Petrochemical industry, referred to as petrochemical industry. Generally refers to the chemical industry that uses oil and natural gas as raw materials. The range is very wide and the products are many. Crude oil undergoes cracking (cracking), reforming and separation to provide basic raw materials such as ethylene, propylene, butene, butadiene, benzene, toluene, xylene, naphthalene, etc. From these basic raw materials, various basic organic raw materials such as methanol, formaldehyde, ethanol, acetaldehyde, acetic acid, isopropanol, acetone, phenol, etc. can be prepared.