Method of producing 1,1,1,2,2-pentafluoroethane, a method of pro

Details Method of producing 1,1,1,2,2-pentafluoroethane, a method of pro Method of producing 1,1,1,2,2-pentafluoroethane, a method of pro

1998-02-13

1998-12-08

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570166, 570167, 570168, 570176, 570177, C07C 1708, C07C 1908, C07C 1738

Patent

active

058472444

ABSTRACT:
A production method in which reaction processes are divided into two regions comprising one reaction region where mainly perohloroethylene is made to react with HF in a vapor phase in the presence of a catalyst and the other reaction region where HCFC-123 (CF.sub.3 CHCl.sub.2) and/or HCFC-124 (CF.sub.3 CFHCl) is made to react with HF in a vapor phase in the presence of a catalyst, the former region being kept at a higher pressure and the latter region at a lower pressure during the reaction procedure. By this method it is possible to keep the conversion of perchloroethylene at a high level while securing the life of a catalyst, and it is also possible to raise the selectivity of HFC-125. This is a method of producing HFC-125 in which the content of CFC-115 is lowered to not more than 15 vol % of the total amount of HFC-125 and CFC-115, and then CFC-115 is made to react with hydrogen in the presence of a catalyst. By this method, reaction conditions can be lightened and the absolute amount of by-products also decreased, and the effective purification of HFC-125 can be realized.

REFERENCES:
patent: 4967023 (1990-10-01), Carmell et al.
patent: 5300710 (1994-04-01), Corbin et al.
patent: 5679876 (1997-10-01), Hub et al.

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