ETHYLENE, ACETYLENE, AN AROMATIC STREAM, AND PETROLEUM COKE ARE PRODUCED BY DISTILLING A CRUDE OIL TO PRODUCE LIGHT PETROLEUM ENDS, A LIGHT NAPHTH, A HEAVY NAPHTHA, AND A LESS VOLATILE REDUCED CRUDE OIL; FEEDING THE LIGHT NAPHTHA STREAM TO A HYDROCARBON PUROLYSIS FURNACE; FEEDING THE HEAVY NAPHTHA STREAM COMBINED WITH A COKER NAPHTHA TO A REFORMER WHERE SULFUR IS REMOVED, THE OLEFINS ARE SATURATED, AND THE NAPHTHENES ARE AROMATIZED, FOLLOWING WHICH AROMATICS ARE EXTRACTED FROM THE REFORMED STREAM LEAVING A MIXTURE OF NORMAL AND ISOPARAFFINS WHICH THEN ENTER THE PYROLYSIS FURNACE. THE PYROLYSIS PRODUCTS ARE SENT TO A SEPARATION TRAIN FROM

WHICH ETHYLENE AND/OR ACETYLENE ARE WITHDRAWN. OILS AND TARS ARE REMOVED FROM THE SEPARATION TRAIN AND INTRODUCED INTO A COKER, WHICH ALSO RECEIVES REDUCED CRUDE AND GAS OIL FROM THE DISTILLATION UNIT AND WHICH PRODUCES COKE, FUEL OIL, FUEL GAS, AND A COKER NAPHTHA WHICH IS COMBINED WITH THE HEAVY NAPHTHA AND FED INTO THE REFORMER.