Patent number: 5714655
Abstract: 2,2,3-trichloro-1,1,1,3,3-pentafluoropropane is used as a raw material, to which not less than 4.5 equivalent parts of hydrogen are added to effect a hydrogenation reaction in the presence of a noble metal catalyst, particularly a palladium catalyst, by the vapor phase method to manufacture 1,1,1,3,3-pentafluoropropane. Further, propane, propene, and hexachloropropene, etc. are chlorofluorinated in the presence of a metal catalyst to produce 2,2,3-trichloro-1,1,1,3,3-pentafluoropropane, then this compound is reduced with hydrogen in the presence of a noble metal catalyst to produce 1,1,1,3,3-pentafluoropropane. 2,2,3-trichloro-1,1,1,3,3-pentafluoropropane and 1,1,1,3,3-pentafluoropropane can thus be efficiently and economically produced.
Type:
Grant
Filed:
December 8, 1995
Date of Patent:
February 3, 1998
Assignee:
Daikin Industries, Ltd.
Inventors:
Akinori Yamamoto, Eiji Seki, Hirokazu Aoyama, Seiji Takubo, Tatsuo Nakada
Patent number: 5714654
Abstract: A method is proposed for producing 1,1,1,3,3-pentafluoropropane, in which 1,1,3,3,3-pentafluoropropene is reduced at a temperature between 40.degree. C. and 300.degree. C. by reacting it with hydrogen in a gas phase in the presence of a palladium catalyst. Further, a method is proposed for producing 1,1,1,3,3-pentafluoropropane and/or 1,1,3,3,3-pentafluoropropene, in which the raw material 2-chloro-1,1,3,3,3-pentafluoropropene is hydrogenated especially at a temperature between 30.degree. C. and 450.degree. C. in the presence of a catalyst composed of at least one metal selected from palladium, platinum and rhodium. Further, a method is proposed of producing 1,1,3,3,3-pentafluoropropene, in which 1,1,1,3,3-pentafluoro-2,3-dichloropropane is dechlorinated by using hydrogen in the presence of a metal oxide catalyst. Based on these production methods, 1,1,1,3,3-pentafluoropropane and/or 1,1,3,3,3-pentafluoropropene can thus be produced with high yield rates.
Type:
Grant
Filed:
December 8, 1995
Date of Patent:
February 3, 1998
Assignee:
Daikin Industries Ltd.
Inventors:
Akinori Yamamoto, Eiji Seki, Hirokazu Aoyama, Tatsuo Nakada
Patent number: 5599783
Abstract: A cleaning solvent composition comprising at least one selected from the group consisting of 1H,2H/-hexafluorocyclobutane, 1,2,2,3,3-pentafluoro-cyclobutane, 1,2,2,3,3,4,4,5,5-nonafluorocyclopentane, 1H/2H-octafluorocyclopentane, 1H,2H/-octafluorocyclopentane, 1H/3H-octafluorocyclopentane, 1H,4H,2H/-heptafluorocyclopentane, 1H,2H/4H-heptafluorocyclopentane, 1H,2H,4H/-heptafluorocyclopentane, 1H,3H/2H-heptafluorocyclopentane, 1H,2H/3H-heptafluorocyclopentane and 1H,2H/3H-heptafluorocyclopentane and a method for cleaning or drying acticles employing thereof and use of the composition as a cleaning agent.
Type:
Grant
Filed:
May 9, 1995
Date of Patent:
February 4, 1997
Assignee:
Daikin Industries, Ltd.
Inventors:
Satoshi Ide, Takahiro Matsuda, Hirokazu Aoyama, Akinori Yamamoto