Patents by Inventor Tetsuo Koshitsuka
Tetsuo Koshitsuka 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: 9988269Abstract: The invention provides a method for producing a peroxymonosulfuric acid solution with high stability, including the steps of mixing 35 mass % or more of hydrogen peroxide and 70 mass % or more of sulfuric acid to react them, cooling the reaction solution to 80° C. or lower within five minutes after initiation of the mixing step, and diluting the reaction solution with water four times or more as much as the reaction solution by mass.Type: GrantFiled: October 1, 2015Date of Patent: June 5, 2018Assignee: MITSUBISHI GAS CHEMICAL CO., INC.Inventors: Kiyoshi Yoshida, Tetsuo Koshitsuka, Kaoru Tsuyuki, Wakana Uesugi
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Publication number: 20160046490Abstract: The invention provides a method for producing a peroxymonosulfuric acid solution with high stability, including the steps of mixing 35 mass % or more of hydrogen peroxide and 70 mass % or more of sulfuric acid to react them, cooling the reaction solution to 80° C. or lower within five minutes after initiation of the mixing step, and diluting the reaction solution with water four times or more as much as the reaction solution by mass.Type: ApplicationFiled: October 1, 2015Publication date: February 18, 2016Inventors: Kiyoshi YOSHIDA, Tetsuo KOSHITSUKA, Kaoru TSUYUKI, Wakana UESUGI
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Patent number: 9181094Abstract: The invention provides a method for producing a peroxymonosulfuric acid solution with high stability, including the steps of mixing 35 mass % or more of hydrogen peroxide and 70 mass % or more of sulfuric acid to react them, cooling the reaction solution to 80° C. or lower within five minutes after initiation of the mixing step, and diluting the reaction solution with water four times or more as much as the reaction solution by mass.Type: GrantFiled: October 18, 2007Date of Patent: November 10, 2015Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Kiyoshi Yoshida, Tetsuo Koshitsuka, Kaoru Tsuyuki, Wakana Uesugi
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Patent number: 8900408Abstract: Provided is a process for producing bleached pulp, including subjecting unbleached pulp, which is obtained by cooking a lignocellulose substance, to alkali-oxygen bleaching treatment and then subjecting the alkali-oxygen bleached pulp to chlorine-free bleaching treatment including chlorine dioxide treatment, wherein in at least one chlorine dioxide treatment stage in which the chlorine dioxide treatment is performed, monopersulfuric acid is used in combination. The amount of chlorine dioxide to be used is reduced and the color reversion resistance of the bleached pulp is improved by this process.Type: GrantFiled: December 5, 2008Date of Patent: December 2, 2014Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Kiyoshi Yoshida, Tetsuo Koshitsuka, Eiko Kuwabara, Takashi Ishii
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Patent number: 8864942Abstract: A method for producing bleached pulp, including processing unbleached pulp obtained by cooking a lignocellulose substance, followed by treatment with peroxomonosulfuric acid and thereafter by multistage chlorine-free bleaching treatment starting from chlorine dioxide treatment; a method for producing bleached pulp, including processing unbleached pulp for alkali-oxygen bleaching followed by chlorine-free bleaching treatment or totally chlorine-free bleaching treatment to bleach it to a degree of brightness of from 70 to 89%, and further followed by treatment with peroxomonosulfuric acid; and paper produced by the use of the bleached pulp produced according to these production methods, at a papermaking pH of at most 6.Type: GrantFiled: August 9, 2012Date of Patent: October 21, 2014Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Iori Tomoda, Yosuke Uchida, Hiroyuki Nagatani, Ayano Kawae, Takahiro Cho, Wakana Uesugi, Tetsuo Koshitsuka
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Publication number: 20130062026Abstract: A method for producing bleached pulp, including processing unbleached pulp obtained by cooking a lignocellulose substance, followed by treatment with peroxomonosulfuric acid and thereafter by multistage chlorine-free bleaching treatment starting from chlorine dioxide treatment; a method for producing bleached pulp, including processing unbleached pulp for alkali-oxygen bleaching followed by chlorine-free bleaching treatment or totally chlorine-free bleaching treatment to bleach it to a degree of brightness of from 70 to 89%, and further followed by treatment with peroxomonosulfuric acid; and paper produced by the use of the bleached pulp produced according to these production methods, at a papermaking pH of at most 6.Type: ApplicationFiled: August 9, 2012Publication date: March 14, 2013Inventors: Iori TOMODA, Yosuke UCHIDA, Hiroyuki NAGATANI, Ayano KAWAE, Takahiro CHO, Wakana UESUGI, Tetsuo KOSHITSUKA
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Patent number: 8268123Abstract: Provided are a method for producing bleached pulp, comprising processing unbleached pulp obtained by cooking a lignocellulose substance, for alkali-oxygen bleaching followed by treatment with peroxomonosulfuric acid and thereafter by multistage chlorine-free bleaching treatment starting from chlorine dioxide treatment; a method for producing bleached pulp, comprising processing the unbleached pulp for alkali-oxygen bleaching followed by chlorine-free bleaching treatment or totally chlorine-free bleaching treatment to bleach it to a degree of brightness of from 70 to 89%, and further followed by treatment with peroxomonosulfuric acid; and paper produced by the use of the bleached pulp produced according to these production methods, at a papermaking pH of at most 6.Type: GrantFiled: May 15, 2007Date of Patent: September 18, 2012Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Iori Tomoda, Yosuke Uchida, Hiroyuki Nagatani, Ayano Kawae, Takahiro Cho, Wakana Uesugi, Tetsuo Koshitsuka
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Publication number: 20100314056Abstract: Provided is a process for producing bleached pulp, including subjecting unbleached pulp, which is obtained by cooking a lignocellulose substance, to alkali-oxygen bleaching treatment and then subjecting the alkali-oxygen bleached pulp to chlorine-free bleaching treatment including chlorine dioxide treatment, wherein in at least one chlorine dioxide treatment stage in which the chlorine dioxide treatment is performed, monopersulfuric acid is used in combination. The amount of chlorine dioxide to be used is reduced and the colour reversion resistance of the bleached pulp is improved by this process.Type: ApplicationFiled: December 5, 2008Publication date: December 16, 2010Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Kiyoshi Yoshida, Tetsuo Koshitsuka, Eiko Kuwabara, Takashi Ishii
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Publication number: 20100112094Abstract: The invention provides a method for producing a peroxymonosulfuric acid solution with high stability, including the steps of mixing 35 mass % or more of hydrogen peroxide and 70 mass % or more of sulfuric acid to react them, cooling the reaction solution to 80° C. or lower within five minutes after initiation of the mixing step, and diluting the reaction solution with water four times or more as much as the reaction solution by mass.Type: ApplicationFiled: October 18, 2007Publication date: May 6, 2010Inventors: Kiyoshi Yoshida, Tetsuo Koshitsuka, Kaoru Tsuyuki, Wakana Uesugi
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Publication number: 20090183845Abstract: Provided are a method for producing bleached pulp, comprising processing unbleached pulp obtained by cooking a lignocellulose substance, for alkali-oxygen bleaching followed by treatment with peroxomonosulfuric acid and thereafter by multistage chlorine-free bleaching treatment starting from chlorine dioxide treatment; a method for producing bleached pulp, comprising processing the unbleached pulp for alkali-oxygen bleaching followed by chlorine-free bleaching treatment or totally chlorine-free bleaching treatment to bleach it to a degree of brightness of from 70 to 89%, and further followed by treatment with peroxomonosulfuric acid; and paper produced by the use of the bleached pulp produced according to these production methods, at a papermaking pH of at most 6.Type: ApplicationFiled: May 15, 2007Publication date: July 23, 2009Inventors: Iori Tomoda, Yosuke Uchida, Hiroyuki Nagatani, Ayano Kawae, Takahiro Cho, Wakana Uesugi, Tetsuo Koshitsuka
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Patent number: 6432266Abstract: A process for bleaching chemical pulp for paper manufacturing comprising delignifying and bleaching chemical pulp which has been treated by cooking by simultaneous use of chlorine dioxide, a peroxide, and at least one reaction catalyst selected from the group consisting of oxoacids of elements of Groups IV, V and VI and salts of these acids. Formation of organic chlorine compounds as by-products is suppressed by decreasing the amount of chlorine dioxide used in the ECF bleaching process in the first stage, and thus environmental toxicity in the waste water discharged from the bleaching process is decreased. Chemical pulp having a high degree of brightness is economically produced because increase in the production capacity is not required at all or suppressed to the minimum, and the investment cost is reduced to the minimum when the bleaching with chlorine in the first stage is converted into the bleaching with chlorine dioxide which is an ECF bleaching process.Type: GrantFiled: July 20, 2000Date of Patent: August 13, 2002Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Takamasa Fukushima, Tetsuo Koshitsuka, Yuh Miyauchi, Akiyo Shimada, Takahiro Cho
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Patent number: 6048437Abstract: A process for bleaching chemical pulp for paper manufacturing comprising delignifying and bleaching chemical pulp which has been treated by cooking by simultaneous use of chlorine dioxide, a peroxide, and at least one reaction catalyst selected from the group consisting of oxoacids of elements of Groups IV, V and VI and salts of these acids. Formation of organic chlorine compounds as by-products is suppressed by decreasing the amount of chlorine dioxide used in the ECF bleaching process in the first stage, and thus environmental toxicity in the waste water discharged from the bleaching process is decreased. Chemical pulp having a high degree of brightness is economically produced because increase in the production capacity is not required at all or suppressed to the minimum, and the investment cost is reduced to the minimum when the bleaching with chlorine in the first stage is converted into the bleaching with chlorine dioxide which is an ECF bleaching process.Type: GrantFiled: September 19, 1996Date of Patent: April 11, 2000Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Takamasa Fukushima, Tetsuo Koshitsuka, Yuh Miyauchi, Akiyo Shimada, Takahiro Cho
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Patent number: 5958184Abstract: A process for producing a thiourea dioxide fluid by mixing thiourea and a peroxide, or thiourea, a peroxide and a reaction catalyst, or thiourea, a peroxide, a reaction catalyst and a chelating agent, in the absence or presence of pulp and a process for bleaching pulp by the use of the thiourea dioxide fluid produced by the above process economically advantageously with a small chemicals loss and by small consumption of energy.Type: GrantFiled: January 29, 1998Date of Patent: September 28, 1999Assignee: Mitsubishi Gas Chemical Company Inc.Inventors: Toshiaki Kanada, Seikyu Jinnouchi, Masafumi Shimpo, Tetsuo Koshitsuka, Akiko Kimura