Chlorohydrination
Chlorohydrination : The addion of water and chlorine to an olefin to give a chloroalcohol. Thus ethylene produces ethylene chlorohydrin: CH2=CH2 + Cl2 + H2O + CH2OH+CH2Cl + HCl. Chloroalcohols are important intermediates. Propylene chlorohydrin is made similarly and is used for making propylene oxide by hydrolysis with either calcium hydroxide or sodium hydroxide. If calcium hydroxide is used, the byproduct calcium chloride is useless and must be dumped. If sodium hydroxide is used, the byproduct sodium chloride can be recycled to the Castner-Kellner process. (Check source for accuracy of chemical formula)
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