THE INFLUENCE OF CO-CARBONIZATION AGENTS ON THE PERFORMANCE OF PITCH IMPREGNANT

Coal tar pitch was modified by condensation different pressure and sulfurization respectively, and co carbonization with furan resin, durene and petroleum pitch respectively. The influences of different processes and different co carbonization agents on the performance of pitch impregnant were compared. It is expected that pitch impregnant still has good flow properties at high temperature while its coke yield was raised. The results indicated that sulphur made pitch molecules over cross linked, the resulted pitch had low coke yield eventhough it had high soffening point. The pitch condensed at pressure has good impregnating properties. By using co carbonization agents, the performance of pitches can be further improved. Co carbonization with petroleum pitch is of some advantage on economy.