Patents by Inventor Nobuyuki Hakozaki

Nobuyuki Hakozaki 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: 8962881
    Abstract: The disclosed invention is a method for manufacturing an oxidized organic compound which includes a step of forming an oxidized organic compound, in use of a fixed-bed reactor having a reaction tube packed with an oxide catalyst, by supplying at least one type of organic compound as a reaction feedstock gas and using a molecular oxygen-containing gas to carry out a catalytic gas-phase oxidation reaction; and a step of stopping the catalytic gas-phase oxidation reaction. In the manufacturing method, when stopping the catalytic gas-phase oxidation reaction, the supply of the reaction feedstock gas is stopped, after which an inert gas is supplied to the reactor, then a molecular oxygen-containing gas is supplied, subsequent to which the supply of the molecular oxygen-containing gas to the reactor is stopped.
    Type: Grant
    Filed: March 9, 2009
    Date of Patent: February 24, 2015
    Assignee: Nippon Shokubai Co, Ltd
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Patent number: 8673245
    Abstract: A fixed-bed reactor containing a first catalyst layer filled with a first catalyst for producing acrolein from propylene; a second catalyst layer filled with a second catalyst for producing acrylic acid from acrolein; and an inert substance layer provided between the first catalyst layer and the second catalyst layer, and filled with an inert substance of a cylindrical shape having a surrounding wall in which an opening is formed. A process for producing acrylic acid containing the step of producing acrylic acid from propylene by using the aforementioned fixed-bed reactor.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: March 18, 2014
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Patent number: 8415498
    Abstract: In industrial scale production of acrolen and/or acrylic acid by catalytic gas-phase oxidation of propylene or a propylene-containing gas with molecular oxygen or a molecular oxygen-containing gas or in industrial scale production of acrylic acid by catalytic gas-phase oxidation of acrolein or an acrolein-containing gas with molecular oxygen or a molecular oxygen-containing gas, this invention provides a process characterized in that the initial stage operation is carried out under advancedly elevated reaction temperature and thereafter the reaction temperature is lowered to carry out the steady state operation. According to this process, acrolein and/or acrylic acid can be produced in high yield stably over prolonged period.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: April 9, 2013
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Publication number: 20110306788
    Abstract: The object of the present invention is to provide, in the production of a useful oxidized organic compound by a catalytic gas-phase oxidation reaction on an industrial scale, a manufacturing method which, even when operation has been temporarily interrupted for periodic inspection or emergency shutdown, fully avoids the danger of an explosion due to reaction feedstock gases and the like remaining inside the reaction apparatus, and which, when operation is restarted, is able to shorten, relative to the prior art, the period required for the reaction to return to a stable steady state, and moreover which, after operation has restarted, does not undergo a decrease in yield, and allows a high yield to be stably maintained over a long period, whereby the production efficiency can be greatly increased.
    Type: Application
    Filed: March 9, 2009
    Publication date: December 15, 2011
    Applicant: NIPPON SHOKUBAI CO., LTD.
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Publication number: 20110178334
    Abstract: The fixed-bed reactor of the present invention which solves the above problems is a fixed-bed reactor comprising: a first catalyst layer filled with a first catalyst for producing acrolein from propylene; a second catalyst layer filled with a second catalyst for producing acrylic acid from acrolein; and an inert substance layer provided between the first catalyst layer and the second catalyst layer, and filled with an inert substance of a cylindrical shape having a surrounding wall in which an opening is formed. The process for producing acrylic acid of the present invention is a process for producing acrylic acid comprising the step of producing acrylic acid from propylene by using the fixed-bed reactor of the present invention.
    Type: Application
    Filed: September 9, 2009
    Publication date: July 21, 2011
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Publication number: 20110166384
    Abstract: A catalyst for producing acrylic acid from propane and/or acrolein by gas-phase catalytic oxidation with molecular oxygen-containing gas, comprising a catalytic active component containing molybdenum and vanadium as essential elements, and having a crystallinity T of 5% or more and 20% or less in the 20 range of 5° to 90°, measured by an X-ray diffraction analysis with Cu-K? radiation; and a process for producing acrylic acid by gas-phase catalytic oxidation of propane and/or acrolein with molecular oxygen, comprising the step of conducting the gas-phase catalytic oxidation in the presence of the catalyst. According to the catalyst and the process for producing acrylic acid of the present invention, it is possible to stably produce acrylic acid at a high yield for a long period.
    Type: Application
    Filed: September 25, 2009
    Publication date: July 7, 2011
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Publication number: 20110112325
    Abstract: A catalyst for producing acrolein and/or acrylic acid from propylene by gas-phase catalytic oxidation with molecular oxygen-containing gas, comprising a catalytic active component containing molybdenum, bismuth and cobalt as essential elements, and having a crystallinity T of 4% or more and 18% or less in the 2? range of 5° to 90°, measured by an X-ray diffraction analysis with Cu—K? radiation; and a process for producing acrolein and/or acrylic acid by gas-phase catalytic oxidation of propylene with molecular oxygen, comprising the step of conducting the gas-phase catalytic oxidation in the presence of the catalyst. According to the catalyst and the process for producing acrolein and/or acrylic acid of the present invention, it is possible to stably produce acrolein and/or acrylic acid at a high yield for a long period.
    Type: Application
    Filed: September 25, 2009
    Publication date: May 12, 2011
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Patent number: 7897813
    Abstract: Conventional gas-phase catalytic oxidation reaction apparatus comprising two reactors for production of acrylic acid is subject to problems of high equipment costs for the reactors and piping, necessity for wide installation area and easy accumulation of carbides generated by autoxidation of acrolein. On the other hand, conventional reaction apparatus comprising a single reactor has the drawbacks that the composition of gas in the first stage reaction and in the second stage reaction cannot be optimized independently of each other, and that the allowable concentration of starting propylene is limited because of the risk of explosion.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: March 1, 2011
    Assignee: Nippon Shokubai Co., Ltd.
    Inventors: Michio Tanimoto, Daisuke Nakamura, Nobuyuki Hakozaki
  • Publication number: 20110017348
    Abstract: A method of loading solid particles into reaction tubes of a fixed-bed multitubular reactor, comprising the step of loading two or more kinds of solid particles into each of the reaction tubes so that the respective kinds of the solid particles are stacked in layers in a direction of an axis of the tube, wherein a gaseous fluid is introduced into the reaction tubes at least once every time the each kind of the solid particles is loaded in the layer.
    Type: Application
    Filed: June 18, 2009
    Publication date: January 27, 2011
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki, Yusaku Migita
  • Publication number: 20110015432
    Abstract: In industrial scale production of acrolen and/or acrylic acid by catalytic gas-phase oxidation of propylene or a propylene-containing gas with molecular oxygen or a molecular oxygen-containing gas or in industrial scale production of acrylic acid by catalytic gas-phase oxidation of acrolein or an acrolein-containing gas with molecular oxygen or a molecular oxygen-containing gas, this invention provides a process characterized in that the initial stage operation is carried out under advancedly elevated reaction temperature and thereafter the reaction temperature is lowered to carry out the steady state operation. According to this process, acrolein and/or acrylic acid can be produced in high yield stably over prolonged period.
    Type: Application
    Filed: March 11, 2009
    Publication date: January 20, 2011
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Publication number: 20100130777
    Abstract: As an improvement in the production method of acrylic acid by two-stage catalytic vapor-phase oxidation of propylene comprising catalytic vapor-phase oxidation of a propylene-containing gas at a first reactor to produce an acrolein-containing gas, and successive catalytic vapor-phase oxidation of the obtained product gas to produce acrylic acid, a process which enables acrylic acid production on an industrial scale for a long period, with stability at high yield is offered. This process is characterized in that a filler formed of a solid inert material is disposed at a cooling part which is provided on the downstream side to the direction of gas flow through the catalyst layer in the first reactor and/or on the gas outlet side of the first reactor, in such a way that the voidage in the filler becomes 45-99%.
    Type: Application
    Filed: July 18, 2008
    Publication date: May 27, 2010
    Inventors: Michio Tanimoto, Nobuyuki Hakozaki
  • Publication number: 20080021242
    Abstract: Conventional gas-phase catalytic oxidation reaction apparatus comprising two reactors for production of acrylic acid is subject to problems of high equipment costs for the reactors and piping, necessity for wide installation area and easy accumulation of carbides generated by autoxidation of acrolein. On the other hand, conventional reaction apparatus comprising a single reactor has the drawbacks that the composition of gas in the first stage reaction and in the second stage reaction cannot be optimized independently of each other, and that the allowable concentration of starting propylene is limited because of the risk of explosion.
    Type: Application
    Filed: July 17, 2007
    Publication date: January 24, 2008
    Inventors: Michio Tanimoto, Daisuke Nakamura, Nobuyuki Hakozaki