Process for making 1,2-dichloroethane

Details Process for making 1,2-dichloroethane Process for making 1,2-dichloroethane

C - Chemistry, Metallurgy

07

C

260/663.2

C07C 19/045 (2006.01) C07C 17/02 (2006.01) C07C 17/383 (2006.01)

Patent

CA 1204787

PROCESS FOR MAKING 1,2-DICHLOROETHANE ABSTRACT OF THE DISCLOSURE The disclosure relates to a process for making and de- contaminating 1,2-dichloroethane by reacting ethylene and. chlorine in a reaction zone having a liquid medium contain- ing chlorinated C2-hydrocarbons circulated therein. To this end, the disclosure provides: a) for approximately equimolar proportions of ethylene and chlorine to be introduced into the circulated liquid medium; for the whole to be reacted in a reaction zone at a temperature of about 75 up to 200°C under a pres- sure of about 1 up to 15 bars, the mean sojourn time of the reaction mixture in the mixing zone and reaction zone being equal to about 1 to 15 hours; b) for a portion of liquid reaction mixture to be removed from the reaction zone and subdivided into two streams, for one of these streams to be passed through a heat exchanger for the abstraction of calorific energy and reduction of its initial temperature, and for it to be re- cycled to the mixing and reaction zone; for the second stream to by introduced into at expansion vessel and for a proportion corresponding to the quantity of reac- tion product formed in the reaction zone to be evapo- rated therein; for resulting vaporous matter to be in- troduced into a fractionating column, unevaporated liquid matter of the second stream being recycled into the liquid medium circulated in the mixing and reaction zone; and c) for 1,2-dichloroethane to be distillatively separa- ted from the vaporous matter introduced into the fractionating column with the use of a portion of the heat energy transferred inside the heat exchanger and for the 1,2-dichloroethane to be removed overhead.

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