초록 ▼

This invention is directed to a method and system for purifying hexafluoroethane near its critical temperature and pressure, particularly where the hexafluoroethane contains at least about 1 ppb by weight of a non-volatile residue. A combination of a sand trap, an adsorption assembly made of a glass

This invention is directed to a method and system for purifying hexafluoroethane near its critical temperature and pressure, particularly where the hexafluoroethane contains at least about 1 ppb by weight of a non-volatile residue. A combination of a sand trap, an adsorption assembly made of a glass wool-molecular sieve-glass wool combination, and a filter is used.

대표청구항 ▼

1. 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 19.7.degree. C. to

1. 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 19.7.degree. 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 19.7.degree. C., and at a pressure of from about 100 psig to about 2,000 psig to produce sand and adsorption bed treated hexafluoroethane.