Azeotropes of chlorofluoroethanes of the formula CF.sub.3 CC1.su

Details Azeotropes of chlorofluoroethanes of the formula CF.sub.3 CC1.su Azeotropes of chlorofluoroethanes of the formula CF.sub.3 CC1.su

1993-11-01

2000-06-20

Fries, Kery

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

Liquid composition

510407, 510415, 570161, 570164, 570170, C11D 318, C11D 343

Patent

active

060778199

ABSTRACT:
A process is disclosed for recovering HF from a product mixture comprising HF and at least one compound having the formula CF.sub.3 CCl.sub.2+x F.sub.1-x (where x is 0 or 1). The process includes the steps of distilling the product mixture to remove all products which have a lower boiling point than the lowest boiling azeotrope containing HF and said at least one compound; and distilling said azeotrope to recover HF as an azeotropic composition containing HF and said at least one compound. Also disclosed are azeotrope and azeotrope-like compositions which consist essentially of hydrogen fluoride in combination with from about 10 to 27 mole percent CCl.sub.3 CF.sub.3 or from about 35 to 56 mole percent CCl.sub.2 FCF.sub.3.

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