| abstract |
The invention relates to a method for purifying a cruden1,1,1,3,3-pentafluoropropane (HFC-245fa) containing HFC-245fanand 1-chloro-3,3,3-trifluoro-trans-1-propene (HCFC-1233zd(t)),nby distillation. This method is characterized innthat the distillation is conducted in the presence of a solventnhaving a boiling point which is higher than that of HCFC-1233zd(t),nthereby to substantially remove HCFC-1233zd(t)nfrom the crude HFC-245fa. This solvent may be selected fromnthe group consisting of carbon chlorides, chlorohydrocarbons,nfluorochlorohydrocarbons, saturated hydrocarbons, andnmixtures thereof. With the use of this solvent, it becomesnpossible to substantially easily separate HFC-245fa fromnHCFC-1233zd(t). |