Gas-phase catalytic fluorination with chromium catalysts

A process for the fluorination of a chlorinated C3 alkane or alkene compound having at least one chlorine atom into a fluorinated C3 alkane or alkene compound having at least one fluorine atom comprising:

• (a) contacting, in a reactor, the chlorinated compound with hydrogen fluoride in gas phase in the presence of a fluorination catalyst to produce a fluorinated compound,
• (b) regenerating the fluorination catalyst used in step a), wherein regenerating the fluorination catalyst comprises:
• (c) treating said fluorination catalyst with an oxidizing agent-containing gas flow to form an oxidized fluorination catalyst, and
• (d) treating the oxidized fluorination catalyst obtained in step (c) with a gaseous mixture comprising a reducing agent, an inert gas and HF, wherein the reducing agent is selected from the group consisting of hydrogen, carbon monoxide, nitrogen monoxide, formaldehyde, C1-C6 alkanes and C1-C10 hydrohalocarbons;
• and
• (e) reusing the catalyst regenerated in step b) in step a).