Coal chemical industry refers to the process of taking coal as raw material and converting coal into gas, liquid and solid fuels as well as chemicals through chemical processing. Mainly includes coal gasification, liquefaction, dry distillation and tar processing and calcium carbide acetylene chemical industry. Coal chemical processing. The chemical structure of organic matter in coal, is mainly aromatic thick ring as the core of the unit, by the bridge bond connected to each other, and with a variety of functional groups of the macromolecular structure, through thermal and catalytic processing, coal can be converted into a variety of fuels and chemical products.