Purification of 1,2-dichloroethane recovered in the...

Details Purification of 1,2-dichloroethane recovered in the... Purification of 1,2-dichloroethane recovered in the...

C - Chemistry, Metallurgy

07

C

202/84, 260/663.

C07C 19/045 (2006.01) C07C 17/38 (2006.01)

Patent

CA 1128075

ABSTRACT OF THE DISCLOSURE: The invention relates to a process for purifying 1,2- dichloroethane which is recovered during incomplete ther- mal cracking to vinyl chloride and contains contaminants boiling at a temperature lower than 83.7°C under a pressu- re of 1011 millibars, briefly termed low boilers, and contaminants boiling at a temperature higher than 83.7°C under a pressure of 1011 millibars, briefly termed high boilers. More particularly, low boilers are distilled off overhead from contaminated 1,2-dichloroethane, in a first distilling zone; a portion of low boiler concentrate is continuously treated at 30 to 85°C with gaseous chlorine and converted to high boilers; pure 1,2-dichloroethane is distilled off overhead from high boilers, in a second di- stilling zone; and residual dichloroethane is distilled off under reduced pressure from high boiler concentrate, in a third distilling zone, and the high boilers are re- moved; high boiler-containing effluent coming from the chlorination of low boiler concentrate is introduced into the lower portion of the third distilling zone (Figure 2 of accompanying drawing).

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