渗透汽化过程分离乙醇-水的模型分析

Mathematical Simulation of Ethanol-water Pervaporation Processes

为了预测渗透汽化过程中渗透通量与渗透液中水的质量分数,对分离乙醇-水体系的连续操作错流型渗透汽化过程建立了数学模型,并在特定操作条件下进行了模拟计算,模拟计算值与实验值基本吻合.对渗透物水的质量分数进行了理论计算,并与实验值进行比较,为操作条件的进一步优化提供了理论依据.利用实验数据分别对乙醇和水的渗透通量进行回归,得到了乙醇和水的质量浓度的三次方程,根据该方程可以对渗透通量进行预测.

Permeate flux and water content in permeate are two important parameters in pervaporation. Mathematical model for continuous cross-flow ethanol-water pervaporation process was developed, and mathematical simulation of the given operating conditions was carried out. The caculation data of water content in permeate agreed well with the experimental data. These contrast can be used to optimize the operating conditions. In addition, the regression equations of permeate flux was developed to optimize the operating conditions. These equations could potentially be used to predict permeate flux in the pervaporation separation of water-ethanol mixture.