Method for purifying crude 1,1,1,3,3-pentafluoropropane

Details Method for purifying crude 1,1,1,3,3-pentafluoropropane Method for purifying crude 1,1,1,3,3-pentafluoropropane

1998-03-10

2000-09-19

Manoharan, Virgina

Distillation: processes, separatory

Adding material to distilland except water or steam per se

At least two materials

203 52, 203 57, 203 67, 203 68, 203 69, 203 70, 570178, B01D 340, C07C 17386

Patent

active

061206520

ABSTRACT:
The invention relates to a method for purifying a crude 1,1,1,3,3-pentafluoropropane (HFC-245fa) containing HFC-245fa and 1-chloro-3,3,3-trifluoro-trans-1-propene (HCFC-1233zd(t)), by distillation. This method is characterized in that the distillation is conducted in the presence of a solvent having a boiling point which is higher than that of HCFC-1233zd(t), thereby to substantially remove HCFC-1233zd(t) from the crude HFC-245fa. This solvent may be selected from carbon chlorides, chlorohydrocarbons, fluorochlorohydrocarbons, saturated hydrocarbons, and mixtures thereof. With the use of this solvent, it becomes possible to substantially easily separate HFC-245fa from HCFC-1233zd(t).

REFERENCES:
patent: 5087329 (1992-02-01), Felix
patent: 5574192 (1996-11-01), VanDerPuy et al.
patent: 5672294 (1997-09-01), Lund et al.
patent: 5710352 (1998-01-01), Tung
patent: 5788886 (1998-08-01), Minor et al.
patent: 5811603 (1998-09-01), Elsheikh
patent: 6039845 (2000-03-01), Bertocchio et al.

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