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采用单循环汽液平衡釜测定了常压条件下丙醛-水的二元以及丙醛-水-甘油三元汽液平衡数据。运用MATLAB中求解非线性最小二乘法问题的函数Lsqnonli,结合丙醛-水的二元汽液平衡实验据,迭代出了Margules、Vanlaar、Wilson和UNIQAC四个方程的二元模型参数。通过计算值和实验值的比较,Wilson方程的相对误差均小于5%,故选择Wilson方程为本体系的适合模型。将测定的丙醛-水-甘油三元汽液平衡数据与模型参数带入Wilson方程求得的三元汽液平衡数据相比较,相对误差均小于5%,由此验证了本文Wilson模型参数的可靠性。本文的测定结果和计算结果为丙醛-水-甘油体系的萃取精馏模拟选择了合适的模型,关联得到的Wilson模型参数,为萃取精馏过程的模拟计算打下基础,同时也为丙醛和水混合液的有效分离提供了一定基础数据。
A single-cycle vapor-liquid equilibrator was used to determine the propionaldehyde-water binary and propionaldehyde-water-glycerin ternary vapor-liquid equilibrium data under normal pressure. Using the function Lsqnonli for solving the nonlinear least squares problem in MATLAB and the binary vapor-liquid equilibrium experimental data of propionaldehyde-water, the binary model parameters of Margules, Vanlaar, Wilson and UNIQAC are iterated. By comparing the calculated value with the experimental value, the relative errors of the Wilson equation are less than 5%, so the Wilson equation is chosen as the suitable model for this system. The relative error between the measured three-dimensional vapor-liquid equilibrium data of propionaldehyde-water-glycerol and the three-dimensional vapor-liquid equilibrium data obtained by the Wilson equation is less than 5%, which verifies the Wilson model parameters reliability. In this paper, the results of the calculation and the results of the calculation for the extraction distillation of propionaldehyde-water-glycerol system, select the appropriate model, the associated parameters of the Wilson model, which laid the foundation for the simulation of extractive distillation process, but also for the propionaldehyde and Effective separation of water mixture provides some basic data.