There is a big gap between China's industry and fo

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There is a big gap between China's PVC industry and foreign countries (I)

after China's entry into WTO, new SLA materials expand market opportunities. Under the situation of international PVC supply exceeding demand, the international competition in the domestic market intensifies. Industry experts pointed out that there is a big gap in participating in international competition from the perspective of the current situation of China's PVC industry. Duan Xiaoping, vice president of China Textile Industry Federation and President of China Chemical Fiber Industry Association, said that

first, the production process is backward, the scale is small, and the concentration of enterprises is low

for a long time, PVC has been the main means of balancing chlorine gas in China. Due to the small and scattered scale of caustic soda plants in China, there were 183 electrolytic caustic soda plants nationwide in 2000, with an average scale of 3.46 × 10 (4th power) tons/year, which makes the development of China's PVC industry in a congenital deficiency. PVC is mainly produced from VCM monomer synthesized by calcium carbide acetylene and HCI, and the energy consumption is as high as 5000kW · H/ton (including electricity for calcium carbide). This process has serious environmental pollution, producing a large amount of carbide slag, waste water, waste mercury catalyst and waste gas, producing 2 tons of dry carbide slag per ton of PVC. A few factories use carbide slag comprehensively to produce cement, and most factories set the recommended material test load at about 70% and 90% of the range of the experimental machine as the best slag disposal site, allowing it to be discharged and polluting the environment. The production cost of PVC by calcium carbide method is high and uncompetitive. When the price of calcium carbide is 2000 yuan/ton, the manufacturing cost of PVC is 5300 yuan/ton (the actual average value from 1997 to 1999), which is 1000 yuan/ton higher than the manufacturing cost of ethylene oxychlorination method on average

second, the system of bar and block division makes it difficult for the chlor alkali industry to combine with petrochemical industry. The experimental machine is specially used to apply torque to samples. In addition, the scale of caustic soda plants in industrialized countries is large, such as 1689 caustic soda production capacity in the United States in 2000 × 10 (4th power) tons/year, with 40 production units, with an average scale of 42 × 10 (4th power) tons/year, of which 5 large chlor alkali enterprises such as Dow Chemical account for 78.6% of the total capacity. The large scale of caustic soda plant is conducive to the combination with petrochemical industry to produce PVC and other organic chlorine products, and it is also convenient for the centralized construction of large-scale VCM and PVC devices. Similarly, only by combining with petrochemical industry can the centralized production of caustic soda be organized and the scale of caustic soda be expanded. (to be continued)

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