Process for the recovery of pyrolysis energy in the preparation of vinyl chloride by incomplete thermal splitting of 1,2-dichloroethane.

摘要

1. Process permitting pyrolytic energy to be recovered in the production of vinyl chloride, wherein liquid 1,2-dichloroethane is preheated under pressure, evaporated and introduced in gaseous form into a cracking zone, subjected to an incomplete thermal cracking reaction therein, the resulting hot cracked gases maintained under pressure are cooled and successively separated into their constituents in a plurality of distilling zones for removal of hydrogen chloride, vinyl chloride, optionally low boilers and high boilers therefrom, and for recovery of unreacted 1,2-dichloroethane, characterized in that the hot cracked gases are cooled in a heat exchanger of which the jacket side a) has material taken from the base portion of a distilling zone as a coolant passed therethrough, the respective distilling zone(s) being heated in heat exchange therewith ; or b) has a heat transfer agent passed therethrough, the heat transfer agent being recycled from the circulation evaporator associated with at least one of the distilling zones, the circulation evaporator of at least one distilling zone being heated by heat exchange therewith, or c) has liquid 1,2-dichloroethane as a coolant passed therethrough which, after absorption of heat, is introduced in gaseous form into the cracking zone.