In the OXYCHLORINATION process, EDC is formed by the highly exothermal reaction of ethylene with hydrogen chloride and oxygen.
Either air or oxygen can be used.

OXYCHLORINATION – Oxygen-Lean-Process

The preferred way of OXYCHLORINATION uses oxygen as an oxidizing agent. The catalyst bed is fluidized with circulating gas, the oxygen concentration is kept outside the flammable range (oxygen-lean operation). The very small off-gas stream of inerts and carbon oxides which are formed in the process is fed to the by-product revocery. The reaction mixture consisting of C2H4, HCl and O2 is catalytically converted in the reactor to EDC in a highly exothermal reaction at a temperature above 200 °C. The heat is dissipated via internal cooling coils and recovered to generate steam.

The advantages of the Vinnolit process can be summarized as follows: