Process for the treatment of a cracking gas from the cracking of 1,2-dichloroethane

Abstract

In a process for the treatment of a cracking gas formed by pyrolysis of 1,2-dichloroethane (EDC), in which the cracking gas is split into its principal components hydrogen chloride (HCl), vinyl chloride (VCM) and unreacted 1,2-dichloroethane (EDC), and these are formed in substantially pure form, where, in the first step of the treatment of the cracking gas, the solids are separated therefrom in a quench zone, the disadvantages of the prior art are intended to be reduced at least partly and in particular the energy losses which usually arise due to the substantial condensation of the quench gas and its re-heating for the purposes of distillative separation are avoided and, due to the circulation of the unreacted EDC at a higher temperature level, the original conversion in the pyrolytic cracking of EDC is intended to be subsequently increased. This is achieved in accordance with the invention in that: the further treatment steps are carried out by means of a rectifying zone, a distillation zone and a stripping zone and a cracking gas condensate which has an increased concentration of 1,2-dichloroethane (EDC) and is free from solids is used as quench liquid in the quench zone.

Dependencies are inferred from the claim text.