Process for producing 1,1,1,3,3-pentafluoropropane
AssigneeDaikin Industries, Ltd.
InventorsAkinori Yamamoto, Noriaki Shibata, Tatsuo Nakada, Takashi Shibanuma
Life of this patent
Estimating the term…
Abstract
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.
Claims6
A preparation method for 1,1,1,3,3-pentafluoropropane comprising:
- a first process which gives a reaction mixture consisting mainly of 1,3,3,3-tetrafluoropropene by reacting 1-chloro-3,3,3-trifluoropropene with hydrogen fluoride in a gas phase;
- a subsequent process of removing HCl and 1-chloro-3,3,3-trifluoropropene substantially completely from the said reaction mixture without removing hydrogen fluoride;
- and
- a further subsequent process which gives 1,1,1,3,3-pentafluoropropane by reacting 1,3,3,3-tetrafluoropropene which is obtained by reacting 1,3,3,3-tetrafluoropropene, in an azeotropic mixture with hydrogen fluoride that does not contain HCl and 1-chloro-3,3,3-trifluoropropene, with hydrogen fluoride in a gas phase.
Dependencies are inferred from the claim text.