix.
    Type: Grant
    Filed: July 31, 1998
    Date of Patent: August 7, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toshiyuki Ohashi, Kazuaki Nakagawa, Hideyuki Ohzu, Yoshihiro Akasaka, Norihiro Tomimatsu
  • Publication number: 20010001782
    Abstract: The carbon dioxide gas absorbent of the present invention exhibits a high carbon dioxide gas absorption performance from an initial stage of the use. The carbon dioxide gas absorbent comprises of primary particles each containing lithium zirconia serving as a matrix, and eutectic compound molecules each containing lithium carbonate and at least one element selected from the group consisting of alkali metals excluding lithium, and alkali earth metals, which are dispersed in the matrix.
    Type: Application
    Filed: July 31, 1998
    Publication date: May 24, 2001
    Applicant: Toshiyuki Ohashi
    Inventors: TOSHIYUKI OHASHI, KAZUAKI NAKAGAWA, HIDEYUKI OHZU, YOSHIHIRO AKASAKA, NORIHIRO TOMIMATSU
  • Patent number: 6037076
    Abstract: A molten carbonate fuel cell comprises a fuel electrode, an oxidizing agent electrode, and an electrolyte body prepared by impregnating a porous body including a retaining material and a reinforcing material with an electrolyte containing an alkali carbonate. The retaining material consists essentially of .alpha.-lithium aluminate (.alpha.-LiAlO.sub.2) having at most 0.60.degree. of a half value width of (104) peak in an X-ray powder diffractometry.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: March 14, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Norihiro Tomimatsu, Hideyuki Ohzu, Yoshihiro Akasaka, Kazuaki Nakagawa
  • Patent number: 6024774
    Abstract: The chemical reaction apparatus of the present invention can increase the producing rate of the main product gas by effectively removing carbon dioxide from the reaction site, the carbon dioxide generated together with the main product as the raw material gas is made to react at a high temperature of 400.degree. C. The reaction apparatus comprises a reactor for generating a main product gas and a byproduct gas which is carbon dioxide, by making a raw material gas to react, and lithium zirconate granular material placed in the reactor, to react with the byproduct carbon dioxide gas, thereby preparing a carbonate salt.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: February 15, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuaki Nakagawa, Hideyuki Ohzu, Toshiyuki Ohashi, Yoshihiro Akasaka, Norihiro Tomimatsu
  • Patent number: 5989740
    Abstract: A molten carbonate fuel cell of high performance and long life, which is capable of preventing the corrosion at the contacting portion between collector plates (in particular, an oxidizing gas-side collector plate) and the interconnector so as to suppress an increase of contact resistance.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: November 23, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Norihiro Tomimatsu, Hideyuki Ohzu, Kazuaki Nakagawa, Yoshihiro Akasaka
  • Patent number: 5866090
    Abstract: A method is disclosed for selectively separating carbon dioxide gas by contacting the carbon dioxide containing gas with a composition containing lithium zirconia at a temperature of 450.degree. C. or more so that carbon dioxide reacts with the lithium zirconia to produce lithium carbonate and zirconia. Subjecting the lithium carbonate and zirconia to a temperature of 600.degree. C. or more so as to produce lithium zirconia and carbon dioxide.
    Type: Grant
    Filed: July 31, 1996
    Date of Patent: February 2, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuaki Nakagawa, Hideyuki Ohzu, Yoshihiro Akasaka, Norihiro Tomimatsu, Akiko Watanabe