PROCESS TO MANUFACTURE 2-CHLORO-1,1,1,2-TETRAFLUOROPROPANE (HCFC-244bb)

摘要

The invention relates to a process to produce HCFC-244bb from HCFO-1233xf wherein, in one embodiment, co-feed species HFC-245cb is added to the reaction at a pressure of at least about 100 psig; and in another embodiment it is added to maintain a mole ratio of HFC-245cb to HCFO-1233xf of between about 0.005:1 to about 1:1. The HFC-245cb may be added as recycled by-product of the reaction and/or added as fresh feed. The HFC-245cb provides elevated pressures to the reaction thereby facilitating reactor operation, mixing and HCFC-244bb product removal. Other co-feed species are also disclosed.

主权项

1. A process to prepare 2-chloro-1,1,1,2-tetrafluoropropane (244bb) comprising:
(a) contacting 2-chloro-3,3,3,-trifluoropropene (1233xf) with HF in a reaction zone under conditions effective to form 244bb; and (b) adding a co-feed species selected from the group consisting of CFC-12 (dichlorodifluoromethane), CFC-13 (chlorotrifluoromethane), CFC-14 (tetrafluoromethane), HCFC-22 (chlorodifluoromethane), HCFC-23 (trifluoromethane), HFC-32 (difluoromethane), HCC-40 (chloromethane) HFC-41 (fluoromethane), CFC-115 (chloropentafluoroethane), FC-116 (hexafluoroethane), HCFC-124 (2-chloro-1,1,1,2-tetrafluoroethane), HFC-125 (pentafluoroethane), HFC-134a (1,1,1,2-tetrafluoroethane), HFC-143a (1,1,1-trifluoroethane), HFC-152a (1,1-difluoroethane), HFC-161 (fluoroethane), FC-218 (octafluoropropane), HFC-227ea (1,1,1,2,3,3,3-heptafluoroethane), SF6 (sulfur hexafluoride), and 1,1,1,2,2-pentafluoropropane (245cb) to the reaction zone to maintain a mole ratio of co-feed species to 1233xf of between about 0.005:1 to about 1:1.