| 摘要 |
Hydrogen chloride is freed of water vapour and relatively high boiling gaseous contaminants, e.g. chlorine, hydrogen fluoride, by compressing and cooling the feed gas to condense said contaminants which are then separated by mechanical means or by absorption, following which the partially purified gas is compressed at 7 above its liquefaction pressure and fed at about 30 DEG C. to a fractionating column 8 from the head of which purified hydrogen chloride is withdrawn as product part of which is condensed at 15 and used as reflux whilst the bottoms are withdrawn continuously. The latter may contain chlorine which is vaporized in an evaporator. In the event of chlorine being the only contaminant in the feed mixture, the preliminaty cooling, condensation and separation of the high boiling impurities is dispensed with. Product hydrogen chloride gas may be condensed and fed to a further column for the separation of permanent gases.
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