The development and application of two chlorine recycling technologies in polyurethane industry

► Two advanced technologies realizing closed-loop chlorine recycling are introduced. ► A new copper-based catalyst and a fluidized-bed process was developed for converting the by-product HCl gas to Cl2. ► The waste brine generated from the isocyanate plant is recycled as the electrolyte in chlor-alkali industry. ► These two technologies bring significant economic, environmental and societal benefits.