METHOD FOR PREPARING 1,2-DICHLOROETHANE Russian patent published in 2006 - IPC C07C17/156 C07C19/45 

FIELD: chemical technology.

SUBSTANCE: invention relates to a method for preparing 1,2-dichloroethane. Method involves the oxychlorination reaction of ethylene with hydrogen chloride and oxygen-containing gas and alkaline treatment of dichloroethane also. Before alkaline treatment of 1,2-dichloroethane carbon dioxide is removed that is carried out by decrease of the reaction mixture pressure comprising 1,2-dichloroethane, or by addition of inert gas wherein nitrogen is used, or by heating. Before separation of carbon dioxide the product of the 1,2-dichloroethane-containing the oxychlorination reaction is quenched, cooled and/or condensed. After separation of carbon dioxide the 1,2-dichloethane-containing reaction mixture is treated with an aqueous alkaline solution followed by its separation. The prepared 1,2-dichloroethane-containing reaction mixture is characterized by the content of chloral and/or chloral hydrate less 0.02 wt.-% but preferable less 0.005 wt.-%, and especially preferably, less 0.002 wt.-%. Invention provides reducing consumption of an alkaline solution, prevention of formation of by-side products of chloral and chloral hydrate, and preparing the pure 1,2-dichloroethane with respect to such by-side products.

EFFECT: improved preparing method.

16 cl, 3 dwg, 3 ex