Laboratory Evaluation of High-Temperature Destruction of Polychlorinated Biphenyls and Related Compounds,

摘要

A specialized laboratory technique incorporating a two-stage quartz system was used for determining the thermal destruction properties of PCB's and related compounds. With this system, a small sample was first converted to the gas phase,then exposed to high-temperature destruction conditions. Critical parameters of temperature and residence time were accurately measured. When PCB's were exposed for one second to a series of high-temperature air environments,it was found that initial decomposition occurred at approximately 640C;greater than 95% molecular destruction was obtained at 740C;and 99.995% molecular destruction was found at 1000C. Also,it was determined that PCB's (and certain related compounds) thermally decompose to low molecular weight products,as yet unidentified.