Patent ID: 6124518
Filing Date: 2000-09-26
Classification: A62D

Abstract:
A method for treating a polyvinyl chloride waste material with a halogen reactive material selected from the group consisting of alkali and alkaline earth metal hydroxides, alkali and alkaline earth metal carbonates and mixtures thereof; said method comprising the steps of:a) heating the waste material and a halogen reactive material in a pressure reactor means in the substantial absence of water at a temperature within a range of between 150.degree. and 750.degree. C. that is sufficient to generate in the reactor means an autogenous pressure substantially above atmospheric pressure at which the reactivity between the halogen reactive material and the halogen in the waste material increases such that essentially all halogen in the waste material can be converted to alkali or alkaline earth metal halides, said pressure reactor means comprising means for releasing volatile compounds liberated from the waste material so as to control pressure build-up in the reactor means, said reactor means being otherwise closed; andb) maintaining the pressure reactor means at said pressure and temperature for a time sufficient to convert essentially all halogen in the waste material to the alkali or alkaline earth metal halides.