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Mustard Gas or Dichlordiethyl Sulphide. This was prepared in four stages: Preparation of Ethylene by heating alcohol with an aluminium oxide catalyst at 400'0 C. Preparation of Ethylene-chlor-hydrin, by passing ethylene and carbon dioxide into a 10 per cent. solution of bleaching powder at a temperature below zero centigrade, and subsequent concentration of the product to a 20 per cent. solution.
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