Patents by Inventor Takehiro Chaki
Takehiro Chaki 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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Publication number: 20170233315Abstract: This invention provides a method capable of efficiently producing 2,3,3,3-tetrafluoropropene (HFO-1234yf) with a recycling step using substantially a single reaction step. A method for producing 2,3,3,3-tetrafluoropropene (HFO-1234yf), comprising a reaction step of reacting at least one chlorine-containing starting compound selected from the group consisting of chlorine-containing alkanes represented by formula (1): CX2YCHClCH2Z (wherein X, Y and Z independently represent H, F or Cl) and chlorine-containing alkenes represented by formula (2): CX2YCCl?CZ2 (wherein X, Y and Z independently represent H, F or Cl) with a fluorinating agent, wherein the molar ratio of the chlorine-containing starting compound represented by formula (1) or (2) newly supplied to the reactor inlet is less than 1.2 relative to 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) in components obtained from the reactor outlet.Type: ApplicationFiled: July 7, 2015Publication date: August 17, 2017Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro CHAKI, Daisuke KARUBE
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Publication number: 20170217860Abstract: The present invention provides a method for producing a fluorine-containing haloolefin compound, said method being able to reduce the generation of overly fluorinated compounds as by-products in the production of the fluorine-containing haloolefin compound and produce the target product of high purity at a high yield. The invention also provides a halogenated hydrocarbon composition. The method for producing a haloolefin compound through the step of fluorinating a starting material containing at least one of a pentachloropropane or a tetrachloropropene in the presence of a fluorinating agent in a reactor, according to the present invention, includes the step of adding hydrogen chloride to the reactor. The composition according to the present invention contains: at least one member selected from the group consisting of a pentachloropropane and a tetrachloropropene; and hydrogen chloride.Type: ApplicationFiled: October 7, 2015Publication date: August 3, 2017Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke KARUBE, Masayuki KISHIMOTO, Yuzo KOMATSU, Takehiro CHAKI
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Publication number: 20170217859Abstract: This invention provides a method for stably producing 2,3,3,3-tetrafluoropropene for a long period of time wherein unreacted materials are reused after distillation without liquid-liquid separation to suppress catalyst deactivation.Type: ApplicationFiled: June 16, 2015Publication date: August 3, 2017Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Tatsuya TAKAKUWA, Kazuhiro TAKAHASHI, Daisuke KARUBE, Takehiro CHAKI, Masayuki KISHIMOTO, Yuzo KOMATSU
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Patent number: 9708234Abstract: The present invention provides a process for producing a fluoroolefin by reacting, in a gas phase, a fluorinating agent and a chlorine-containing alkene or a chlorine-containing alkane in the presence of at least one catalyst selected from the group consisting of chromium oxide, at least part of which is crystallized, and fluorinated chromium oxide obtained by fluorinating the chromium oxide. According to the present process, a target fluoroolefin can be obtained at a high conversion rate of the starting material and with high selectivity.Type: GrantFiled: July 10, 2013Date of Patent: July 18, 2017Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro Chaki, Daisuke Karube, Masami Nishiumi
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Patent number: 9573868Abstract: The present invention provides a method for purifying chlorinated hydrocarbon(s), comprising cooling a mixture containing hydrogen fluoride and at least one chlorinated hydrocarbon selected from the group consisting of 2-chloro-3,3,3-trifluoropropene, 2,3-dichloro-3,3-difluoropropene, 1,2,3-trichloro-1,1-difluoropropane, and 1,1,1,2,3-pentachloropropane to cause liquid-liquid separation of the mixture into an upper liquid phase having a high hydrogen fluoride concentration and a lower liquid phase having a high chlorinated hydrocarbon concentration, and a method for purifying a chlorinated hydrocarbon, comprising subjecting the lower liquid phase obtained by the liquid-liquid separation to a distillation operation. According to the present invention, a chlorinated hydrocarbon can be purified by separating and removing hydrogen fluoride from a chlorinated hydrocarbon-hydrogen fluoride mixture under simple and economically advantageous conditions.Type: GrantFiled: September 13, 2012Date of Patent: February 21, 2017Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro Chaki, Kazuhiro Takahashi, Hitoshi Yoshimi, Yoshinori Tanaka, Yuusuke Iwanaga
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Publication number: 20160304419Abstract: This invention provides a method for producing 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, in two or three reaction steps, using at least one chlorine-containing compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, and 1,1,2,3-tetrachloropropene as a starting material, the reaction products of at least two of the steps being supplied to the same distillation apparatus to subject the products to a separation operation simultaneously. With this method, 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, can be efficiently produced with reduced energy and equipment costs in an economically advantageous manner.Type: ApplicationFiled: June 23, 2016Publication date: October 20, 2016Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro CHAKI, Kazuhiro TAKAHASHI, Tatsuya TAKAKUWA
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Publication number: 20160304422Abstract: This invention provides a method for producing 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, in two or three reaction steps, using at least one chlorine-containing compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, and 1,1,2,3-tetrachloropropene as a starting material, the reaction products of at least two of the steps being supplied to the same distillation apparatus to subject the products to a separation operation simultaneously. With this method, 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, can be efficiently produced with reduced energy and equipment costs in an economically advantageous manner.Type: ApplicationFiled: June 23, 2016Publication date: October 20, 2016Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro CHAKI, Kazuhiro TAKAHASHI, Tatsuya TAKAKUWA
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Publication number: 20160297730Abstract: This invention provides a method for producing 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, in two or three reaction steps, using at least one chlorine-containing compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, and 1,1,2,3-tetrachloropropene as a starting material, the reaction products of at least two of the steps being supplied to the same distillation apparatus to subject the products to a separation operation simultaneously. With this method, 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, can be efficiently produced with reduced energy and equipment costs in an economically advantageous manner.Type: ApplicationFiled: June 23, 2016Publication date: October 13, 2016Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro CHAKI, Kazuhiro TAKAHASHI, Tatsuya TAKAKUWA
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Patent number: 9452958Abstract: This invention provides a process for producing a fluoroolefin comprising reacting, in a vapor phase, a fluorinating agent and a chlorine-containing alkene or a chlorine-containing alkane in the presence of at least one catalyst selected from the group consisting of chromium oxide containing a Group 5 element and fluorinated chromium oxide containing a Group 5 element. According to the process of the present invention, the target fluoroolefin can be obtained with high starting material conversion and good selectivity.Type: GrantFiled: January 24, 2013Date of Patent: September 27, 2016Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Daisuke Karube, Takehiro Chaki, Masami Nishiumi, Takashi Shibanuma, Masashi Arai
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Patent number: 9428429Abstract: The present invention provides a method for producing a fluorine-containing alkane, which comprises reacting at least one fluorine-containing compound selected from the group consisting of chlorine-containing fluoroalkanes and fluorine-containing alkenes with hydrogen gas in the presence of catalysts, wherein two or more catalysts having different catalytic activities are used, and the fluorine-containing compound and hydrogen gas, which are starting materials, are sequentially brought into contact with the catalysts in the order of the catalyst having a lower catalytic activity followed by the catalyst having a higher catalytic activity. According to the present invention, in the method for producing a fluorine-containing alkane by using chlorine-containing fluoroalkane or fluorine-containing alkene as a starting material, and subjection it to a reduction reaction or a hydrogen addition reaction, the objective fluorine-containing alkane can be produced with high productivity.Type: GrantFiled: February 18, 2011Date of Patent: August 30, 2016Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Yuko Shiotani, Kakeru Hanabusa, Takehiro Chaki, Kazuhiro Takahashi
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Patent number: 9422211Abstract: The present invention provides a process for producing 2,3,3,3-tetrafluoropropene, comprising the steps of producing 2-chloro-3,3,3-trifluoropropene by reacting anhydrous hydrogen fluoride with a specific chlorine-containing compound in a gas phase in the presence of a fluorination catalyst while heating; and producing 2,3,3,3-tetrafluoropropene by reacting 2-chloro-3,3,3-trifluoropropene with anhydrous hydrogen fluoride in a gas phase in the presence of a fluorination catalyst while heating, the step of producing 2-chloro-3,3,3-trifluoropropene being performed after the step of producing 2,3,3,3-tetrafluoropropene. According to the process, 2,3,3,3-tetrafluoropropene can be produced with reduced energy and equipment costs in an economically advantageous manner.Type: GrantFiled: August 7, 2013Date of Patent: August 23, 2016Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Kazuhiro Takahashi, Hitoshi Motoyama, Takehiro Chaki, Daisuke Karube, Masayuki Kishimoto
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Publication number: 20160168059Abstract: The present invention provides a method for producing a fluorine-containing alkane, which comprises reacting at least one fluorine-containing compound selected from the group consisting of chlorine-containing fluoroalkanes and fluorine-containing alkenes with hydrogen gas in the presence of catalysts, wherein two or more catalysts having different catalytic activities are used, and the fluorine-containing compound and hydrogen gas, which are starting materials, are sequentially brought into contact with the catalysts in the order of the catalyst having a lower catalytic activity followed by the catalyst having a higher catalytic activity. According to the present invention, in the method for producing a fluorine-containing alkane by using chlorine-containing fluoroalkane or fluorine-containing alkene as a starting material, and subjection it to a reduction reaction or a hydrogen addition reaction, the objective fluorine-containing alkane can be produced with high productivity.Type: ApplicationFiled: February 23, 2016Publication date: June 16, 2016Inventors: Yuko SHIOTANI, Kakeru HANABUSA, Takehiro CHAKI, Kazuhiro TAKAHASHI
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Publication number: 20160152534Abstract: This invention provides a method for producing 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, in two or three reaction steps, using at least one chlorine-containing compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, and 1,1,2,3-tetrachloropropene as a starting material, the reaction products of at least two of the steps being supplied to the same distillation apparatus to subject the products to a separation operation simultaneously. With this method, 2,3,3,3-tetrafluoropropene or 2-chloro-1,1,1,2-tetrafluoropropane, which is a precursor of 2,3,3,3-tetrafluoropropene, can be efficiently produced with reduced energy and equipment costs in an economically advantageous manner.Type: ApplicationFiled: July 8, 2014Publication date: June 2, 2016Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro Chaki, Kazuhiro Takahashi, Tatsuya Takakuwa
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Publication number: 20150203421Abstract: The present invention provides a process for producing 2,3,3,3-tetrafluoropropene, comprising the steps of producing 2-chloro-3,3,3-trifluoropropene by reacting anhydrous hydrogen fluoride with a specific chlorine-containing compound in a gas phase in the presence of a fluorination catalyst while heating; and producing 2,3,3,3-tetrafluoropropene by reacting 2-chloro-3,3,3-trifluoropropene with anhydrous hydrogen fluoride in a gas phase in the presence of a fluorination catalyst while heating, the step of producing 2-chloro-3,3,3-trifluoropropene being performed after the step of producing 2,3,3,3-tetrafluoropropene. According to the process, 2,3,3,3-tetrafluoropropene can be produced with reduced energy and equipment costs in an economically advantageous manner.Type: ApplicationFiled: August 7, 2013Publication date: July 23, 2015Inventors: Kazuhiro Takahashi, Hitoshi Motoyama, Takehiro Chaki, Daisuke Karube, Masayuki Kishimoto
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Publication number: 20150148571Abstract: The present invention provides a process for producing a fluoroolefin by reacting, in a gas phase, a fluorinating agent and a chlorine-containing alkene or a chlorine-containing alkane in the presence of at least one catalyst selected from the group consisting of chromium oxide, at least part of which is crystallized, and fluorinated chromium oxide obtained by fluorinating the chromium oxide. According to the present process, a target fluoroolefin can be obtained at a high conversion rate of the starting material and with high selectivity.Type: ApplicationFiled: July 10, 2013Publication date: May 28, 2015Inventors: Takehiro Chaki, Daisuke Karube, Masami Nishiumi
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Patent number: 8975456Abstract: The present invention provides a method for purifying HFO-1234yf, comprising the steps of (1) cooling a liquid mixture containing HFO-1234yf and HF to separate the mixture into a upper liquid phase having a high concentration of HF and a lower liquid phase having a high concentration of 2,3,3,3-tetrafluoropropene; and (2) subjecting the lower liquid phase obtained in step (1) to a distillation operation to withdraw a mixture containing HFO-1234yf and HF from a top of a distillation column, thereby obtaining substantially HF-free HFO-1234yf from a bottom of the distillation column. According to the present invention, HF and HFO-1234yf contained in a mixture containing HF and HFO-1234yf can be separated under simple and economically advantageous conditions.Type: GrantFiled: November 9, 2010Date of Patent: March 10, 2015Assignee: Daikin Industries, Ltd.Inventors: Takehiro Chaki, Kazuhiro Takahashi, Yoshinori Tanaka, Hitoshi Yoshimi
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Patent number: 8900417Abstract: This invention provides a method for purifying HFO-1234yf by removing HF from a mixture of HFO-1234yf and HF under simple and economically advantageous conditions.Type: GrantFiled: July 21, 2011Date of Patent: December 2, 2014Assignee: Daikin Industries, Ltd.Inventors: Takehiro Chaki, Kazuhiro Takahashi
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Publication number: 20140303412Abstract: This invention provides a process for producing a fluoroolefin comprising reacting, in a vapor phase, a fluorinating agent and a chlorine-containing alkene or a chlorine-containing alkane in the presence of at least one catalyst selected from the group consisting of chromium oxide containing a Group 5 element and fluorinated chromium oxide containing a Group 5 element. According to the process of the present invention, the target fluoroolefin can be obtained with high starting material conversion and good selectivity.Type: ApplicationFiled: January 24, 2013Publication date: October 9, 2014Inventors: Daisuke Karube, Takehiro Chaki, Masami Nishiumi, Takashi Shibanuma, Masashi Arai
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Publication number: 20140194656Abstract: The present invention provides a method for purifying chlorinated hydrocarbon(s), comprising cooling a mixture containing hydrogen fluoride and at least one chlorinated hydrocarbon selected from the group consisting of 2-chloro-3,3,3-trifluoropropene, 2,3-dichloro-3,3-difluoropropene, 1,2,3-trichloro-1,1-difluoropropane, and 1,1,1,2,3-pentachloropropane to cause liquid-liquid separation of the mixture into an upper liquid phase having a high hydrogen fluoride concentration and a lower liquid phase having a high chlorinated hydrocarbon concentration, and a method for purifying a chlorinated hydrocarbon, comprising subjecting the lower liquid phase obtained by the liquid-liquid separation to a distillation operation. According to the present invention, a chlorinated hydrocarbon can be purified by separating and removing hydrogen fluoride from a chlorinated hydrocarbon-hydrogen fluoride mixture under simple and economically advantageous conditions.Type: ApplicationFiled: September 13, 2012Publication date: July 10, 2014Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro Chaki, Kazuhiro Takahashi, Hitoshi Yoshimi, Yoshinori Tanaka, Yuusuke Iwanaga
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Publication number: 20130105296Abstract: This invention provides a method for purifying HFO-1234yf by removing HF from a mixture of HFO-1234yf and HF under simple and economically advantageous conditions.Type: ApplicationFiled: July 21, 2011Publication date: May 2, 2013Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Takehiro Chaki, Kazuhiro Takahashi