Coal refining

These three glass bottles contain three components which are produced or remain left over from coal refining. The chemical procedure of coal hydrogenation is used to refine the coal and involves producing liquid hydrocarbon from solid coal. This method produces three components: Naphta, petroleum made from hydrocarbon, medium oil, a precursor of middle distillates such as diesel fuel, and vacuum residues, the remains of the coal which are left over during the procedure.