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The present disclosure provides a process and a system for producing dichlorine (C12) reacting a rare -earth metal oxy- chloride with HC1 at a first temperature during a chlorination stage of the process to form rare -earth metal chloride and H2O; removing H2O from the rare -earth metal chloride; and reacting the rare -earth metal chloride with O2 at a second temperature greater than the first temperature during an oxidation stage of the process to form C12 and the rare -earth metal oxy- chloride.