| 摘要 |
PURPOSE: An integrated process for preparing 2,3,3,3-tetrafluoroprop-1-ene is provided to ensure the ability to recycle unreacted starting materials to maximize raw material utilization and product yields and the ability to isolate by-products that are commercially valuable. CONSTITUTION: A method for preparing 2,3,3,3-tetrafluoroprop-1-ene comprises: (a) providing a starting composition comprising at least one compound having a structure selected from Formulae I, II and III: CX 2 =CCl-CH 2 X (Formula I), CX 3 -CCl=CH 2 (Formula II), and CX 3 -CHCl-CH 2 X (Formula III) wherein X is independently selected from F, Cl, Br, and I, provided that at least one X is not fluorine; (b) contacting said starting composition with a first fluorinating agent to produce a first intermediate composition comprising 2-chloro-3,3,3-trifluoropropene and a first chlorine-containing byproduct; (c) contacting said first intermediate composition with a second fluorinating agent to produce a second intermediate composition comprising 2-chloro-1,1,1,2-tetrafluoropropane and a second chlorine-containing byproduct; and (d) catalytically dehydrochlorinating at least a portion of said 2-chloro-1,1,1,2-tetrafluoropropane to produce a reaction product comprising 2,3,3,3-tetrafluoroprop-1-ene. |
