Patents by Inventor Tetsuo Nakajo
Tetsuo Nakajo 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: 8338327Abstract: An allyl acetate production catalyst comprising at least (a) palladium, (b) gold, (c) a compound containing at least one element selected from copper, nickel, zinc and cobalt, (d) an alkali metal salt compound and (e) a carrier, is produced by a process comprising step 1 in which a homogeneous solution of a palladium-containing compound and a gold-containing compound is supported on a carrier by contact therewith, step 2 in which the carrier obtained in step 1 is contacted with an alkali solution for impregnation, step 3 in which the carrier obtained in step 2 is subjected to reduction treatment, and step 4 in which a compound containing at least one element selected from copper, nickel, zinc and cobalt and an alkali metal salt compound are supported onto the carrier obtained in step 3. The obtained allyl acetate production catalyst has minimal reduction in activity and improved selectivity, when used for production of allyl acetate from propylene, oxygen and acetic acid.Type: GrantFiled: April 9, 2008Date of Patent: December 25, 2012Assignee: Showa Denko K.K.Inventors: Etsuko Kadowaki, Wataru Oguchi, Tetsuo Nakajo, Yasuhiro Iwama
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Publication number: 20100099903Abstract: An allyl acetate production catalyst comprising at least (a) palladium, (b) gold, (c) a compound containing at least one element selected from copper, nickel, zinc and cobalt, (d) an alkali metal salt compound and (e) a carrier, is produced by a process comprising step 1 in which a homogeneous solution of a palladium-containing compound and a gold-containing compound is supported on a carrier by contact therewith, step 2 in which the carrier obtained in step 1 is contacted with an alkali solution for impregnation, step 3 in which the carrier obtained in step 2 is subjected to reduction treatment, and step 4 in which a compound containing at least one element selected from copper, nickel, zinc and cobalt and an alkali metal salt compound are supported onto the carrier obtained in step 3. The obtained allyl acetate production catalyst has minimal reduction in activity and improved selectivity, when used for production of allyl acetate from propylene, oxygen and acetic acid.Type: ApplicationFiled: April 9, 2008Publication date: April 22, 2010Applicant: SHOWDA DENKO K.K.Inventors: Etsuko Kadowaki, Wataru Oguchi, Tetsuo Nakajo, Yasuhiro Iwana
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Publication number: 20100087692Abstract: The present invention provides a hydrogenation method capable of converting cracked kerosene into the raw materials for petrochemical cracking having a high thermal decomposition yield by a hydrogenation reaction. The present invention is a petrochemical process for producing at least any of ethylene, propylene, butane, benzene or toluene by carrying out a thermal decomposition reaction at least using naphtha for the main raw material, wherein cracked kerosene produced from a thermal cracking furnace is hydrogenated using a Pd or Pt catalyst in a two-stage method consisting of a first stage (I), in which a hydrogenation reaction is carried out within the range of 50 to 180° C., and a second stage (II), in which a hydrogenation reaction is carried out within the range of 230 to 350° C., followed by re-supplying all or a portion of these hydrogenated hydrocarbons to a thermal cracking furnace.Type: ApplicationFiled: April 14, 2008Publication date: April 8, 2010Applicant: SHOWA DENKO K.K.Inventors: Yuuji Yoshimura, Makoto Toba, Yasuo Miki, Masako Miki, Shigeru Hatanaka, Tetsuo Kudo, Tetsuo Nakajo
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Publication number: 20060234859Abstract: A process for producing a catalyst for the production of acetic acid, used in a process for producing acetic acid from ethylene and oxygen and comprising a support having supported thereon palladium and at least one compound selected from the group consisting of heteropolyacids and salts thereof, where a catalyst capable of ensuring production of acetic acid with higher activity and less reduction in the performance accompanying changes in aging can be obtained, wherein palladium is loaded in parts and through at least two steps.Type: ApplicationFiled: July 16, 2004Publication date: October 19, 2006Inventors: Yoshiaki Obana, Meiko Saihata, Seiji Sato, Kenji Yamada, Tetsuo Nakajo
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Patent number: 7115782Abstract: There is provided a process for producing an aromatic compound by Friedel-Crafts reaction product, which comprises reacting an aromatic compound with an ester compound in the presence of a heteropolyacid-containing solid acid catalyst.Type: GrantFiled: May 15, 2003Date of Patent: October 3, 2006Assignee: Showa Denko K.K.Inventors: Toshio Okuhara, Tetsuo Nakajo
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Publication number: 20050222457Abstract: There is provided a process for producing an aromatic compound by Friedel-Crafts reaction product, which comprises reacting an aromatic compound with an ester compound in the presence of a heteropolyacid-containing solid acid catalyst.Type: ApplicationFiled: May 15, 2003Publication date: October 6, 2005Inventors: Toshio Okuhara, Tetsuo Nakajo
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Patent number: 6274782Abstract: A purification method for purifying hexafluoroethane, comprising a step of making hexafluoroethane containing impurities of hydrofluorocarbons including two carbon atoms in a molecule contact a zeolite having a mean micropore size in a range of 3.5 Å to 11 Å and a silicon/aluminum ratio of not more than 1.5 or an adsorbent comprising the above-described zeolite and a carbonaceous adsorbent having a mean micropore size in a range of 3.5 Å to 11 Å, thereby reducing said hydrofluorocarbons.Type: GrantFiled: March 13, 2000Date of Patent: August 14, 2001Assignee: Showa Denko K.K.Inventors: Hiromoto Ohno, Tetsuo Nakajo, Toshio Ohi, Tatsuharu Arai
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Patent number: 6162957Abstract: A method for decomposing a perfluorocarbon in the presence of water vapor or water vapor and molecular oxygen in gas phase, in which a catalyst of a phosphate comprising at least one element selected from the group consisting of aluminum, boron, alkali earth metal, titanium, zirconium, lanthanum, cerium, yttrium, rare earth metal, vanadium, niobium, chromium, manganese, iron, cobalt and nickel, and phosphorus oxide, is used.Type: GrantFiled: January 18, 2000Date of Patent: December 19, 2000Assignee: Showa Denko K.K.Inventors: Tetsuo Nakajo, Masatoshi Hotta, Hiromoto Ohno, Toshio Ohi, Yusaku Takita
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Patent number: 6027705Abstract: A method for producing tri- or higher-silane from mono- or lower-silane characterized by reacting a lower silane in the first reaction zone and reacting a portion or all of the reaction product thereof in a reaction zone of the second or subsequent reaction zone.Type: GrantFiled: November 30, 1998Date of Patent: February 22, 2000Assignee: Showa Denko K.K.Inventors: Yu Kitsuno, Kotaro Yano, Syoichi Tazawa, Shinya Matsuhira, Tetsuo Nakajo
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Patent number: 6023007Abstract: A method for decomposing a perfluorocarbon in the presence of water vapor or water vapor and molecular oxygen in gas phase, in which a catalyst of a phosphate comprising at least one element selected from the group consisting of aluminum, boron, alkali earth metal, titanium, zirconium, lanthanum, cerium, yttrium, rare earth metal, vanadium, niobium, chromium, manganese, iron, cobalt and nickel, and phosphorus oxide, is used.Type: GrantFiled: March 23, 1998Date of Patent: February 8, 2000Assignee: Showa Denko K.K.Inventors: Tetsuo Nakajo, Hiromoto Ohno, Toshio Ohi, Yusaku Takita
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Patent number: 5892134Abstract: A production method of perfluorocarbon comprising a main reaction step of making a hydrofluorocarbon and fluorine gas of raw materials react in vapor phase with each other to obtain a reaction product gas containing a perfluorocarbon and residual fluorine gas, and a fluorine gas removing step of making the reaction product gas effluent from the main reaction step contact a hydrofluorocarbon having a chemical equivalent not less than 1.1 mol times a chemical equivalent of the fluorine gas contained in the reaction product gas, thereby removing the fluorine gas.Type: GrantFiled: December 31, 1997Date of Patent: April 6, 1999Assignee: Showa Denko K.K.Inventors: Hiromoto Ohno, Tetsuo Nakajo, Toshio Ohi, Tatsuharu Arai
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Patent number: 5714648Abstract: A process for producing tetrafluoromethane which comprises reacting a hydrofluorocarbon containing one carbon atom in the molecule with fluorine gas at an elevated temperature in a vapor phase in the presence of a diluent gas.Type: GrantFiled: April 10, 1996Date of Patent: February 3, 1998Assignee: Showa Denko K.K.Inventors: Hiromoto Ohno, Tetsuo Nakajo, Tatsuharu Arai, Toshio Ohi
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Patent number: 5710351Abstract: A process for producing hexafluoroethane which comprises reacting a hydrofluorocarbon containing two carbon atoms in the molecule with fluorine gas at an elevated temperature in a vapor phase in the presence of a diluent gas.Type: GrantFiled: April 10, 1996Date of Patent: January 20, 1998Assignee: Showa Denko K.K.Inventors: Hiromoto Ohno, Tetsuo Nakajo, Tatsuharu Arai, Toshio Ohi
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Patent number: 5675046Abstract: A process for producing perfluorocarbons which comprises a step of contacting a hydrofluorocarbon with fluorine gas in a vapor phase at an elevated reaction temperature in a first reaction zone to obtain a gaseous reaction mixture; and a step of introducing the gaseous reaction mixture as a diluent gas into a second reaction zone and contacting the same therein at an elevated reaction temperature with a hydrofluorocarbon fed to the second reaction zone if necessary together with fluorine gas, the hydrofluorocarbon fed to the second reaction zone being different from the hydrofluorocarbon reacted in the first reaction zone.Type: GrantFiled: April 10, 1996Date of Patent: October 7, 1997Assignee: Showa Denko K.K.Inventors: Hiromoto Ohno, Tetsuo Nakajo, Tatsuharu Arai, Toshio Ohi
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Patent number: 5569795Abstract: A fluorination catalyst comprising indium, chromium, oxygen and fluorine as essential constituent elements thereof. The catalyst is prepared by fluorinating a catalyst precursor comprising indium and chromium elements by bringing it into contact with hydrogen fluoride or a fluorine-containing halogenated hydrocarbon at a temperature of 300.degree. to 500.degree. C. A halogenated hydrocarbon is fluorinated by bringing it into contact with hydrogen fluoride in a gaseous phase in the presence of the catalyst.Type: GrantFiled: November 7, 1995Date of Patent: October 29, 1996Assignee: Showa Denko K. K.Inventors: Katsuyuki Tsuji, Kimitaka Oshiro, Tetsuo Nakajo
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Patent number: 5494877Abstract: To produce hydrofluorocarbons with high productivity, and to provide a catalyst for that purpose and a production method of the catalyst, there is provided a chromium-based fluorination catalyst comprising Cr, Ga, O and F as the essential constituent elements, wherein a Ga/Cr atomic ratio is from 0.001 to 0.15. The catalyst is prepared by particularly fluorinating a precursor of an oxide or a hydroxide. HF and a halogenated hydrocarbon are brought into contact in a gaseous phase in the presence of this catalyst.Type: GrantFiled: December 1, 1994Date of Patent: February 27, 1996Assignee: Showa Denko K. K.Inventors: Katsuyuki Tsuji, Tetsuo Nakajo
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Patent number: 5494873Abstract: A halogenated hydrocarbon having 1 to 4 carbon atoms is brought into contact with hydrogen fluoride in a gaseous phase in the presence of a catalyst prepared by firing a substance composed mainly of chromium(III) hydroxide in the presence of hydrogen at a temperature of 350.degree. to 500.degree. C. or a catalyst prepared by heat-treating the above substance in an inert gas stream at a temperature of 100.degree. to 600.degree. C. and then firing the heat-treated substance in the presence of hydrogen at the above temperature or any one of catalysts prepared by partially fluorinating the above catalysts.Type: GrantFiled: September 7, 1994Date of Patent: February 27, 1996Assignee: Showa Denko K.K.Inventors: Katsuyuki Tsuji, Tetsuo Nakajo
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Patent number: 5494876Abstract: A fluorination catalyst comprising indium, chromium, oxygen and fluorine as essential constituent elements thereof. The catalyst is prepared by fluorinating a catalyst precursor comprising indium and chromium elements by bringing it into contact with hydrogen fluoride or a fluorine-containing halogenated hydrocarbon at a temperature of 300.degree. to 500.degree. C. A halogenated hydrocarbon is fluorinated by bringing it into contact with hydrogen fluoride in a gaseous phase in the presence of the catalyst.Type: GrantFiled: June 20, 1994Date of Patent: February 27, 1996Assignee: Showa Denko K.K.Inventors: Katsuyuki Tsuji, Kimitaka Oshiro, Tetsuo Nakajo
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Patent number: 4568699Abstract: A catalyst comprising a combination of rhodium, iridium and lithium supported on a carrier having a specific surface area of more than 150 m.sup.2 /g is disclosed for producing two carbon atom oxygenerated compounds from carbon monoxide. The catalyst has high catalytic activity and high selectivity to acetic acid.Type: GrantFiled: May 30, 1985Date of Patent: February 4, 1986Assignee: Agency of Industrial Science and TechnologyInventors: Ken-ichi Sano, Yukimitsu Mita, Shinya Matsuhira, Tetsuo Nakajo, Hitoshi Iijima
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Patent number: 4420420Abstract: A rhodium catalyst containing supported rhodium metal omnipresent in the surface layer or in the neighborhood of the surface layer of the particles of a silica or titania type support is presented. This catalyst is prepared by a method (i) in which the support is dipped into an aqueous solution of a water-soluble rhodium salt previously adjusted to pH of at least 10, followed by the drying and reduction, or a method (ii) in which the support is first dipped into an aqueous solution of a water-soluble rhodium salt having a pH of 1 or less and, then, dipped into an aqueous alkaline solution containing an alkaline compound in an amount sufficient to neutralize the acid impregnated in the support and also sufficient to convert the rhodium salt impregnated in the support into rhodium hydroxide, followed by the drying and reduction.Type: GrantFiled: July 14, 1982Date of Patent: December 13, 1983Assignee: Showa Denko Kabushiki KaishaInventors: Yukimitsu Mita, Ken-ichi Sano, Shinya Matsuhira, Tetsuo Nakajo