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The chlorine gas contains moisture, byproduct oxygen, and some hydrogen. In addition, it also contains carbon dioxide and some oxygen and nitrogen from the air leakage via the process or pipelines. Chlorine is first cooled and passed through demisters to remove the water droplets and the particulates of salt. The cooled gas goes to sulfuric acid circulating tower, this stream often goes through dry demisters and then to compressors. The compressed gas is then liquefied at a low temperature. The non condensed gas, called sniff gas, is used for producing hypochlorite or hydrochloric acid.