Sub-Product

In petroleum coker units, residual oils from other distillation processes used in petroleum refining are treated at a high temperature and pressure leaving the petcoke after driving off gases and volatiles, and separating off remaining light and heavy oils. Petcoke is also produced in the production of synthetic crude oil (Syncrude) from bitumen extracted from oil sands.^[1]

Petroleum coke is a hard solid petroleum product in black or dark gray color, and is characterized by metallic luster and porosity. It is carbon-shaped stuff composed of tiny graphite crystals formed into Granules, columns or needles. The composition of petroleum coke is hydrocarbons, containing 90-97% Carbon, 1.5-8% Hydrogen, and elements such as Nitrogen, Chlorine, and Sulfur.^[2]

1. Petroleum Coke, Wikipedia

2. Petroleum Coke, Sinopec