Patents by Inventor Takahiko Takewaki

Takahiko Takewaki 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: 10953364
    Abstract: The present invention addresses the problem of providing a technology for efficiently separating carbon dioxide in a method for separating carbon dioxide from a mixed gas by using a membrane separation method. The problem is solved by a method including supplying a mixed gas to a separation membrane module to separate carbon dioxide from the mixed gas, in which the mixed gas is supplied to the separation membrane module at a high linear velocity in order to sufficiently mix a mixed gas in the vicinity of a membrane.
    Type: Grant
    Filed: September 4, 2018
    Date of Patent: March 23, 2021
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Mikio Hayashi, Takahiko Takewaki, Nobuhiko Ueno
  • Publication number: 20200047168
    Abstract: This transition metal-loaded zeolite is configured such that an absorption intensity ratio in a specific region of the transition metal-loaded zeolite observed by ultraviolet-visible-near infrared spectroscopy (UV-Vis-NIR) and an intensity ratio of a maximum peak in a different temperature range of the transition metal-loaded zeolite measured by ammonia temperature-programmed desorption, respectively fall within specific ranges.
    Type: Application
    Filed: March 12, 2018
    Publication date: February 13, 2020
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Yuusuke HOTTA, Manabu TANAKA, Takahiko TAKEWAKI, Takeshi MATSUO
  • Publication number: 20190344223
    Abstract: The present invention relates to a process for producing a porous support-zeolite membrane composite, which comprises forming a CHA type zeolite membrane on a porous support by a hydrothermal synthesis in the presence of seed crystals, wherein an FAU type zeolite is used as the seed crystals.
    Type: Application
    Filed: July 29, 2019
    Publication date: November 14, 2019
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Nobutake Tanabe, Takahiko Takewaki, Miki Yamada, Kouhei Takatani
  • Publication number: 20190321810
    Abstract: Provided is a method for producing an inexpensive, high-performance AEI type zeolite and an AEI type zeolite having a Si/Al ratio of 6.5 or less by using neither an expensive Y type zeolite as a raw material nor dangerous hydrofluoric acid. The method for producing an AEI type zeolite having a Si/Al ratio of 50 or less includes: preparing a mixture including a silicon atom material, an aluminum atom material, an alkali metal atom material, an organic structure-directing agent, and water; and performing hydrothermal synthesis of the obtained mixture, in which a compound having a Si content of 20% by weight or less and containing aluminum is used as the aluminum atom material; and the mixture includes a zeolite having a framework density of 14 T/1000 ?3 or more in an amount of 0.1% by weight or more with respect to SiO2 assuming that all Si atoms in the mixture are formed in SiO2.
    Type: Application
    Filed: June 12, 2019
    Publication date: October 24, 2019
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Manabu TANAKA, Takahiko Takewaki, Takeshi Matsuo, Masahiro Hara
  • Publication number: 20190299167
    Abstract: An object of the present invention is to provide a porous support-zeolite membrane composite ensuring that at the time of separation or concentration with a zeolite membrane, both sufficient throughput and high separation performance are achieved in practice and the present invention relates to a porous support-zeolite membrane composite having a porous support and a zeolite membrane formed on the porous support, wherein part of the zeolite membrane penetrates into the inside of the porous support and the distance from the surface of the porous support to the inside into which the zeolite film penetrates is 5.0 ?m or less on average.
    Type: Application
    Filed: June 19, 2019
    Publication date: October 3, 2019
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Ayuko ONOZUKA, Miki YAMADA, Mikio HAYASHI, Takahiko TAKEWAKI
  • Patent number: 10406486
    Abstract: The present invention relates to a process for producing a porous support-zeolite membrane composite, which comprises forming a CHA type zeolite membrane on a porous support by a hydrothermal synthesis in the presence of seed crystals, wherein an FAU type zeolite is used as the seed crystals.
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: September 10, 2019
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Nobutake Tanabe, Takahiko Takewaki, Miki Yamada, Kouhei Takatani
  • Publication number: 20190263741
    Abstract: The present invention aims at providing a method for producing a high-concentration alcohol from a water-alcohol mixture, in which the overall process is efficient and the present invention relates to a production method of a high-concentration alcohol, including a water adsorption step of adsorbing water of a water-alcohol mixture on an adsorption column to obtain a first concentrated alcohol, a water desorption step of introducing an alcohol to obtain a hydrous alcohol, and a membrane separation step of introducing the hydrous alcohol into a membrane separation unit provided with a membrane composite containing zeolite having an SiO2/Al2O3 molar ratio of 5 to 15 to obtain a second concentrated alcohol.
    Type: Application
    Filed: May 9, 2019
    Publication date: August 29, 2019
    Applicants: MITSUBISHI CHEMICAL CORPORATION, MITSUBISHI CHEMICAL ENGINEERING CORPORATION
    Inventors: Kazuhide MAEDA, Koichi YAMAZAKI, Hiroyuki KAKIUCHI, Takeshi TAHARA, Takahiko TAKEWAKI
  • Patent number: 10369528
    Abstract: An object of the present invention is to provide a porous support-zeolite membrane composite ensuring that at the time of separation or concentration with a zeolite membrane, both sufficient throughput and high separation performance are achieved in practice and the present invention relates to a porous support-zeolite membrane composite having a porous support and a zeolite membrane formed on the porous support, wherein part of the zeolite membrane penetrates into the inside of the porous support and the distance from the surface of the porous support to the inside into which the zeolite film penetrates is 5.0 ?m or less on average.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: August 6, 2019
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Ayuko Onozuka, Miki Yamada, Mikio Hayashi, Takahiko Takewaki
  • Patent number: 10357760
    Abstract: Provided is a method for producing an inexpensive, high-performance AEI type zeolite and an AEI type zeolite having a Si/Al ratio of 6.5 or less by using neither an expensive Y type zeolite as a raw material nor dangerous hydrofluoric acid. The method for producing an AEI type zeolite having a Si/Al ratio of 50 or less includes: preparing a mixture including a silicon atom material, an aluminum atom material, an alkali metal atom material, an organic structure-directing agent, and water; and performing hydrothermal synthesis of the obtained mixture, in which a compound having a Si content of 20% by weight or less and containing aluminum is used as the aluminum atom material; and the mixture includes a zeolite having a framework density of 14 T/1000 ?3 or more in an amount of 0.1% by weight or more with respect to SiO2 assuming that all Si atoms in the mixture are formed in SiO2.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: July 23, 2019
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Manabu Tanaka, Takahiko Takewaki, Takeshi Matsuo, Masahiro Hara
  • Patent number: 10329229
    Abstract: The present invention aims at providing a method for producing a high-concentration alcohol from a water-alcohol mixture, in which the overall process is efficient and the present invention relates to a production method of a high-concentration alcohol, including a water adsorption step of adsorbing water of a water-alcohol mixture on an adsorption column to obtain a first concentrated alcohol, a water desorption step of introducing an alcohol to obtain a hydrous alcohol, and a membrane separation step of introducing the hydrous alcohol into a membrane separation unit provided with a membrane composite containing zeolite having an SiO2/Al2O3 molar ratio of 5 to 15 to obtain a second concentrated alcohol.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: June 25, 2019
    Assignees: MITSUBISHI CHEMICAL CORPORATION, Mitsubishi Chemical Engineering Corporation
    Inventors: Kazuhide Maeda, Koichi Yamazaki, Hiroyuki Kakiuchi, Takeshi Tahara, Takahiko Takewaki
  • Patent number: 10308516
    Abstract: Provided is a method for continuous production of zeolite in which a starting material is continuously supplied to a tubular reactor to produce an aluminophosphate zeolite that contains, in the framework structure, at least aluminum atoms and phosphorus atoms or an aluminosilicate zeolite having 5?SiO2/Al2O3?2000. The tubular reactor is heated using a heat medium; a ratio (volume)/(lateral surface area) of the volume (inner capacity) to the lateral surface area of the tubular reactor is 0.75 cm or smaller; and seed crystals are added to the starting material. Through using a small-diameter tubular reactor and heating with a heat medium, it becomes possible to heat sufficiently the entirety of a starting material (zeolite precursor gel) in a short time, and to allow reaction to proceed at a high rate. The occurrence of irregular pressure fluctuations during continuous production of the zeolite can be prevented by adding seed crystals.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: June 4, 2019
    Assignees: MITSUBISHI CHEMICAL CORPORATION, THE UNIVERSITY OF TOKYO
    Inventors: Tatsuya Okubo, Toru Wakihara, Zhendong Liu, Takahiko Takewaki, Kazunori Oshima, Daisuke Nishioka
  • Publication number: 20180369746
    Abstract: The present invention addresses the problem of providing a technology for efficiently separating carbon dioxide in a method for separating carbon dioxide from a mixed gas by using a membrane separation method. The problem is solved by a method including supplying a mixed gas to a separation membrane module to separate carbon dioxide from the mixed gas, in which the mixed gas is supplied to the separation membrane module at a high linear velocity in order to sufficiently mix a mixed gas in the vicinity of a membrane.
    Type: Application
    Filed: September 4, 2018
    Publication date: December 27, 2018
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Mikio HAYASHI, Takahiko TAKEWAKI, Nobuhiko UENO
  • Publication number: 20180339272
    Abstract: A zeolite membrane composite for use in separation of a highly-permeative component through permeation from a vapor mixture or a liquid mixture comprising multiple components, the zeolite membrane composite comprising an inorganic porous support and a zeolite membrane provided thereon, wherein the zeolite membrane contains zeolite of a CHA-type aluminosilicate, and in a X-ray diffraction pattern obtained through irradiation to the zeolite membrane surface with X-ray, a peak intensity at around 2?=17.90 has a value of less than 0.5 times a peak intensity at around 2?=20.80 and a peak intensity at around 2?=9.6° has a value of 2.0 times or more and less than 4.0 times a peak intensity at around 2?=20.8°.
    Type: Application
    Filed: July 30, 2018
    Publication date: November 29, 2018
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Mikio Hayashi, Miki Yamada, Takahiko Takewaki
  • Publication number: 20180250663
    Abstract: To provide methods for efficiently producing an 8-membered oxygen ring zeolite and an AEI-type zeolite at a low cost, with an organic structure-directing agent that is inexpensive and easily available industrially without using an expensive organic structure-directing agent, such as a cyclic quaternary ammonium salt.
    Type: Application
    Filed: May 2, 2018
    Publication date: September 6, 2018
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Yuusuke HOTTA, Manabu TANAKA, Takahiko TAKEWAKI, Takeshi MATSUO
  • Publication number: 20180178205
    Abstract: Provided is a method for producing a transition-metal-containing silicoaluminophosphate that is highly suitable as a catalyst or an adsorbent and has excellent high-temperature hydrothermal durability and excellent water resistance, that is, excellent durability against water submersion (water-submersion durability), in a simple and efficient manner. A method for producing a transition-metal-containing zeolite, the method comprising a steam treatment step in which a transition-metal-containing zeolite is stirred at 710° C. or more and 890° C. or less in the presence of water vapor, the transition-metal-containing zeolite containing a transition metal in a zeolite having a framework structure including silicon atoms, phosphorus atoms, and aluminium atoms.
    Type: Application
    Filed: February 27, 2015
    Publication date: June 28, 2018
    Applicant: Mitsubishi Plastics, Inc.
    Inventors: Takahide KIMURA, Yuusuke HOTTA, Kenichi KIYONO, Takahiko TAKEWAKI, Takeshi MATSUO
  • Publication number: 20180117572
    Abstract: Disclosed herein is a copper-supported zeolite containing a zeolite having a framework structure including silicon atoms, phosphorus atoms, and aluminum atoms, and copper supported on the zeolite, wherein the copper-supported zeolite satisfies (1) to (3): (1) an amount of copper (in terms of copper atoms) supported on the copper-supported zeolite is 1.5% by weight or more and 3.5% by weight or less, (2) the copper-supported zeolite has an UV-Vis-NIR absorption intensity ratio of less than 0.35 as determined by a formula (I) below: Intensity (22,000 cm?1)/Intensity (12,500 cm?1) . . . (I), and (3) a silicon atom content of the copper-supported zeolite satisfies a formula (II) below: 0.07?x?0.11 . . . . (II) where x represents a ratio of the number of moles of the silicon atoms to the total number of moles of the silicon atoms, the aluminum atoms, and the phosphorus atoms contained in the framework structure of the copper-supported zeolite.
    Type: Application
    Filed: December 27, 2017
    Publication date: May 3, 2018
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Yuusuke Hotta, Takahiko Takewaki, Takeshi Matsuo, Kenichi Kiyono
  • Patent number: 9919297
    Abstract: The present invention provides a novel high-silica zeolite having a high molar ration of a tetravalent element (Y) to a trivalent element (X) in terms of oxide. A zeolite, comprising at least a trivalent element X and a tetravalent element Y, wherein a molar ratio n=YO2/X2O3 in terms of oxide is 9.5 or more, and the zeolite comprises an RHO-type structure, or comprising at least a trivalent element X and a tetravalent element Y, wherein a molar ratio n=YO2/X2O3 in terms of oxide is 9.5 or more, and a characteristic X-ray diffraction pattern. This zeolite is produced by hydrothermal synthesis of a zeolite from an aqueous gel that is prepared by adding a mixed solution comprising a crown ether, an alkali, and water to a solution containing an aluminum atom material, and by then dropwise adding a liquid containing a silicon atom material.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: March 20, 2018
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Haijun Chen, Takahiko Takewaki, Takeshi Matsuo
  • Publication number: 20170259214
    Abstract: An object of the present invention is to provide a porous support-zeolite membrane composite ensuring that at the time of separation or concentration with a zeolite membrane, both sufficient throughput and high separation performance are achieved in practice and the present invention relates to a porous support-zeolite membrane composite having a porous support and a zeolite membrane formed on the porous support, wherein part of the zeolite membrane penetrates into the inside of the porous support and the distance from the surface of the porous support to the inside into which the zeolite film penetrates is 5.0 ?m or less on average.
    Type: Application
    Filed: May 23, 2017
    Publication date: September 14, 2017
    Applicant: Mitsubishi Chemical Corporation
    Inventors: Ayuko ONOZUKA, Miki YAMADA, Mikio HAYASHI, Takahiko TAKEWAKI
  • Publication number: 20170259250
    Abstract: Provided is a method for producing an inexpensive, high-performance AEI type zeolite and an AEI type zeolite having a Si/Al ratio of 6.5 or less by using neither an expensive Y type zeolite as a raw material nor dangerous hydrofluoric acid. The method for producing an AEI type zeolite having a Si/Al ratio of 50 or less includes: preparing a mixture including a silicon atom material, an aluminum atom material, an alkali metal atom material, an organic structure-directing agent, and water; and performing hydrothermal synthesis of the obtained mixture, in which a compound having a Si content of 20% by weight or less and containing aluminum is used as the aluminum atom material; and the mixture includes a zeolite having a framework density of 14 T/1000 ?3 or more in an amount of 0.1% by weight or more with respect to SiO2 assuming that all Si atoms in the mixture are formed in SiO2.
    Type: Application
    Filed: May 22, 2017
    Publication date: September 14, 2017
    Applicant: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Manabu TANAKA, Takahiko TAKEWAKI, Takeshi MATSUO, Masahiro HARA
  • Patent number: 9753188
    Abstract: The invention relates to an inorganic-organic hybrid material which comprises an inorganic component and an organic component, has a content of the inorganic component of 20-80% by mass, and has a refractive index of 1.60 or higher, wherein, when preparing a strip specimen having a thickness of 1,000 ?m, a width of 5 mm and a length of 70 mm by using the inorganic-organic hybrid material and winding the specimen by 180° on a cylindrical metal rod having a diameter of 10 mm at 25° C., the specimen does not crack.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: September 5, 2017
    Assignee: NIPPON KASEI CHEMICAL COMPANY LIMITED
    Inventors: Masanori Yamazaki, Takahiko Takewaki, Ritsuko Yamauchi, Yuuichi Katou, Atsushi Takaki