Process for purifying 1,1,1,2-tetrafluoroethane

Details Process for purifying 1,1,1,2-tetrafluoroethane Process for purifying 1,1,1,2-tetrafluoroethane

1994-03-23

1995-01-17

Siegel, Alan

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

Organic compounds

Halogen containing

570177, C07C 1738, C07C 1908

Patent

active

053827244

ABSTRACT:
A process for purifying 1,1,1,2-tetrafluoroethane which comprises allowing an HF-containing 1,1,1,2-tetrafluoroethane-concentrated fraction to contact at a low temperature with hydrofluoric acid which is an extraction solvent and has an HF concentration equal to or higher than an HF concentration at a water-HF azeotropic point, thereby effecting two-phase separation, and subsequently recovering 1,1,1,2-tetrafluoroethane from the separated lower phase, wherein hydrofluoric acid to be used as the extraction solvent has a concentration of from 38 to 70% by weight, and the extraction and two-phase separation steps are effected at a temperature of from -35.degree. to 35.degree. C. According to the purification process, HF can be recovered economically from a 1,1,1,2-tetrafluoroethane fraction containing a small amount of HF.

REFERENCES:
patent: 2478362 (1949-08-01), Benning
patent: 4911792 (1990-03-01), Manzer et al.

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