METHOD OF PREPARING 1,2-DICHLOROETHANE Russian patent published in 2001 - IPC

FIELD: chemical industry. SUBSTANCE: described is production of dichloroethane by direct chlorination of ethylene in liquid dichloroethane. 1,2-dichloroethane is prepared in vertical two-column reactor with gas-lifting circulation of dichloroethane in vertical circuit into which chlorine and ethylene are added. At reaction zone exit, local hydraulic assistance is built up by means of try to ascending flow of dichloroethane in first column, and pressure of ascending current is reduced to value close to pressure of dichloroethane vapors as they are withdrawn from reactor. In boiling zone located above reaction zone, vapor drip mode f low ascending current of dichloroethane is initiated. Dichloroethane is not allowed to boil in reaction zone by maintaining pressure therein built up by liquid dichloroethane column in second column and also by treating corresponding hydrolytic resistance. Vapor content of vapor-liquid mixture in boiling zone in vapor-drop mode of flow thereof is as high as 0.8-0.95. Motive force of circulation of liquid chloroethane becomes significantly higher in vertical circuit. This enables one to intensify heat take off from reaction zone, increase efficiency and prepare high-grade final product. EFFECT: more efficient preparation method. 3 cl, 2 dwg