COAL TAR AND HYDROCARBON MIXTURE PITCH PRODUCTION USING A HIGH EFFICIENCY EVAPORATIVE DISTILLATION PROCESS

摘要

Described are methods that utilize high efficiency evaporative distillation to make a high softening point coal tar pitch, a quinoline insoluble-free and ash-free coal tar pitch having a desired softening point, and a mesophase coal tar pitch. Each of th e methods uses a feed coal tar pitch having a softening point in the range of 70.degree.C to 160.degree.C. The methods may be carried out using appropriate conventional distillation equipment, a wipe d film evaporator, or a thin film evaporator.