Pathways of Chemical Recycling of Polyvinyl Chloride. Part 2

The review deals with the hydrolysis of polyvinyl chloride waste in media of alkalis and organic bases and with the treatment of chlorine-containing waste in critical media (water, ammonia, methanol, carbon dioxide). The principles and mechanisms of the hydrodechlorination and hydroconversion of polyvinyl chloride/vacuum gas oil mixtures and of the gasification of polyvinyl chloride waste and municipal chlorinated plastic waste are described. Procedures for joint hydrothermal treatment and gasification of polyvinyl chloride waste with biomass and coal and various specific methods for polyvinyl chloride dechlorination are analyzed. The major advantage of hydrothermal treatment of polyvinyl chloride in subcritical water is that the products contain no chlorinated organic compounds. The major advantages of the dehydrochlorination of waste containing polyvinyl chloride are high degree of removal of organic chlorine and high H/C ratio in recycled products.