Compositions comprising CF.sub.3 CF.sub.2 CHF.sub.2 and their ma

Details Compositions comprising CF.sub.3 CF.sub.2 CHF.sub.2 and their ma Compositions comprising CF.sub.3 CF.sub.2 CHF.sub.2 and their ma

1998-08-20

2000-08-22

Anthony, Joseph D.

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

Liquid composition

510410, 510411, 252 2, 252 67, 252 69, 252 77, 252364, 570164, 570178, C11D 730, C11D 750, B01D 336

Patent

active

061072672

ABSTRACT:
A process is disclosed for recovering HF from a product mixture including HF and CF.sub.3 CF.sub.2 CHF.sub.2. The process involves (1) distilling the product mixture to remove all products which have a lower boiling point than the lowest boiling azeotrope containing HF and CF.sub.3 CF.sub.2 CHF.sub.2 ; and (2) distilling the azeotrope to recover HF as an azeotropic composition containing HF and CF.sub.3 CF.sub.2 CHF.sub.2. Also disclosed are compositions of hydrogen fluoride in combination with an effective amount of CF.sub.3 CF.sub.2 CHF.sub.2 to form an azeotrope or azeotrope-like composition with hydrogen fluoride, (e.g., compositions containing from about 57.1 to 67.2 mole percent CF.sub.3 CF.sub.2 CHF.sub.2).
A process for producing certain compositions comprising

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