To Suppress the Conversion of Ethylene into the Ethylenedichloride (The Last Reaction), the Concentration of Ethylene Is Maintained Atabout 4–6%, and the Solution Is Heated By Steam to the Boiling Point. Next,Aqueous Solution of Ethylene Chlorohydrin Enters the Second Column, Where Itreacts With a 30% Solution of Calcium Hydroxide at 100 °C: the Produced Ethylene Oxide Is Purified By Rectification.The Chlorohydrin Process Allows to Reach 95% Conversion of Ethylenechlorohydrin. the Yield of Ethylene Oxide Is About 80% of the Theoreticalvalue; For 1 Ton of Ethylene Oxide, About 200 Kg of Ethylene Dichloride Isproduced.