The production process of polyvinyl chloride resin is divided into petroleum route (ethylene method) and calcium carbide route (calcium carbide method). The former uses petroleum and chlorine as raw materials, and the latter uses coal and crude salt as raw materials. The commonality of the two processes is the final production of chlorine. Vinyl monomer (VCM) is then polymerized to form polyvinyl chloride (PVC).

At present, the PVC industry in Western Europe, North America, the Middle East and other regions widely uses the ethylene method, while the domestic calcium carbide method has developed rapidly, and the production capacity of the calcium carbide method PVC assembly accounts for about 75% of the total domestic production capacity. Compared with the ethylene method, the calcium carbide method has the advantages of less production input, simple process and lower cost. At the same time, China’ “poor oil and rich coal” energy structure and relatively mature calcium carbide production technology provide low-cost raw materials for the calcium carbide route.