Process for removal of chloroform and carbon tetrachloride from chlorinated polyvinyl chloride

摘要

A process is disclosed for continuously stripping chloroform (CHCl.sub. 3) and carbon tetrachloride (CCl.sub.4) contaminants from a slurry of agglomerated particles or macro-granules of chlorinated polyvinyl chloride (CPVC) utilizing a stripping agent chosen from a lower primary alcohol and a lower normally liquid alkane. In this process, the stripping agent has a peculiar affinity for each of these contaminants, does not dissolve or otherwise deleteriously affect the CPVC macro- granules, and efficiently reduces the level of the contaminants in the CPVC to less than 10 ppm each of CHCl.sub.3 and CCl.sub.4, based on solid resin.