Method for purifying hexafluoroethane
AssigneeShowa Denko K.K.
InventorsHiromoto Ohno, Tetsuo Nakajo, Toshio Ohi, Tatsuharu Arai
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Abstract
A purification method for purifying hexafluoroethane, comprising a step of making hexafluoroethane containing impurities of hydrofluorocarbons including two carbon atoms in a molecule contact a zeolite having a mean micropore size in a range of 3.5 Å to 11 Å and a silicon/aluminum ratio of not more than 1.5 or an adsorbent comprising the above-described zeolite and a carbonaceous adsorbent having a mean micropore size in a range of 3.5 Å to 11 Å, thereby reducing said hydrofluorocarbons.
Claims9
A method for purifying hexafluoroethane, said method characterized in making hexafluoroethane containing impurities mainly including hydrofluorocarbons having two carbon atoms in a molecule contact a zeolite having a mean micropore size within a range of 3.5 Å to 11 Å and having a silicon/aluminum ratio of not more than 1.5 in a liquid phase so as to reduce said hydrofluorocarbons, wherein the hexafluoroethane containing impurities mainly including hydrofluorocarbons having two carbon atoms in a molecule is produced by a direct fluorination method for letting fluorine gas react with a hydrofluorocarbon having two carbon atoms in a molecule.
Dependencies are inferred from the claim text.