C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 17/386 (2006.01) C07C 19/08 (2006.01)
Patent
CA 2197171
There is provided a process of effectively separating pentafluoroethane (HFC-125) out of a mixture of HFC and chloropentafluoroethane (CFC-115). When the mixture of HFC-125 and CFC-115 is subjected to extractive distillation so as to obtain concentrated HFC-125, methanol, ethanol, butanol, propyl alcohol, pentafluoropropanol, tetrafluoropropanol or acetone is used as an extractant, whereby CFC- 115 is obtained as a distillate product and a mixture of HFC-125 and the extractant as a bottom product is obtained. Then, the extractant is separated from HFC-125 by distilling the mixture and re-used in the extractive distillation.
L'invention concerne un procédé pour séparer efficacement le pentafluoroéthane (HFC-125) lorsqu'il est en mélange avec du chloropentafluoroéthane (CFC-115). Le procédé pour obtenir le HFC-125 hautement concentré consiste à effectuer une distillation extractive d'un mélange de HFC-125 et de CFC-115 en utilisant du méthanol, de l'éthanol, du butanol, de l'alcool propylique, du pentafluoropropanol, du tétrafluoropropanol ou de l'acétone comme solvant d'extraction pour obtenir le CFC-115 en tant que distillat et un mélange de HFC-125 avec le solvant d'extraction en tant qu'huile. Ensuite, on distille le mélange pour séparer le HFC-125 du solvant d'extraction et on réutilise ce dernier dans la distillation extractive.
Kohno Satoru
Shibanuma Takashi
Daikin Industries Ltd.
Kirby Eades Gale Baker
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