Integrated process to produce 2,3,3,3-tetrafluoropropene

Details Integrated process to produce 2,3,3,3-tetrafluoropropene Integrated process to produce 2,3,3,3-tetrafluoropropene

2009-03-13

2011-11-15

Katakam, Sudhakar (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C570S135000, C570S167000, C570S164000, C570S179000, C570S188000

Reexamination Certificate

active

08058486

ABSTRACT:
A method for preparing 2,3,3,3-tetrafluoroprop-1-ene comprising (a) providing a starting composition comprising at least one compound having a structure selected from Formulae I, II and III:in-line-formulae description="In-line Formulae" end="lead"?CX2═CCl—CH2X  (Formula I)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?CX3—CCl═CH2  (Formula II)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?CX3—CHCl—CH2X  (Formula III)in-line-formulae description="In-line Formulae" end="tail"?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.

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