Patent ID: 6346138
Filing Date: 2002-02-12
Classification: B01D

Abstract:
A method for purifying hexafluoroethane near its critical temperature and pressure, wherein said hexafluoroethane contains at least about 1 ppb by weight of a non-volatile residue, said method comprisinga) passing said hexafluoroethane to a sand trap bed held at less than about 19.7Â° C. to produce sand-treated hexafluoroethane; and then b) passing said sand treated hexafluoroethane to an adsorption bed assembly comprising a glass wool-molecular sieve-glass wool combination held at a temperature of greater than about 19.7Â° C., and at a pressure of from about 100 psig to about 2,000 psig to produce sand and adsorption bed treated hexafluoroethane.