Process of separating/purifying pentafluoropropane
Process of separating/purifying pentafluoropropane
US Patènt # 6863780
| Invèntors: | Nakada; Tatsuo (c/o Yodogawa Works of Daikin Industries, Ltd., 1-1, Nishihitotsuya, Settsu-shi, Osaka 566, JP); Shibata; Noriaki (c/o Yodogawa Works of Daikin Industries Ltd., 1-1, Nishihitotsuya, Settsu-shi, Osaka 566, JP); Shibanuma; Takashi (c/o Yodogawa Works of Daikin Industries Ltd., 1-1, Nishihitotsuya, Settsu-shi, Osaka 566, JP) |
| Appl. No.: | 964364 |
| Filed: | September 28, 2001 |
ABSTRACT
There is provided an azeotropic mixture having 1,1,1,3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture of R-245fa and HF wherein the mixture of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride is subjected to a distillation step so that a distillate is obtained which has the azeotropic mixture of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride, and a bottom product is obtained which has separated/purified 1,1,1,3,3-pentafluoropropane or hydrogen fluoride.
