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碳酸二乙酯是一种性能优良的绿色溶剂,在锂离子电池行业中应用广泛。以碳酸二甲酯和乙醇为原料,采用反应精馏工艺生产碳酸二乙酯是目前的主流工艺。由于该反应分为两步进行,因此如何调节工艺参数来提高反应物转化率和产品收率是工业生产中的重要问题。本文以实验得出的动力学方程、UNIQUAC热力学模型,应用Aspen Plus流程模拟软件实现了工业实际反应精馏工艺流程的模拟,详细讨论了进料位置、回流比、进料配比等因素对反应精馏塔性能的影响。结果表明,模拟值与实验值吻合良好,在回流比为4.5～5,混合进料第20块板,进料醇酯比2.5:1,反应段(2～31)块板,空速小于0.18 hr~(-1)时,反应精馏塔性能最佳。模拟结果对反应精馏合成碳酸二乙酯的工艺设计和过程优化具有重要指导意义。
Diethyl carbonate is a good performance green solvents, widely used in lithium-ion battery industry. To dimethyl carbonate and ethanol as raw materials, the use of reactive distillation process for the production of diethyl carbonate is the mainstream technology. As the reaction is divided into two steps, how to adjust the process parameters to improve the reactant conversion and product yield is an important issue in industrial production. In this paper, experimental kinetic equation and UNIQUAC thermodynamic model were used in this paper. Aspen Plus flow simulation software was used to simulate the actual industrial reactive distillation process. The effects of feed position, reflux ratio, feed ratio and other factors on the reaction Effect of distillation column performance. The results show that the simulated values are in good agreement with the experimental data. When the reflux ratio is 4.5-5, the feed ratio of the 20th plate, feed alcohol ester ratio of 2.5: 1, reaction zone (2 ~ 31) hr ~ (-1), the best performance of the reaction distillation column. The simulation results have important guiding significance for the process design and process optimization of reactive distillation synthesis of diethyl carbonate.