Patent ID: 7335806

Claim:
An integrated process for preparing 1,2-dichloroethylene comprising: (a) providing a first reaction zone chosen from a chlorination zone and a thermal cracking zone, and a second reaction zone, (b) introducing organic feed comprising lower aliphatic hydrocarbon, chlorinated derivative of lower aliphatic hydrocarbon, or mixtures of lower aliphatic hydrocarbon and chlorinated derivatives thereof into the first reaction zone, (c) removing first product effluent from the first reaction zone and introducing first product effluent into the second reaction zone, said first product effluent having a heat content sufficient to cause thermal dehydrochlorination of trichloroethane in the second reaction zone, (d) introducing trichloroethane into the second reaction zone and into heat exchange contact with first product effluent introduced into the second reaction zone, thereby to convert at least a portion of said trichloroethane to 1,2—dichloroethylene, and (e) removing second product effluent comprising 1,2-dichloroethylene from the second reaction zone.