渗透汽化-结晶耦合分离稀溶液中的香兰素

发布时间：2018-03-11 01:34

  本文选题：香兰素　切入点：渗透汽化　出处：《化工学报》2017年08期 　论文类型：期刊论文

【摘要】：以聚醚嵌段共聚酰胺(PEBA2533)为膜材料,采用干法相转化法制备性能优异的高分子膜,用于渗透汽化-结晶耦合(PVCC)分离系统中回收稀水溶液中的香兰素。采用扫描电子显微镜(SEM)对PEBA2533膜的形貌进行表征。考察原料液浓度、温度对膜渗透汽化性能的影响。结果表明:随着溶液浓度的增加,PEBA2533膜溶胀性能增加,说明PEBA2533能够优先吸附香兰素;随原料液浓度增加,香兰素渗透通量增加,分离因子略微下降;原料液温度增加,香兰素渗透通量和分离因子都增加;并通过Arrhenius方程计算得到香兰素比水对温度更加敏感。PVCC系统中控制一级冷凝器温度为2℃时,一级冷凝器中结晶态香兰素通量为39.52 g·m~(-2)·h~(-1),纯度在99%以上。
[Abstract]:Polyether block copolymers PEBA2533) were used to prepare polymer membranes with excellent properties by dry phase inversion method. Vanillin was recovered from dilute aqueous solution in pervaporation and crystallization coupling system. Scanning electron microscopy (SEM) was used to characterize the morphology of PEBA2533 membrane. The effect of temperature on the pervaporation performance of the membrane was studied. The results showed that the swelling property of PEBA2533 membrane increased with the increase of solution concentration, which indicated that PEBA2533 could preferentially adsorb vanillin, and the permeation flux of vanillin increased with the increase of the concentration of raw material solution. The separation factor decreased slightly, the vanillin permeation flux and separation factor increased with the increase of the temperature of the raw material solution, and the results of Arrhenius equation showed that vanillin was more sensitive to temperature than water. The temperature of the first stage condenser was controlled at 2 鈩，

本文编号：1596019