Patents by Inventor Yuuichirou HIRAI

Yuuichirou HIRAI 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: 11040334
    Abstract: Provided is a catalyst for reduction reaction with which 1,4-butanediol or tetrahydrofuran can be obtained with higher selectivity than with the related art, using a raw material derived from biomass. The catalyst is used in a reduction reaction of 3,4-dihydroxytetrahydrofuran with hydrogen, wherein the catalyst contains metal catalysts (1) and (2) below; metal catalyst (1): a catalyst containing M1 and M2 below as metal species and supported on a carrier; and metal catalyst (2): a catalyst containing M1 below as a metal species and supported on a carrier; M1: one or more selected from the group consisting of iron and elements belonging to periods 4 to 6 and groups 5 to 7 of the periodic table; and M2: one or more selected from the group consisting of ruthenium, osmium, and elements belonging to periods 4 to 6 and groups 9 to 11 of the periodic table.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: June 22, 2021
    Assignee: DAICEL CORPORATION
    Inventors: Keiichi Tomishige, Yoshinao Nakagawa, Masazumi Tamura, Yuuichirou Hirai, Yasuteru Kajikawa, Keisuke Ono
  • Patent number: 10751704
    Abstract: A hydrogenation reaction catalyst used for a reaction of 1,4-anhydroerythritol and hydrogen to produce 3-hydroxytetrahydrofuran includes a carrier, at least one oxide selected from the group consisting of an oxide of a Group 6 element and an oxide of a Group 7 element, the oxide being supported on the carrier, and a metal other than a Group 6 element and a Group 7 element, the other metal being supported on the carrier. The amount of the oxide supported on the carrier in terms of a metal atom forming the oxide is 0.01 to 10% by weight based on the total amount of the oxide and the carrier being 100% by weight. The molar ratio in terms of metal of the other metal to the Group 6 element and Group 7 element forming the oxide [other metal/Group 6 element and Group 7 element] is 50/1 to 1/4.
    Type: Grant
    Filed: May 10, 2019
    Date of Patent: August 25, 2020
    Assignee: DAICEL CORPORATION
    Inventors: Keiichi Tomishige, Yoshinao Nakagawa, Yasuteru Kajikawa, Yuuichirou Hirai
  • Publication number: 20190366304
    Abstract: Provided is a catalyst for reduction reaction with which 1,4-butanediol or tetrahydrofuran can be obtained with higher selectivity than with the related art, using a raw material derived from biomass. The catalyst is used in a reduction reaction of 3,4-dihydroxytetrahydrofuran with hydrogen, wherein the catalyst contains metal catalysts (1) and (2) below; metal catalyst (1): a catalyst containing M1 and M2 below as metal species and supported on a carrier; and metal catalyst (2): a catalyst containing M1 below as a metal species and supported on a carrier; M1: one or more selected from the group consisting of iron and elements belonging to periods 4 to 6 and groups 5 to 7 of the periodic table; and M2: one or more selected from the group consisting of ruthenium, osmium, and elements belonging to periods 4 to 6 and groups 9 to 11 of the periodic table.
    Type: Application
    Filed: December 28, 2017
    Publication date: December 5, 2019
    Applicant: DAICEL CORPORATION
    Inventors: Keiichi TOMISHIGE, Yoshinao NAKAGAWA, Masazumi TAMURA, Yuuichirou HIRAI, Yasuteru KAJIKAWA, Keisuke ONO
  • Publication number: 20190276309
    Abstract: Provided is a method for generating hydrogen at a desired rate, using a hydrogen storage material that can be stored and transported safely and inexpensively. The method according to the present invention for producing a silanol compound and hydrogen includes subjecting a hydrosilane compound and water to a reaction with each other in the presence of a solid catalyst to give a silanol compound and hydrogen. The solid catalyst includes hydroxyapatite and gold particles supported on the hydroxyapatite, where the gold particles have an average particle size of 2.5 nm or less. The reaction in the method according to the present invention for producing a silanol compound and hydrogen is preferably performed in an air atmosphere. The reaction in the method according to the present invention for producing a silanol compound and hydrogen can be performed with application of substantially no heat and no activated energy rays.
    Type: Application
    Filed: September 8, 2017
    Publication date: September 12, 2019
    Applicants: OSAKA UNIVERSITY, DAICEL CORPORATION
    Inventors: Kiyotomi KANEDA, Takato MITSUDOME, Yasuteru KAJIKAWA, Yuuichirou HIRAI, Keisuke ONO
  • Publication number: 20190262805
    Abstract: A hydrogenation reaction catalyst used for a reaction of 1,4-anhydroerythritol and hydrogen to produce 3-hydroxytetrahydrofuran includes a carrier, at least one oxide selected from the group consisting of an oxide of a Group 6 element and an oxide of a Group 7 element, the oxide being supported on the carrier, and a metal other than a Group 6 element and a Group 7 element, the other metal being supported on the carrier. The amount of the oxide supported on the carrier in terms of a metal atom forming the oxide is 0.01 to 10% by weight based on the total amount of the oxide and the carrier being 100% by weight. The molar ratio in terms of metal of the other metal to the Group 6 element and Group 7 element forming the oxide [other metal/Group 6 element and Group 7 element] is 50/1 to 1/4.
    Type: Application
    Filed: May 10, 2019
    Publication date: August 29, 2019
    Applicant: DAICEL CORPORATION
    Inventors: Keiichi TOMISHIGE, Yoshinao NAKAGAWA, Yasuteru KAJIKAWA, Yuuichirou HIRAI
  • Publication number: 20150298101
    Abstract: An object of the present invention is to provide a method for producing 3-hydroxytetrahydrofuran that can be used as a raw material for 1,3-butane diol, using as a raw material a compound that can be derived from biomass. The present invention relates to a method for producing 3-hydroxytetrahydrofuran including a step of reacting 1,4-anhydroerythritol and hydrogen to produce 3-hydroxytetrahydrofuran. In the production method, the step of reacting 1,4-anhydroerythritol and hydrogen is preferably allowed to proceed in the presence of a catalyst comprising a carrier and at least one oxide selected from the group consisting of an oxide of a Group 6 element and an oxide of a Group 7 element, the oxide being supported on the carrier.
    Type: Application
    Filed: October 30, 2013
    Publication date: October 22, 2015
    Applicant: DAICEL CORPORATION
    Inventors: Keiichi TOMISHIGE, Yoshinao NAKAGAWA, Yasuteru KAJIKAWA, Yuuichirou HIRAI