Patent ID: 8420872

Claim:
A process for preparing a fluorine-containing propene represented by the chemical formula CF 3 CF═CX 1 X 2 , wherein X 1 is a hydrogen atom or a chlorine atom, and X 2 is a fluorine atom, a chlorine atom, or a hydrogen atom; the process comprising the step of reacting at least one halogenated propene selected from the group consisting of CF 2 ClCF═CCl 2 , CFCl 2 CF═CCl 2 and a compound represented by the chemical formula CClYZCF=CH 2 , wherein Y and Z may be the same or different and individually represent a fluorine atom or a chlorine atom, with anhydrous hydrogen fluoride in a gas phase in the presence of a chromium oxide or a fluorinated chromium oxide as a fluorination catalyst, wherein the fluorine-containing propene obtained by the process is CF 3 CF═CCl 2 when CF 2 ClCF═CCl 2 or CFCl 2 CF═CCl 2 is the halogenated propene, and the fluorine-containing propene obtained by the process is CF 2 ClCF═CH 2 when the compound represented by the chemical formula CClYZCF═CH 2 is the halogenated propene.