Patents by Inventor Kenji Akagishi
Kenji Akagishi 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).
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Patent number: 11406969Abstract: A metal oxide catalyst, which has a bulk composition represented by formula (1) below and which is used to produce a conjugated diolefin by an oxidative dehydrogenation reaction between a monoolefin, having 4 or more carbon atoms, and molecular oxygen, wherein standard deviation obtained by dividing a ratio of Bi molar concentration relative to Mo molar concentration at the surface of a catalyst particle by a ratio of the Bi molar concentration relative to the Mo molar concentration in a catalyst bulk is 0.3 or less.Type: GrantFiled: May 24, 2017Date of Patent: August 9, 2022Assignee: ASAHI KASEI KABUSHIKI KAISHAInventors: Miho Naritomi, Kenji Akagishi, Hiroyuki Yanagi, Hiroyuki Yano
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Publication number: 20190118166Abstract: A metal oxide catalyst, which has a bulk composition represented by formula (1) below and which is used to produce a conjugated diolefin by an oxidative dehydrogenation reaction between a monoolefin, having 4 or more carbon atoms, and molecular oxygen, wherein standard deviation obtained by dividing a ratio of Bi molar concentration relative to Mo molar concentration at the surface of a catalyst particle by a ratio of the Bi molar concentration relative to the Mo molar concentration in a catalyst bulk is 0.3 or less.Type: ApplicationFiled: May 24, 2017Publication date: April 25, 2019Applicant: ASAHI KASEI KABUSHIKI KAISHAInventors: Miho NARITOMI, Kenji AKAGISHI, Hiroyuki YANAGI, Hiroyuki YANO
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Patent number: 9670110Abstract: A method for producing propylene, the method contains: producing a silica composite by preparing a raw material mixture containing silica and zeolite; drying the raw material mixture to obtain a dried product; and calcining the dried product; wherein the method contains the step of bringing a solution of phosphate into contact with the zeolite and/or the dried product to thereby adjust a phosphorus content in the silica composite to 0.01 to 1.0% by mass based on the total mass of the silica composite, a source of the phosphorus is phosphate, and the zeolite is of MFI type and has a SiO2/Al2O3 ratio (by mol) of 20 or more; and bringing the silica composite into contact with a hydrocarbon source containing at least one component selected from the group consisting of ethylene, ethanol, methanol, and dimethyl ether in the presence of steam.Type: GrantFiled: November 21, 2016Date of Patent: June 6, 2017Assignee: ASAHI KASEI KABUSHIKI KAISHAInventors: Kenji Akagishi, Ryusuke Miyazaki
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Patent number: 9643167Abstract: The present invention provides a zeolite-containing catalyst having excellent shape, fluidity and mechanical strength as a catalyst for a fluidized bed reaction. The present invention provides a zeolite-containing catalyst which is a particulate catalyst containing zeolite and silica, wherein the catalyst has an average particle diameter of 20 to 300 ?m and the ratio of the void area in the cross-section of the particle is 30% or less relative to the cross-section area of the particle.Type: GrantFiled: February 20, 2015Date of Patent: May 9, 2017Assignee: ASAHI KASEI CHEMICALS CORPORATIONInventors: Kenji Akagishi, Hiroyuki Yano, Ryusuke Miyazaki
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Publication number: 20170066699Abstract: A method for producing propylene, the method contains: producing a silica composite by preparing a raw material mixture containing silica and zeolite; drying the raw material mixture to obtain a dried product; and calcining the dried product; wherein the method contains the step of bringing a solution of phosphate into contact with the zeolite and/or the dried product to thereby adjust a phosphorus content in the silica composite to 0.01 to 1.0% by mass based on the total mass of the silica composite, a source of the phosphorus is phosphate, and the zeolite is of MFI type and has a SiO2/Al2O3 ratio (by mol) of 20 or more; and bringing the silica composite into contact with a hydrocarbon source containing at least one component selected from the group consisting of ethylene, ethanol, methanol, and dimethyl ether in the presence of steam.Type: ApplicationFiled: November 21, 2016Publication date: March 9, 2017Applicant: ASAHI KASEI KABUSHIKI KAISHAInventors: Kenji AKAGISHI, Ryusuke MIYAZAKI
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Patent number: 9527064Abstract: The present invention provides a method for producing a silica composite by the steps of: preparing a raw material mixture containing silica and zeolite; drying the raw material mixture to obtain a dried product; and calcining the dried product, wherein the method comprising the step of allowing the raw material mixture to contain phosphoric acid and/or phosphate or bringing a solution of phosphoric acid and/or phosphate into contact with the zeolite and/or the dried product, or a combination thereof to thereby adjust a phosphorus content in the silica composite to 0.01 to 1.0% by mass based on the total mass of the silica composite.Type: GrantFiled: November 24, 2011Date of Patent: December 27, 2016Assignee: ASAHI KASEI KABUSHIKI KAISHAInventors: Kenji Akagishi, Ryusuke Miyazaki
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Publication number: 20160016864Abstract: A process for producing butadiene from a monoolefin having 4 carbon atoms by a vapor-phase catalytic oxidation reaction in a fluidized bed reactor, including a first step of producing the butadiene by bringing the monoolefin having 4 carbon atoms into contact with a catalyst and a second step of removing a part of the catalyst from the fluidized bed reactor while the vapor-phase catalytic oxidation reaction is proceeding, regenerating the catalyst removed, and feeding the regenerated catalyst to the fluidized bed reactor while the vapor-phase catalytic oxidation reaction is proceeding, wherein a ratio of an amount (kg/hr) of the regenerated catalyst fed to an amount (kg/hr) of the monoolefin having 4 carbon atoms fed is 0.3% or more.Type: ApplicationFiled: March 26, 2014Publication date: January 21, 2016Applicant: ASAHI KASEI CHEMICALS CORPORATIONInventors: Kenji AKAGISHI, Hiroyuki YANAGI, Mamoru WATANABE, Fukiko YOSHINO, Hideo MIDORIKAWA
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Patent number: 9192922Abstract: The present invention provides a process for producing propylene, comprising contacting at least one of raw material selected from the group consisting of ethylene and ethanol with a catalyst containing a medium pore diameter zeolite in a fluidized bed reactor wherein the catalyst containing the medium pore diameter zeolite satisfies the following (a) through (e): (a) a particle diameter of catalyst particles at 90% by weight or more is within a range of 10 to 197 ?m; (b) a bulk density of the catalyst particles is within a range of 0.7 to 1.1 g/cm3; (c) a mean compressive strength of the catalyst particles having a particle diameter within a range of 30 to 70 ?m is 15 MPa or more, and a compressive strength of the catalyst particles at 90% by weight or more is 10 MPa or more; (d) an angle of repose is 20 to 30°; and (e) a pore volume of pores having a pore radius within a range of 2000 to 20000 nm is 0.050 cc/g or less.Type: GrantFiled: September 9, 2008Date of Patent: November 24, 2015Assignee: ASAHI KASEI CHEMICALS CORPORATIONInventors: Hideo Midorikawa, Takashi Tsunoda, Kenji Akagishi, Hiroyuki Yano, Ryusuke Miyazaki
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Publication number: 20150165425Abstract: The present invention provides a zeolite-containing catalyst having excellent shape, fluidity and mechanical strength as a catalyst for a fluidized bed reaction. The present invention provides a zeolite-containing catalyst which is a particulate catalyst containing zeolite and silica, wherein the catalyst has an average particle diameter of 20 to 300 ?m and the ratio of the void area in the cross-section of the particle is 30% or less relative to the cross-section area of the particle.Type: ApplicationFiled: February 20, 2015Publication date: June 18, 2015Inventors: Kenji AKAGISHI, Hiroyuki YANO, Ryusuke MIYAZAKI
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Patent number: 8993469Abstract: The present invention provides a zeolite-containing catalyst having excellent shape, fluidity and mechanical strength as a catalyst for a fluidized bed reaction. The present invention provides a zeolite-containing catalyst which is a particulate catalyst containing zeolite and silica, wherein the catalyst has an average particle diameter of 20 to 300 ?m and the ratio of the void area in the cross-section of the particle is 30% or less relative to the cross-section area of the particle.Type: GrantFiled: June 25, 2009Date of Patent: March 31, 2015Assignee: Asahi Kasei Chemicals CorporationInventors: Kenji Akagishi, Hiroyuki Yano, Ryusuke Miyazaki
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Publication number: 20130231515Abstract: The present invention provides a method for producing a silica composite by the steps of: preparing a raw material mixture containing silica and zeolite; drying the raw material mixture to obtain a dried product; and calcining the dried product, wherein the method comprising the step of allowing the raw material mixture to contain phosphoric acid and/or phosphate or bringing a solution of phosphoric acid and/or phosphate into contact with the zeolite and/or the dried product, or a combination thereof to thereby adjust a phosphorus content in the silica composite to 0.01 to 1.0% by mass based on the total mass of the silica composite.Type: ApplicationFiled: November 24, 2011Publication date: September 5, 2013Applicant: ASAHI KASEI CHEMICALS CORPORATIONInventors: Kenji Akagishi, Ryusuke Miyazaki
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Publication number: 20110092757Abstract: The present invention provides a zeolite-containing catalyst having excellent shape, fluidity and mechanical strength as a catalyst for a fluidized bed reaction. The present invention provides a zeolite-containing catalyst which is a particulate catalyst containing zeolite and silica, wherein the catalyst has an average particle diameter of 20 to 300 ?m and the ratio of the void area in the cross-section of the particle is 30% or less relative to the cross-section area of the particle.Type: ApplicationFiled: June 25, 2009Publication date: April 21, 2011Inventors: Kenji Akagishi, Hiroyuki Yano, Ryusuke Miyazaki
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Publication number: 20100197986Abstract: The present invention provides a process for producing propylene, comprising contacting at least one of raw material selected from the group consisting of ethylene and ethanol with a catalyst containing a medium pore diameter zeolite in a fluidized bed reactor wherein the catalyst containing the medium pore diameter zeolite satisfies the following (a) through (e): (a) a particle diameter of catalyst particles at 90% by weight or more is within a range of 10 to 197 ?m; (b) a bulk density of the catalyst particles is within a range of 0.7 to 1.1 g/cm3; (c) a mean compressive strength of the catalyst particles having a particle diameter within a range of 30 to 70 ?m is 15 MPa or more, and a compressive strength of the catalyst particles at 90% by weight or more is 10 MPa or more; (d) an angle of repose is 20 to 30°; and (e) a pore volume of pores having a pore radius within a range of 2000 to 20000 nm is 0.Type: ApplicationFiled: September 9, 2008Publication date: August 5, 2010Inventors: Hideo Midorikawa, Takashi Tsunoda, Kenji Akagishi, Hiroyuki Yano, Ryusuke Miyazaki
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Patent number: 7291755Abstract: The present invention relates to a method for producing an alcohol and/or a ketone from a corresponding alkene(s) in a gas phase in the presence of water vapor by the use of an oxide catalyst. According to the present invention, there is provided a method for producing an alcohol and/or a ketone by bringing a starting material containing an alkene(s), as a gas phase into contact with an oxide catalyst in the presence of water vapor to carry out the reaction, wherein the oxide catalyst satisfies the following requirements: (a) it comprises an oxide(s) of molybdenum and/or tin, and (b) the amount of carbonaceous substances accumulated on the oxide catalyst is controlled to be within a range of 0.1 to 10% by mass, during the reaction.Type: GrantFiled: December 25, 2003Date of Patent: November 6, 2007Assignee: Asahi Kasei Chemicals CorporationInventors: Takashi Tsunoda, Kenji Akagishi, Atusi Watanabe
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Publication number: 20070161824Abstract: A method for producing an alcohol and/or a ketone, wherein a raw material containing at least one alkene is reacted in the presence of steam under the contact with an oxide catalyst in a gas phase, to produce an alcohol and/or a ketone corresponding to said alkene(s), which comprises satisfying the following requirements: (a) the above oxide catalyst contains the oxide(s) of molybdenum and/or tin, (b) the above reaction is carried out under a condition wherein molecular oxygen is not fed and by the use of a system wherein said catalyst is circulated between a fluid bed reactor and a regenerator, and (c) a stripper is provided on the way from the regenerator to the reactor.Type: ApplicationFiled: February 8, 2005Publication date: July 12, 2007Inventors: Takashi Tsunoda, Kenji Akagishi, Atsushi Watanabe
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Publication number: 20060173220Abstract: The present invention relates to a method for producing an alcohol and/or a ketone from a corresponding alkene(s) in a gas phase in the presence of water vapor by the use of an oxide catalyst. According to the present invention, there is provided a method for producing an alcohol and/or a ketone by bringing a starting material containing an alkene(s), as a gas phase into contact with an oxide catalyst in the presence of water vapor to carry out the reaction, wherein the oxide catalyst satisfies the following requirements: (a) it comprises an oxide(s) of molybdenum and/or tin, and (b) the amount of carbonaceous substances accumulated on the oxide catalyst is controlled to be within a range of 0.1 to 10% by mass, during the reaction.Type: ApplicationFiled: December 25, 2003Publication date: August 3, 2006Inventors: Takashi Tsunoda, Kenji Akagishi, Atusi Watanabe
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Patent number: 6894163Abstract: ?-Caprolactam is produced by contacting cyclohexanone oxime with a solid acid catalyst in the gaseous phase to effect a rearrangement reaction of the cyclohexanone oxime. The solid acid catalyst is produced by calcining a dried catalyst precursor that can be a zeolite, a crystalline clay mineral and at least one substance selected from an inorganic oxide and a compound which forms the inorganic oxide by calcination. The inorganic oxide includes at least one element selected Groups 4, 13 and 14 of the Periodic Table, and the inorganic oxide excludes oxides contained in a crystalline form in the zeolite and the crystalline clay mineral. Alternately, the rearrangement reaction occurs in the presence of a polyhydric alcohol compound R1—O—R2—OH (where R1 represents C1-C5 alkyl or phenyl, and R2 represents C2-C5 alkylene).Type: GrantFiled: February 14, 2002Date of Patent: May 17, 2005Assignee: Asahi Kasei Kabushiki KaishaInventors: Takashi Tsunoda, Kenji Akagishi, Mitsuhiro Sekiguchi
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Publication number: 20040054169Abstract: In the production of &egr;-caprolactam by contacting cyclohexanone oxime with a solid acid catalyst in the gaseous phase to effect a rearrangement reaction of the cyclohexanone oxime, wherein the solid acid catalyst is produced by calcining a dried catalyst precursor: in a first aspect, the catalyst precursor comprises a zeolite, a crystalline clay mineral and at least one substance selected from the group consisting of an inorganic oxide and a compound which forms the inorganic oxide by calcination, wherein the inorganic oxide comprises an oxide of at least one element selected from the group consisting of elements belonging to Groups 4, 13 and 14 of the Periodic Table and wherein the inorganic oxide is other than oxides contained in a crystalline form in the zeolite and the crystalline clay mineral; or in a second aspect, the rearrangement reaction is effected in the presence of a polyhydric alcohol derivative represented by the following formula: R1—O—R2—OH (wherein: R1 represents a C1-C5Type: ApplicationFiled: July 22, 2003Publication date: March 18, 2004Inventors: Takashi Tsunoda, Kenji Akagishi, Mitsuhiro Sekiguchi