Determination of residual chlorine in liquid phase EDC

The purpose of determining residual chlorine in liquid EDC (ethylene dichloride) is to protect decrease risk of corrosion and damage to production units downstream.

Background
Direct chlorination process involves a reaction between ethylene and chlorine using a catalyst (FeCl3) to synthesize EDC. The effluent from the chlorination reactor is highly corrosive, especially at elevated temperature ranges. As little as from about 100 ppm by weight of free chlorine has a highly corrosive effect on downstream equipment when trace amounts of water are present in the effluent.