Preparation of 1,1,1,3,3-pentafluoropropane
AssigneeElf Atochem North America, Inc.
InventorsMaher Y. Elsheikh, Michael S. Bolmer, Bin Chen
Life of this patent
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Abstract
A process for the preparation of 245fa is provided, wherein 1233zd is first fluorinated to 1234ze, followed by fluorination of 1234ze to 245fa. 245fa is a known foam blowing agent and refrigerant.
Claims5
A process for preparing 1,1,1,3,3-pentafluoropropane which comprises (a) contacting 1,1,1 -trifluoro-3-chloro-2-propene with hydrogen fluoride in a first reaction zone under conditions sufficient to produce a reaction mixture containing 1,1,1,3-tetrafluoro-2-propene;
- and (b) seperating the 1,1,1,3-tetrafluoro-2-propene from said reaction mixture and contacting it with hydrogen fluoride in a second reaction zone under conditions sufficient to produce 1,1,1,3,3-pentafluoropropane.
A process for preparing 1,1,1,3,3-pentafluoropropane which comprises (a) contacting 1,1, 1-trifluoro-3-chloro-2-propene with hydrogen fluoride in a first reaction zone under conditions sufficient to produce a reaction mixture containing 1,1,1,3-tetrafluoro-2-propene, 1,1,1,3,3-pentafluoropropane, and hydrogen chloride, together with unreacted 1,1,1-trifluoro-3-chloro-2-propene and hydrogen fluoride;
- and (b) separating the 1,1,1,3-tetrafluoro-2-propene from said reaction mixture and contacting it with hydrogen fluoride in a second reaction zone under conditions sufficient to produce 1,1,1,3,3-pentafluoropropane.
Dependencies are inferred from the claim text.