Process for the manufacture of 2-chloro-3,3,3-trifluoropropene by gas phase fluorination of pentachloropropane
View Patent ↗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 comprising introducing reactants comprising 1,1,1,2,3-pentachloropropane and/or 1,1,2,2,3-pentachloropropane, HF, and oxygen in the gas phase into a reaction zone containing a catalyst to yield 2-chloro-3,3,3-trifluoropropene, wherein oxygen is introduced in an amount from 0.5 to 10 mole % of oxygen per pentachloropropane molecule, wherein no stabilizer is introduced to the reactor, and wherein conversion is 100% for at least 86 hours.
2. The process according to claim 1 wherein said catalyst comprises Ni—Cr, preferably supported.
3. The process according to claim 1 , wherein said catalyst is supported on a support selected from fluorinated alumina, fluorinated chromia, fluorinated activated carbon or graphite carbon.
4. The process according to claim 1 , wherein said catalyst further comprises a co-catalyst selected from Ni, Co, Zn, Mn or mixtures thereof; and wherein said co-catalyst is present in an amount from about 1-10 wt % of said catalyst.
5. The process according to claim 1 , wherein said catalyst is activated with a fluorine-containing compound.
6. The process according to claim 1 , in which said 1,1,1,2,3-pentachloropropane contains up to 40 mol % of 1,1,2,2,3-pentachloropropane.
7. The process according to claim 1 , carried out at a pressure from 1 to 20 bars.
8. The process according to claim 1 , carried out at a temperature of from 200 to 450° C.
9. The process according to claim 1 , carried out with a contact time from 6 to 100 sec.
10. The process according to claim 1 , carried out at a molar ratio of HF to 1,1,1,2,3-pentachloropropane and/or 1,1,2,2,3-pentachloropropane of from 3:1 to 150:1.
11. The process according to claim 1 which is continuous.
12. The process according to claim 5 , wherein said fluorine-containing compound is hydrogen fluoride.
13. The process according to claim 5 , wherein said catalyst is activated at a pressure above 10 bars.
14. The process according to claim 1 , carried out at a pressure from 3 to 15 bars.
15. The process according to claim 1 , carried out at a pressure from 5 to 10 bars.
16. The process according to claim 1 , carried out at a temperature of from 300 to 430° C.
17. The process according to claim 1 , carried out at a temperature of from 320 to 420° C.
18. The process according to claim 1 , carried out with a contact time from 10 to 80 sec.
19. The process according to claim 1 , carried out with a contact time from 15 to 50 sec.
20. The process according to claim 1 , carried out at a molar ratio of HF to 1,1,1,2,3-pentachloropropane and/or 1,1,2,2,3-pentachloropropane of from 4:1 to 70:1.
21. The process according to claim 1 , carried out at a molar ratio of HF to 1,1,1,2,3-pentachloropropane and/or 1,1,2,2,3-pentachloropropane of from 5:1 to 50:1.