Green petroleum coke is black or dark grey solid petroleum product with metallic luster,porous and  carbonaceous solid which is formed by tiny crystallized graphite.The components of petroleum coke are hydrocarbons containing 90%-97% carbon,1.5%-8% hydrogen and nitrogen,chlorine,sulfur and heavy metal compounds.

  Petroleum coke is a carbonaceous solid delivered from oil refinery coker units or other cracking processes.Coking processes that can be employed for making petcoke include contact coking, fluid coking, flexicoking and delayed coking. Other coke has traditionally been delivered from coal.