Abstract: Effects of temperature on the flux of pure solvents through linear low-density polyethylene（LLDPE）membrane were investigated using a pervaporation setup. Permeation activation energies of five solvents were regressed from experimental data using Arrhenius equation. Equilibrium absorption data of each single solvent in the membrane were obtained from swelling experiment，from which the diffusion coefficients through the membrane of the five solvents at 25 ℃ were calculated. The permeation flux was found in the order of n-hexane > n-heptane > cyclohexane > acetone > n-methyl pyrrolidone（NMP），and the absorption capability in the membrane was in the order of NMP > cyclohexane > n-hexane > n-heptane > acetone.

摘要： 用渗透汽化实验装置测定了5种常用化工溶剂在线性低密度聚乙烯材料中的渗透性能，考察不同温度对于5种溶剂的渗透通量的影响。通过渗透通量与温度的Arrhenius关系，回归拟合得到各种溶剂的渗透活化能；并采用吸附溶胀实验测定了5种纯溶剂在该膜材料中的平衡吸附量，以此推算出25 ℃条件下5种溶剂在膜材料内部的扩散系数。结果表明，5种溶剂的渗透通量的顺序为正己烷>正庚烷>环己烷>丙酮>甲基吡咯烷酮，吸附量大小顺序为甲基吡咯烷酮＞环己烷＞正己烷＞正庚烷＞丙酮。