The Petroleum Coke is a chunky powdered carbon product derived from petroleum. If this coke is heated to a high temperature, it may emit volatiles such as polynuclear aromatic hydrocarbons, which could be suspect carcinogens. It is a final carbon -rich solid material that derives from oil refining, and is one type of the group of fuels referred to as cokes. It is a byproduct of petroleum refining, useful in the production of electrodes used as carbon anodes. Petroleum Coke is very efficient.