Patents by Inventor Yuuta Nakazawa

Yuuta Nakazawa 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).

  • Publication number: 20180071721
    Abstract: Provided are a catalyst that may suppress the production of a coke-like substance in a reaction for producing a conjugated diolefin from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen. A composite metal oxide catalyst for producing a conjugated diolefin from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen by a catalytic oxidative dehydrogenation reaction, the composite metal oxide catalyst having a relative intensity range of X-ray diffraction peaks represented by the following Formula (A): 0?Rh(=Ph1/Ph2)<0.8 (A) wherein Ph1 represents the maximum peak height within the range of 2?=28.1°±0.2° for the X-ray diffraction peaks; Ph2 represents the maximum peak height within the range of 2?=27.9°±0.2° for the X-ray diffraction peaks; and Rh represents the relative intensity ratio of Ph1 with respect to Ph2.
    Type: Application
    Filed: March 2, 2016
    Publication date: March 15, 2018
    Applicant: NIPPON KAYAKU KABUSHIKI KAISHA
    Inventors: Shigeki OKUMURA, Yuuta NAKAZAWA, Hiroki MOTOMURA, Bungo NISHIZAWA, Koji NAKAYAMA
  • Publication number: 20180029019
    Abstract: Provided are a catalyst which, in a reaction. for producing a conjugated diolefin by catalytic oxidative dehydrogenation from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen, may suppress the production of a coke-like substance and improve the long-term stability of the reaction; and a method for producing the same. Disclosed is a composite metal oxide catalyst for producing a conjugated diolefin by a gas phase catalytic oxidative dehydrogenation reaction from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen, the composite metal oxide catalyst having a solid acidity of 35 to 172 ?mol/g.
    Type: Application
    Filed: March 2, 2016
    Publication date: February 1, 2018
    Applicant: NIPPON KAYAKU KABUSHIKI KAISHA
    Inventors: Yuuta NAKAZAWA, Shigeki OKUMURA, Hiroki MOTOMURA, Bungo NISHIZAWA, Koji NAKAYAMA
  • Patent number: 9656248
    Abstract: Provided is a catalyst having high activity and yield of a target product for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid and further having high mechanical strength. The catalyst is a catalyst prepared by a method in which a catalyst formulation satisfies specified atomic ratios; and in the preparation thereof, a molybdenum component raw material is an ammonium molybdate, a solvent for dissolving the ammonium molybdate is water, a bismuth component raw material is bismuth nitrate, and a solvent for dissolving bismuth nitrate is a nitric acid aqueous solution, and the weight of water for dissolving the ammonium molybdate, the weight of the nitric acid aqueous solution for dissolving the bismuth nitrate, and the acid concentration of the nitric acid aqueous solution are satisfied with specified ranges, respectively.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: May 23, 2017
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Yuuta Nakazawa, Yoshiko Shoya, Masaki Nakahara, Eiji Nishimura, Kazuo Shiraishi, Tatsuhiko Kurakami, Ryota Hiraoka
  • Patent number: 9580376
    Abstract: Provided is a method of subjecting an alkene to partial oxidation by using a fixed bed multitubular reactor, thereby producing an unsaturated aldehyde and/or an unsaturated carboxylic acid each corresponding to the alkene, wherein a plurality of catalyst layers formed by N division (N is N?2) with respect to a gas flow direction of a reaction tube are provided, and when a change (° C.) of hot spot temperature per 1° C. change of reaction bath temperature in the catalyst layer is designated as Sn, at least one of the plurality of catalyst layers is regulated to Sn?6.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: February 28, 2017
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Tomoyuki Kawamura, Tatsuhiko Kurakami, Yuuta Nakazawa, Toru Kawaguchi, Motohiko Sugiyama
  • Patent number: 9440904
    Abstract: Provided is a method capable of producing acrolein and/or acrylic acid, or methacrolein and/or methacrylic acid, stably in a high yield over a long period of time advantageously even in a high-load reaction, and the method is a method in which when preparing two or more kinds of catalysts having different formulations and stacking two or more layers in the axial direction of the tube, the catalysts are filled in such a manner that not only the component amount of bismuth relative to molybdenum decreases from the gas inlet side toward the gas outlet side, but also the component amount of iron relative to molybdenum increases from the gas inlet side toward the gas outlet side.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: September 13, 2016
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Yuuta Nakazawa, Tatsuhiko Kurakami, Kazuo Shiraishi
  • Publication number: 20160145180
    Abstract: Provided is a method of subjecting an alkene to partial oxidation by using a fixed bed multitubular reactor, thereby producing an unsaturated aldehyde and/or an unsaturated carboxylic acid each corresponding to the alkene, wherein a plurality of catalyst layers formed by N division (N is N?2) with respect to a gas flow direction of a reaction tube are provided, and when a change (° C.) of hot spot temperature per 1° C. change of reaction bath temperature in the catalyst layer is designated as Sn, at least one of the plurality of catalyst layers is regulated to Sn?6.
    Type: Application
    Filed: July 17, 2014
    Publication date: May 26, 2016
    Applicant: NIPPON KAYAKU KABUSHIKI KAISHA
    Inventors: Tomoyuki KAWAMURA, Tatsuhiko KURAKAMI, Yuuta NAKAZAWA, Toru KAWAGUCHI, Motohiko SUGIYAMA
  • Publication number: 20160145181
    Abstract: Provided is a method capable of producing acrolein and/or acrylic acid, or methacrolein and/or methacrylic acid, stably in a high yield over a long period of time advantageously even in a high-load reaction, and the method is a method in which when preparing two or more kinds of catalysts having different formulations and stacking two or more layers in the axial direction of the tube, the catalysts are filled in such a manner that not only the component amount of bismuth relative to molybdenum decreases from the gas inlet side toward the gas outlet side, but also the component amount of iron relative to molybdenum increases from the gas inlet side toward the gas outlet side.
    Type: Application
    Filed: July 17, 2014
    Publication date: May 26, 2016
    Inventors: Yuuta Nakazawa, Tatsuhiko Kurakami, Kazuo Shiraishi
  • Publication number: 20160059218
    Abstract: Provided is a catalyst having high activity and yield of a target product for producing an unsaturated aldehyde and/or an unsaturated carboxylic acid and further having high mechanical strength. The catalyst is a catalyst prepared by a method in which a catalyst formulation satisfies specified atomic ratios; and in the preparation thereof, a molybdenum component raw material is an ammonium molybdate, a solvent for dissolving the ammonium molybdate is water, a bismuth component raw material is bismuth nitrate, and a solvent for dissolving bismuth nitrate is a nitric acid aqueous solution, and the weight of water for dissolving the ammonium molybdate, the weight of the nitric acid aqueous solution for dissolving the bismuth nitrate, and the acid concentration of the nitric acid aqueous solution are satisfied with specified ranges, respectively.
    Type: Application
    Filed: May 8, 2014
    Publication date: March 3, 2016
    Inventors: Yuuta Nakazawa, Yoshiko Shoya, Masaki Nakahara, Eiji Nishimura, Kazuo Shiraishi, Tatsuhiko Kurakami, Ryota Hiraoka