石化-盐化一体化循环经济模式分析与探讨

ANALYSIS AND DISCUSSION ON CIRCULAR ECONOMY OF PETROCHEMICAL AND SALT CHEMICAL INTEGRATION

深入探索和研究石化-盐化一体化循环经济的特征,对比分析石化-盐化一体化项目实施前后的情况。结果表明:采用联合法制聚氯乙烯,可利用干气中的乙烯资源,使副产的氯化氢再利用,并节省外供的电解氢气;用改良氯醇法生产环氧丙烷,使纯碱生产中使用的海水、丙烯的消耗量大大减少,并实现装置环氧丙烷废水、废渣的零排放;对DCC干气和C4的综合利用,使产品的附加值得到提升。说明石化-盐化一体化循环经济模式可以通过工艺流程的总体规划、有机结合和技术创新,实现资源利用最大化和节能减排。

The characteristics of circular economy system based on the integration of petrochemical and salt chemical is discussed in depth, and the situations before and after the implementation of this project are analyzed. Adopting combined process to manufacture PVC, the ethylene in dry gas and the by-product hydrogen chloride all can be used, besides, the supply of electrolytic hydrogen is less. The improved chlorohydrine process for propylene oxide （PO） production can reduce the consumption of soda, seawater and propylene significantly; furthermore, the zero discharge of wastes from PO unit is realized. The comprehensive utilization of DCC dry gas and C4 resource can promote the added value of products. On the whole, by optimizing overall process planning and applying technology innovations, the objective goal of maximum utilization of various resources, less energy consumption and waste discharge could be reached.