Petroleum and Petrochemical Industry, referred to as petrochemical industry, generally refers to the chemical industry with oil and natural gas as raw materials. It has a wide range of products. Crude oil is cracked (cracked), reformed and separated to provide basic raw materials, such as ethylene, propylene, butene, butadiene, benzene, toluene, xylene, Cai, etc. From these basic raw materals, various basic organic materials can be prepared, such as methanol, methyl ethyl alcohol, ethyl alcohol, acetic acid, isopropanol, acetone, phenol and so on. At present, the advanced and complex petroleum refining technology has more stringent requirements for mechanical seal.