Coal chemical industry refers to the process of using coal as raw material and chemical processing to convert coal into gas, liquid and solid fuel and chemicals. It mainly includes coal gasification, liquefaction, dry distillation, tar processing and calcite acetylene chemical industry. Coal chemical processing process. The chemical structure of organic matter in coal is a thick ring dominated by aromatics as the unit core. It is connected by bridge bonds and has a macromolecular structure with various functional groups. Through thermal processing and catalytic processing, coal can be converted into various fuels and chemical products.