The production process of PVC in China is mainly divided into two processes, one is coal chemical process and the other is petrochemical process. Coal chemical industry mainly refers to industrial production by calcium carbide method. From the source, it is coal. In the production of calcium carbide, calcium carbide is calcined with limestone and coke to obtain calcium carbide, and calcium carbide reacts with water to obtain acetylene. Acetylene reacts with chlorine, another product of chlor-alkali industry, and chlorine also reacts with hydrogen to produce hydrogen chloride to produce vinyl chloride monomer. Its chemical variety is vinyl chloride. Through the reflection of polymerization reaction, the monomer is transformed into polymer to realize PVC products. The process route is complicated and can be divided into three types. One is to change petroleum into naphtha and ethylene, and ethylene is chlorinated in the center to produce VCM monomer. VCM monomer is also obtained by polymerization as in the previous calcium carbide method. The other is the ethylene route, which directly imports VCM monomer, and the production process is relatively simple, and the final product PVC can be obtained by direct polymerization. Another product is imported EDC (dichloroethane). The imported EDC goes through chlor-alkali process to remove hydrogen chloride and achieve vinyl chloride monomer. The final process is also the polymerization process to achieve the final PVC product.