| 简介 |
FIELD : organic chemistry, chemical technology.
SUBSTANCE : invention relates to a method for purifying octafluorocyclobutane. Method is carried out by interaction of crude octafluorocyclobutane containing impurities with the impurity-decomposing agent at increased temperature and then with adsorbent that is able to eliminate indicated impurities up to the content less 0.0001 wt.-% from the mentioned crude octafluorocyclobutane. Impurity-decomposing agent comprises ferric (III) oxide and compound of alkaline-earth metal in the amount from 5 to 40 wt.-% of ferric oxide and from 60 to 95 wt.-% of compound of alkaline-earth metal as measured for the complete mass of the impurity-decomposing agent. Ferric (III) oxide represents γ-form of iron hydroxyoxide and/or γ-form of ferric (III) oxide. Impurity represents at least one fluorocarbon taken among the group consisting of 2-chloro-1, 1, 1, 2, 3, 3, 3-heptafluoropropane, 1-chloro-1, 1, 2, 2, 3, 3, 3-heptafluoropropane, 1-chloro-1, 1, 2, 2, 3, 3, 3-heptafluoropropane, 1-chloro-1, 2, 2, 2-tetrafluoroethane, 1-chloro-1, 1, 2, 2-tetrafluoroethane, 1, 2-dichloro-1, 1, 2, 2-tetrafluoroethane, hexafluoropropene and 1H-heptafluoropropane. Adsorbent represents at least one of representatives taken among the group including activated carbon, carbon molecular sieves and activated coal. Crude octafluorocyclobutane interacts with the mentioned impurity-decomposing agent at temperature from 250oC to 380oC. Invention proposes gas, etching gas and purifying gas including octafluorocyclobutane with purity degree 99.9999 wt.-% and above and comprising fluorocarbon impurity in the concentration less 0.0001 wt.-%. Invention provides enhancing purity of octafluorocyclobutane.
EFFECT : improved purifying method.
26 cl, 13 tbl, 10 ex |
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