Petroleum coke, or simply petcoke, is a solid residue produced by oil refining. It is obtained from coking, a refinery process from which, by pyroscission and subsequent curing, heavy oil fractions are converted into light products (gas and benzine), medium distillates and residual coke. Historically of little interest to the oil industry, over the years petcoke, driven by the strong diffusion of the coking process and the possibility of making proper energy use in different industrial applications, has achieved such levels of production, which today can be considered to all intents and purposes a real product rather than an inevitable by-product. Read more click.