Process for the manufacture of 2-chloro-3,3,3-trifluoropropene by gas phase fluorination of pentachloropropane
The present invention provides a process of catalytic fluorination in gas phase of product 1,1,1,2,3-pentachloropropane or/and 1,1,2,2,3-pentachloropropane into product 2-chloro-3,3,3-trifluoropropene in presence of a catalyst and oxygen.
1. A catalytic fluorination process for producing 2-chloro-3,3,3-trifluoropropene comprising:
activating a fluorination catalyst with a fluorine-containing compound, wherein the fluorination catalyst is a chromium catalyst further comprising a zinc co-catalyst, said zinc co-catalyst being present in an amount from about 1-10 wt % of said fluorination catalyst, and
reacting 1,1,1,2,3-pentachloropropane and/or 1,1,2,2,3-pentachloropropane in a gas phase in the presence of HF, oxygen, and the activated fluorination catalyst and the absence of a polymerization stabilizer, wherein the fluorination reaction takes place at a reaction pressure and activating the fluorination catalyst takes place at a pressure above the reaction pressure.
2. The process according to claim 1 , wherein the ratio of oxygen with respect to 1,1,1,2,3-pentachloropropane and/or 1,1,2,2,3-pentachloropropane is 0.05 to 15 mole %.
3. The process according to claim 1 , wherein said catalyst is supported on a support selected from the group consisting of fluorinated alumina, fluorinated chromia, fluorinated activated carbon and graphite carbon.
4. The process according to claim 1 , wherein the 1,1,1,2,3-pentachloropropane contains up to 40 mol % of isomer 1,1,2,2,3-pentachloropropane.
5. The process according to claim 1 , wherein the process is carried out at a temperature of from 200 to 450° C.
6. The process according to claim 1 , wherein the process is carried out with a contact time from 6 to 100 sec.
7. The process according to claim 1 , wherein the process is carried out with a molar ratio HF:240 from 3:1 to 150:1.
8. The process according to claim 1 wherein the process is continuous.