Purification of 1,2-dichloroethane recovered in the incomplete t

Details Purification of 1,2-dichloroethane recovered in the incomplete t Purification of 1,2-dichloroethane recovered in the incomplete t

1980-01-25

1981-03-24

Gantz, Delbert E.

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 75, 203 78, 570262, B01D 334

Patent

active

042578507

ABSTRACT:
The invention relates to a process for purifying 1,2-dichloroethane which is recovered during incomplete thermal cracking to vinyl chloride and contains contaminants boiling at a temperature lower than 83.7.degree. C. under a pressure of 1011 millibars, briefly termed low boilers, and contaminants boiling at a temperature higher than 83.7.degree. 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.degree. to 85.degree. C. with gaseous chlorine and converted to high boilers; pure 1,2-dichloroethane is distilled off overhead from high boilers, in a second distilling zone; and residual dichloroethane is distilled off under reduced pressure from high boiler concentrate, in a third distilling zone, and the high boilers are removed; high boiler-containing effluent coming from the chlorination of low boiler concentrate is introduced into the lower portion of the third distilling zone (FIG. 2 of accompanying drawing).

REFERENCES:
patent: 3876714 (1975-04-01), Coppens
patent: 4060460 (1977-11-01), Smalley et al.

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