EVA膜对甲苯/乙醇混合物的溶胀和渗透汽化特性

利用基团贡献法估算了共聚比不同的乙烯 /醋酸乙烯共聚物 (EVA)、甲苯 /乙醇混合物的Hansen溶解度参数 ,以共聚物与混合物两者间的三维及二维溶解度参数分量差为判据 ,分析了二者之间相互作用关系及互溶状况 ,与醋酸乙烯质量分数为 2 8%和 14 %的EVA溶胀实验结果对比 ,估算值与实验结果较一致 .所研制的膜用于分离甲苯 /乙醇混合溶液 ,甲苯为优先透过组分 ,在甲苯的质量分数为 2 %～ 3 5 %之间 ,进料温度为 2 5℃的条件下 ,甲苯渗透通量范围为 5 5～ 90 0 g·m^-2 ·h^-1,而分离因子由 18降到 4 .0 .

PERVAPORATION AND SWELL OF ETHYLENE/VINYL ACEATE COPOLYMER MEMBRANE FOR TOLUENE/ETHANOL MIXTURES

The Hansen solubility parameters of ethylene/vinyl aceate copolymer materials and toulene/ethanol mixtures were calculated through the group contribution method. The interaction properties and mutual solubility between polymer and mixtures were analysed,based on the difference of two- or three-dimensional component of solubility parameters. To compare the results of swelling experiment of EVA14 and EVA28, the estimated values were in agreement with experimental data. The membrane was prepared with EVA28 and used for separating toluenl/ethanol mixture, the results show that the membrane was preferential for permeation of toulene. As the mass fraction of toluene was 2%-35% at 25 ℃ in the feed, the toluene flux increased from 55 g·(m ²·h) ^-1 to 900 g·(m ²·h) ^-1 ,and the separation factor decreased from 18 to 4. The results also show that the selectivity and the flux are related to the temperture of the feed. The quasi-equilibrium criteria of pervaporation were compared with VLE of the toluene/ethanol mixture.