Coal chemical industry takes coal as raw material and converts coal into gas, liquid and solid products or semi-products through chemical processing, and then further processes into chemical and energy products. Petrochemical industry is a chemical industry with petroleum and natural gas as raw materials. China is short of oil, short of gas and rich in coal. Coal plays a very important role in national energy strategy. The technology of coal-based chemical industry is developing and gradually replacing some petrochemical products，Such as MTO, coal to glycol, etc.