Release of carcinogenic hydrocarbons in the carbonization of coal pitch

Abstract

The carbonization of industrial coal-pitch samples is studied, with particular attention to the liberation and conversion of benz[a]pyrene and other carcinogenic polycyclic aromatic hydrocarbons. The hydrocarbon composition of pitch sublimates and the benz[a]pyrene concentration in the smokestack gases are determined during regular and high-speed carbonization. The maximum benz[a]pyrene content in the smokestack gases is seen at 750-800°C, regardless of its content in the initial pitch. The benz[a]pyrene content basically determines the carcinogenic hazards of pitch processing. © 2012 Allerton Press, Inc.