Use of poly(vinyl chloride) as chlorinating agent in recycling of metals

Poly(vinyl chloride) has the formula (CH2CHCI)n- and on combustion in excess air yields HCl, CO2, H2O, and O2. Although these gases may not be suitable for the production of pure HCI, the gases are entirely suitable to treat many metallic scrap and oxide residues to yield products more suitable for recycling or as valuable chemicals.