氯乙烯精馏过程模拟优化与节能降耗的研究

针对某聚氯乙烯厂精馏过程中氯乙烯产品纯度低、能耗高的问题,利用化工流程模拟软件Aspen Plus对氯乙烯精馏系统中的T-203塔进行模拟优化,选择适合氯乙烯体系的NRTL模型进行计算,确定理论板数为28块。根据灵敏度分析和正交试验得到最佳操作参数为:回流比为0.8,进料位置为第2块理论板,侧线采出位置为第18块理论板。产品中氯乙烯质量分数达到99.999%,低沸物质量分数小于1×10-6,高沸物质量分数小于5×10-6。同时对精馏系统提出两项节能降耗技术,其中循环水改造技术预计为企业带来经济效益1034.85万元/a,高效导向筛板技术可以有效提高分离效率和生产能力。

Simulation optimization and energy conservation in vinyl chloride distillation

To solve the problems of low purity in production and high energy consumption in a commercial vinyl chloride refining process, the chemical process simulation software Aspen Plus was used to simulate the T-203 column in a vinyl chloride distillation system. The NRTL model, which is suitable for the vinyl chloride system, was selected. The number of theoretical plates requred was 28. The single factor method and the orthogonal experimental analysis method were used in order to obtain the optimum operational parameters: the best reflux ratio was 0.8, the location of the feed was the 2nd theoretical plate, and the side drawing position was the 18th theoretical plate. The mass fraction of vinyl chloride monomer in the product was 99.999%. The low boiling content of the impurities was less than 1×10-6 and the high boiling content was less than 5×10-6. At the same time, two energy saving procedures were proposed for the distillation system. The circulating water transformation technology is expected to save 10.34 million Yuan per year for the plant operators, and the high efficiency guided sieve tray technology significantly improves the separation efficiency and production capacity. 