渗透汽化分离异丙醇水溶液传质模型的研究.pdf

渗透汽化分离异丙醇水溶液传质模型的研究 2 1 2 1 1 李春利 ，韩檬 ，赵博 ，张雪梅 ，张卫江 （1.天津大学 化学工程研究所，天津 300072；2.河北工业大学 化工学院，天津 300130） 摘 要：根据 Flory-Huggins 理论和溶解-扩散模型，建立了 323 K 下聚乙烯醇(PVA)膜渗透汽化分离异丙醇 水溶液过程的传质模型，模型计算值与实验值吻合良好。水与 PVA 膜的相互作用参数小于异丙醇与 PVA 膜的 相互作用参数，说明水与膜间相互作用强于异丙醇与膜间的相互作用，水在膜中优先吸附溶解。水的塑化系 数和无限稀释扩散系数都大于异丙醇的，说明水在膜中的溶解能力及扩散能力都大于异丙醇，水在 PVA 膜中 优先透过。异丙醇与水的相互作用参数随异丙醇浓度的升高而增大，说明异丙醇浓度越高，PVA 膜的选择性 越好，渗透汽化分离效果越好。 关键词：渗透汽化；异丙醇水溶液；溶胀平衡；渗透通量；模型 Study on the Transport Model of Pervaporation for Isopropanol/Water Systems 2 1 2 1 1 LI Chun-li ，HAN Meng ，ZHAO Bo ，ZHANG Xue-mei ，ZHANG Wei-jiang (1. Chemical Engineering Research Center, Tianjin University, Tianjin 300072, China; 2. School of Chemical Engineering Technology, Hebei University of Technology, Tianjin 300130, China) Abstract: Based on the Flory-Huggins theory and solution-diffusion model, the model of mass transfer in polyvinyl alcohol (PVA) membrane for isopropanol/water mixtures was established. The calculated values of the model were in a good agreement with experimental values. The interactional parameter between water and PVA membrane was less than that between isopropanol and PVA membrane, which showed that water was preferentially adsorbed and dissolved in PVA membrane. The plasticizing coefficient and infinite dilution diffusion coefficient of water were larger than those of isopropanol, which showed that the dissolution and pervasion of water were greater than those of isopropanol in PVA membrane, so water permeated preferentially. The interactional parameter between water and isopropanol rise with the increase of isopropanol content in the mixture, which showed that the larger isopropanol conte