Patents by Inventor Tatsuo Nakada
Tatsuo Nakada 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: 7183448Abstract: A mixture comprising at least 1,1,1,3,3-pentafluoropropane and 1,1,1-trifluoro-3-chloro-2-propene is subjected to a distillation operation, and thereby, a distillate comprising an azeotropic composition consisting substantially of 1,1,1,3,3-pentafluoropropane and 1,1,1-trifluoro-3-chloro-2-propene is obtained and a bottom product comprising 1,1,1,3,3-pentafluoropropane or 1,1,1-trifluoro-3-chloro-2-propene which each is separated and purified.Type: GrantFiled: November 10, 1999Date of Patent: February 27, 2007Assignee: Daikin Industries, Ltd.Inventors: Tatsuo Nakada, Masayoshi Imoto, Takashi Shibanuma
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Patent number: 7094934Abstract: In a process for producing a hydrogen-containing fluorinated hydrocarbon in which a halogenated hydrocarbon reaction raw material, which includes a chlorinated alkene and/or a hydrogen-containing chlorinated alkane, is subjected to a fluorination reaction with hydrogen fluoride in a liquid phase in a reactor in the presence of a fluorination catalyst to obtain a reaction mixture which includes the hydrogen-containing fluorinated hydrocarbon, the reactor to be used has a portion which is able to contact with the reaction mixture, at least a part of this portion being made of an alloy material of 18 to 20% by weight of chromium, 18 to 20% by weight of molybdenum, 1.5 to 2.2% by weight of at least one element selected from niobium and tantalum and the balance of nickel.Type: GrantFiled: January 31, 2001Date of Patent: August 22, 2006Assignee: Daikin Industries, Ltd.Inventors: Noriaki Shibata, Tatsuo Nakada, Takashi Shibanuma
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Publication number: 20050085674Abstract: A mixture comprising at least 1,1,1,3,3-pentafluoropropane and 1,1,1-trifluoro-3-chloro-2-propene is subjected to a distillation operation, and thereby, a distillate comprising an azeotropic composition consisting substantially of 1,1,1,3,3-pentafluoropropane and 1,1,1-trifluoro-3-chloro-2-propene is obtained and a bottom product comprising 1,1,1,3,3-pentafluoropropane or 1,1,1-trifluoro-3-chloro-2-propene which each is separated and purified.Type: ApplicationFiled: November 10, 1999Publication date: April 21, 2005Inventors: Tatsuo Nakada, Masayoshi Imoto, Takashi Shibanuma
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Patent number: 6863780Abstract: There is provided an azeotropic mixture having 1,1,1,3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture of R-245fa and HF wherein the mixture of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride is subjected to a distillation step so that a distillate is obtained which has the azeotropic mixture of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride, and a bottom product is obtained which has separated/purified 1,1,1,3,3-pentafluoropropane or hydrogen fluoride.Type: GrantFiled: September 28, 2001Date of Patent: March 8, 2005Inventors: Tatsuo Nakada, Noriaki Shibata, Takashi Shibanuma
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Patent number: 6846963Abstract: In a process for producing 1,1,1,3,3-pentafluoropropane which has a liquid-phase reaction step for fluorination of 1,1,1,3,3-pentahalopropane (wherein at least one of halogen atoms is not fluorine) with HF in the presence of antimony pentahalide catalyst in a reactor to obtain a reaction mixture comprising 1,1,1,3,3-pentafluoropropane and the antimony pentahalide catalyst, the fluorination is conducted at a reaction temperature less than 50° C.Type: GrantFiled: February 11, 2004Date of Patent: January 25, 2005Assignee: Daikin Industries, Ltd.Inventors: Tatsuo Nakada, Seiji Takubo, Toshikazu Yoshimura, Takashi Shibanuma
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Publication number: 20040162451Abstract: In a process for producing 1,1,1,3,3-pentafluoropropane which has a liquid-phase reaction step for fluorination of 1,1,1,3,3-pentahalopropane (wherein at least one of halogen atoms is not fluorine) with HF in the presence of antimony pentahalide catalyst in a reactor to obtain a reaction mixture comprising 1,1,1,3,3-pentafluoropropane and the antimony pentahalide catalyst, the fluorination is conducted at a reaction temperature less than 50° C.Type: ApplicationFiled: February 11, 2004Publication date: August 19, 2004Applicant: Daikin Industries, Ltd.Inventors: Tatsuo Nakada, Seiji Takubo, Toshikazu Yoshimura, Takashi Shibanuma
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Publication number: 20030060669Abstract: In a process for producing a hydrogen-containing fluorinated hydrocarbon in which a halogenated hydrocarbon reaction raw material, which includes a chlorinated alkene and/or a hydrogen-containing chlorinated alkane, is subjected to a fluorination reaction with hydrogen fluoride in a liquid phase in a reactor in the presence of a fluorination catalyst to obtain a reaction mixture which includes the hydrogen-containing fluorinated hydrocarbon, the reactor to be used has a portion which is able to contact with the reaction mixture, at least a part of this portion being made of an alloy material of 18 to 20% by weight of chromium, 18 to 20% by weight of molybdenum, 1.5 to 2.2% by weight of at least one element selected from niobium and tantalum and the balance of nickel.Type: ApplicationFiled: August 2, 2002Publication date: March 27, 2003Inventors: Noriaki Shibata, Tatsuo Nakada, Takashi Shibanuma
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Patent number: 6521802Abstract: The present invention provides a process for preparing a fluorine-containing halogenated hydrocarbon compound by fluorinating, in a reaction field where an antimony halide compound represented by the general formula: SbClpF5−p (I) wherein p is a value within a range from 0 to 2, and hydrogen fluoride and a halogenated hydrocarbon compound as a raw material exist, the halogenated hydrocarbon compound in a molar ratio of the antimony halide compound to hydrogen fluoride within a range from 40/60 to 90/10. According to this process, a fluorine-containing halogenated hydrocarbon compound (HFC), which is important as a substitute compound of CFC or HCFC, can be prepared economically advantageously with good selectivity while suppressing a corrosive action of a reaction vessel.Type: GrantFiled: May 29, 2002Date of Patent: February 18, 2003Assignee: Daikin Industries, Ltd.Inventors: Seiji Takubo, Noriaki Shibata, Tatsuo Nakada, Takashi Shibanuma
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Patent number: 6472573Abstract: A method of preparation for 1,1,1,3,3-pentafluoropropane (HFC-245fa) wherein the first process gives mainly 1,3,3,3-tetrafluoropropene (1234ze) by reacting 1-chloro-3, 3,3,-trifluoropropene (1233zd) with hydrogen fluoride in the gas phase and subsequently the second process gives 1,1,1,3,3-pentafluoropropane (HFC-245fa) by reacting 1,3,3,3-tetrafluoropropene (1234ze), separated as a component that does not contain hydrogen chloride from crude products obtained by the first process, with hydrogen fluoride in the gas phase. To provide a process that is capable of preparing economically HFC-245fa which does not require the separation of HFC-245fa and 1233zd.Type: GrantFiled: August 2, 2000Date of Patent: October 29, 2002Assignee: Daikin Industries, Ltd.Inventors: Akinori Yamamoto, Noriaki Shibata, Tatsuo Nakada, Takashi Shibanuma
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Patent number: 6403847Abstract: One or more materials selected from 1,1,1,3,3-pentachloropropane, 1,1,3,3-tetrachloropropene and 1,3,3,3-tetrachloropropene are used as the specific materials described above. Before submitting the materials and HF to a fluorination reaction, almost all water is removed from them. To continuously manufacture useful intended products efficiently as well as to prevent deactivation of the catalyst and the accumulation of organic substances with high boiling points when manufacturing said useful 1,1,1,3,3-pentafluoropropane and/or 1-chloro-3,3,3-trifluoropropene, by fluorinating the specific materials with HF in the presence of a catalyst.Type: GrantFiled: March 20, 2001Date of Patent: June 11, 2002Assignee: Daikin Industries Ltd.Inventors: Tatsuo Nakada, Takashi Shibanuma, Noriaki Shibata
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Publication number: 20020068686Abstract: There is provided an azeotropic mixture consisting substantially of 1, 1, 1 3, 3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture comprising R-245fa and HF wherein the mixture comprising 1, 1, 1, 3, 3-pentafluoropropane and hydrogen fluoride is subjected to a distillation step so that a distillate is obtained which comprises the azeotropic mixture consisting substantially of 1, 1, 1, 3, 3-pentafluoropropane and hydrogen fluoride, and a bottom product is obtained which comprises separated/purified 1, 1, 1, 3, 3-pentafluoropropane or hydrogen fluoride.Type: ApplicationFiled: September 28, 2001Publication date: June 6, 2002Applicant: Daikin Industries Ltd.Inventors: Tatsuo Nakada, Noriaki Shibata, Takashi Shibanuma
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Patent number: 6328907Abstract: There is provided an azeotropic mixture consisting substantially of 1,1,1, 3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture comprising R-245fa and HF wherein the mixture comprising 1,1,1,3,3-pentafluoropropane and hydrogen fluoride is subjected to a distillation step so that a distillate is obtained which comprises the azeotropic mixture consisting substantially of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride, and a bottom product is obtained which comprises separated/purified 1,1,1,3,3-pentafluoropropane or hydrogen fluoride.Type: GrantFiled: July 23, 1998Date of Patent: December 11, 2001Assignee: Daikin Industries, Ltd.Inventors: Tatsuo Nakada, Noriaki Shibata, Takashi Shibanuma
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Patent number: 6329560Abstract: A method for producing a hydrogen-containing fluorinated hydrocarbon includes supplying HF to a gap between an inner reactor made of a material resistant to the reaction and an outer container made of a material resistant to HF; supplying HF to the inner reactor; supplying a halogenated hydrocarbon selected from a chlorinated alkene and a hydrogen-containing chlorinated alkane to the inner reactor; and reacting HF with halogenated hydrocarbon in the presence of a fluorination catalyst in the inner reactor to obtain the reaction product containing the hydrogen-containing fluorinated hydrocarbon.Type: GrantFiled: January 12, 2001Date of Patent: December 11, 2001Assignee: Daikin Industries, Ltd.Inventors: Tatsuo Nakada, Noriaki Shibata, Takashi Shibanuma
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Patent number: 6316682Abstract: A method of producing 1,1,1,3,3-pentafluoropropane wherein 1,1,1,3,3-pentafluoropropane is obtained by reacting at least one selected from the group consisting of fluorinated and chlorinated propane and chlorinated propane expressed by a general formula of CX3CH2CHX2 (where X in this general formula indicates either a fluorine atom or a chlorine atom, but all of X's can never represent fluorine atoms at the same time) with a fluorinated antimony chloride. There is provided an economical and efficient method of producing 1,1,1,3,3-pentafluoropropane with high yield, which is an alternative compound to CFC's and HCFC's and is important in industry as a blowing agent, a refrigerant, a detergent, and a propellant that does not destroy the ozone in the ozone layer.Type: GrantFiled: November 30, 1998Date of Patent: November 13, 2001Assignee: Daikin Industries, Ltd.Inventors: Tatsuo Nakada, Takashi Shibanuma, Yamamoto Akinori
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Patent number: 6291728Abstract: A manufacturing method for 1,1,1,3,3-pentafluoropropane, wherein 1,1,1,3,3-pentafluoropropane (HFC-245fa) is obtained by reacting halogenated propane, for example, 1,1,1,3,3-pentachloropropane and so on, which is represented by the general formula: CX3CH2CHX2 [In the general formula, X is fluorine atom (F) or chlorine atom (Cl), and all of X can not be fluorine atoms at the same time], with anhydrous hydrofluoric acid (HF) under the presence of antimony catalyst. HFC-245fa can be obtained with high yield and economical advantages through simple process.Type: GrantFiled: March 27, 1998Date of Patent: September 18, 2001Assignee: Daikin Industries, Ltd.Inventors: Hirokazu Aoyama, Tatsuo Nakada, Akinori Yamamoto
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Publication number: 20010021792Abstract: A method for producing a hydrogen-containing fluorinated hydrocarbon includes supplying HF to a gap between an inner reactor made of a material resistant to the reaction and an outer container made of a material resistant to HF; supplying HF to the inner reactor; supplying a halogenated hydrocarbon selected from a chlorinated alkene and a hydrogen-containing chlorinated alkane to the inner reactor; and reacting HF with halogenated hydrocarbon in the presence of a fluorination catalyst in the inner reactor to obtain the reaction product containing the hydrogen-containing fluorinated hydrocarbon.Type: ApplicationFiled: January 12, 2001Publication date: September 13, 2001Inventors: Tatsuo Nakada, Noriaki Shibata, Takashi Shibanuma
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Patent number: 6191328Abstract: HFC-245fa is effectively separated from the mixture comprising 1,1,1,3,3-pentafluoropropane (HFC-245fa) and HF through a purification process comprising contacting at least one extraction agent selected from the group consisting of (a) a compound corresponds to the general formula (I): CxFyHz, (b) a compound corresponds to the general formula (II): R1R2R3N, (c) an compound corresponds to the general formula (III): R4OR5 and (d) a compound corresponds to the general formula (IV): ClClmHn with a mixture comprising 1,1,1,3,3-pentafluoropropane and hydrogen fluoride so as to form a liquid mixture and separating the liquid mixture into two liquid layers, followed by obtaining an extraction agent phase including HFC-245fa and the extraction agent as the main components, and separatively recovering HFC-245fa from the extraction agent phase.Type: GrantFiled: December 22, 1998Date of Patent: February 20, 2001Assignee: Daikin Industries, Ltd.Inventors: Keisuke Kitano, Tatsuo Nakada, Takashi Shibanuma
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Patent number: 6018084Abstract: A manufacturing method for 1,1,1,3,3-pentafluoropropane comprises a first process, in which 1,1,1-trifluoro-3-chloro-2-propene is obtained by inducing a reaction between 1,1,1,3,3-pentafluoropropane and hydrogen fluoride in the vapor phase, and a second process, in which the 1,1,1,3,3-pentafluoropropane is obtained by inducing a reaction between 1,1,1-trifluoro-3-chloro-2-propene and hydrogen in the vapor phase, and 1,1,1-trifluoro-3-chloro-2-propene obtained in the first process is supplied to the second process after removing the HCl by-products. This invention can provide a new economic manufacturing method of 1,1,1,3,3-pentafluoropropane with high yield and selectivity.Type: GrantFiled: June 25, 1998Date of Patent: January 25, 2000Assignee: Daikin Industries Ltd.Inventors: Tatsuo Nakada, Hirokazu Aoyama, Akinori Yamamoto
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Patent number: 5919993Abstract: At least one halogenated compound selected from the group consisting of 1,1,1,4,4,4-hexafluoro-2,3-dichlorobutane, 1,1,1,4,4,4-hexafluoro-2-chloro-2-butene, 1,1,1,2,4,4,4-heptafluoro-2-butene and 1,1,1,2,2,4,4,4-octafluorobutane, is prepared by reacting 1,1,2,3,4,4-hexachloro-1,3-butadiene with hydrogen fluoride in a gas phase in the presence of a fluorinating catalyst. Desired products can be prepared commercially according to the present invention.Type: GrantFiled: September 3, 1993Date of Patent: July 6, 1999Assignee: Daikin Industries Ltd.Inventors: Tatsuo Nakada, Hirokazu Aoyama, Satoshi Koyama
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Patent number: 5789632Abstract: A mixture containing hydrogen fluoride and 1,1,1,3,3-pentafluoro-2,3-dichloropropane is subjected to distillation to form an azeotropic composition of 85 to 95 mol % of hydrogen fluoride and 15 to 5 mol % of 1,1,1,3,3-pentafluoro-2,3-dichloropropane, and the azeotropic composition is liquid-separated to form a lower liquid phase. Then, an azeotropic composition is withdrawn from the lower liquid phase by distillation, whereby 1,1,1,3,3-pentafluoro-2,3-dichloropropane is obtained.Without formation of an aqueous solution of diluted hydrofluoric acid, 1,1,1,3,3-pentafluoro-2,3-dichloropropane is obtained which is substantially free of hydrogen fluoride.Type: GrantFiled: June 20, 1996Date of Patent: August 4, 1998Assignee: Daikin Industries, Ltd.Inventors: Tatsuo Nakada, Hirokazu Aoyama