麦芽糖醇纳滤浓缩过程中膜的污染和清洗再生

采用纳滤方法对麦芽糖醇进行提纯和浓缩,可以节约大量的能耗。文中系统研究了该纳滤过程中操作条件对膜污染的影响,并对膜的清洗和再生效果进行了考察。实验结果表明,膜的污染程度随操作压差和原料液质量分数的增大而加剧,随循环流量和操作温度的升高而减轻。另外,采用常压、循环流量为100—120 L/h,40℃左右的去离子水冲洗30 m in,可达到满意的效果,再将被污染的膜浸泡36 h,基本能使膜纯水通量恢复到使用前的状态。

Fouling and cleaning of membranes in nanofiltration of maltitol purification

In order to save energy,nanofiltration method was utilized in the process of maltitol purification.The effects of operating conditions on membrane fouling were investigated by measuring the water flux.The research on the cleaning and recovery of the membrane was carried out.The best operating condition of the cleaning and recovery were obtained from the experiment.The results show that the fouling of membrane increases with the increasing of operating pressure difference and mass fraction of feed solution,and decreases with the increasing of recycle flow and operating temperature.The fouling of the membrane can be effectively eliminated by washing for 30 minutes with pure water of 100-120 L/h at normal pressure and 40 ℃.The pure water flux of fouled membrane can be almost recovered after being dipped in the pure water for 36 h.