乙酸-水-乙酸正丁酯三相体系的热力学分析与共沸精馏过程模拟

乙酸-水-乙酸正丁酯体系的分离是汽-液-液三相共沸精馏过程，相分裂的判断和精馏塔算法的改进是进行该精馏过程模拟的两个主要问题.本文根据现有的基础数据给出了该体系的逸度和活度因子计算模型，然后讨论了Gibbs自由能的变化规律和热力学稳定性条件，给出了该体系相分裂判据，并得到了完整的相分裂区;最后，根据多相精馏的特点对现有的精馏塔算法进行了改进，对该三元非均相共沸精馏过程进行了数值模拟，所得沿塔温度和各组分浓度分布曲线与工业实测数据吻合.

Thermodynamic analysis and azeotropic distillation simulation for acetic acid-water-butyl acetate system

Separation of acetic acid-water-butyl acetate system is a gas-liquid-liquid three phase azeotropic distillation process, and phase splitting judgment and algorithm improvement are the main issues in distillation simulation. According to published experimental data, rigorous thermodynamic models were presented to predict the activity and fugacity coefficients, and based on Gibbs free energy curves thermodynamic stability was analyzed to obtain a phase splitting criterion and phase splitting region for the acetic acid-water-butyl acetate system. Further, a new algorithm suitable for highly nonideal and multiphase distillation was developed to simulate acetic acid-water-butyl acetate distillation process. The simulation results were verified by comparison with industrial data, and the method was proved to be accurate enough to simulate the existing industrial process.