In the air-based oxychlorination process, ethylene and air are fed in slight excess of stoichiometric requirements to ensure high conversion of HCl while minimizing the loss of excess ethylene in the vent stream. Under these conditions, typical feedstock conversions are 94-99 percent for ethylene and - percent for HCl, with EDC selectivities of 94-97 percent. Downstream product recovery involves cooling the reactor effluent by either direct quench or with a heat exchanger, and condensing the EDC and water, which are then separated in a decanter. The remaining gases still contain 1-5 percent EDC by volume and, therefore, are usually further processed in a secondary recovery system involving either solvent absorption or a refrigerated condenser. If ethylene conversion is high, the dilute ethylene remaining in the vent is generally incinerated, but if conversion is low enough to justify it, various schemes may first be used to recover the unconverted ethylene, usually by direct chlorination to EDC.