Coking a feedstock comprising a pyrolysis tar and a heavy cracked oil

Abstract

Abstract THE PROCESS FOR THE PRODUCTION OF A HIGH QUALITY PETROLEUM COKE WHICH CAN BE GRAPHITIZED TO OBTAIN A GRAPHITE HAVING A DESIRABLY LOW COEFFICIENT OF THERMAL EXPANSION, COMMONLY REFERRED TO AS NEEDLE GRAPHITE, IS DESCRIBED. THE METHOD COMPRISES THE COKING OF A BLEND OF A THERMALLY OR CATALYTICALLY CRACKED HEAVY OIL HAVING A HIGH AROMATIC CONTENT AS A RESULT OF THE THERMAL OR CATALYTIC CRACKING WITH A QUANTITY OF A PYROLYSIS TAR WHICH IS OBTAINED AS A BYPRODUCT FROM THE HIGH TEMPERATURE, DILUENT CRACKING OF PETROLEUM DISTILLATES TO PRODUCE OLEFINS. IT HAS BEEN OBSERVED THAT A SYNERGISM EXISTS BETWEEN THE PYROLYSIS TAR AND CRACKED HEAVY OIL SO THAT THE PYROLYSIS TARS CAN BE USED IN MUCH GREATER QUANTITIES THAN WOULD BE PREDICTED FROM THE CHARACTERISTICS OF THE COKES PRODUCED BY THE COKING OF THE INDIVIDUAL COMPONENTS. IN A TYPICAL EMBODIMENT, A BLEND COMPRISING FROM 20 TO 60 PERCENT OF PYROLYSIS TAR AND 40 TO 80 PERCENT OF A DECANT OIL FROM CATALYTIC CRACKING IS THERMALLY COKED BY HEATING TO A TEMPERATURE FROM 850* TO ABOUT 1000*F. AND PASSING THE HEATED STOCK TO A DRUM AND PERMITTING THE STOCK TO CRACK TO FORM VAPORS AND COKE THEREIN AT TEMPERATURES OF FROM 830* TO ABOUT 875*F.

Inventors

• 👤 H Folkins

Bibliographic Details