高浓度单糖溶液纳滤分离工艺研究

以葡萄糖溶液为主要原料,用商业卷式纳滤膜研究高浓度单糖溶液纳滤分离过程中料液浓度、操作压力、操作温度3个主要因素对膜分离的影响.在较低浓度下,渗透流率受操作压力影响较大,表现截留率受操作压力影响较小；面在较高浓度下,结果刚好相反.随着温度的升高,压力增大可以加快渗透流率的增加速率,降低表观截留率的下降速率:浓度增大将降低渗透流率的增加速率,将加快表观截留率的降低速率.本研究可为工业生产中综合选择工艺条件以提高处理效率并减少原料损失提供指导.

Nanofiltration Separation of Monosaccharide Solution Under High Concentrations

In this paper,the influence of three operation factors namely feed concentration,operating pressure and temperature on the performance of nanofiltration membrane separation at high solution concentrations is evaluated using glucose aqueous as solution with a commercial spiral-wound nanofiltration membrane.At lower solution concentrations,operating pressure has more impact on permeate volume flux,while less on the rejection.On the other hand,the results are opposite at higher solution concentrations.As the operating pressure increased,the raising rate of permeate volume flux increases with the operating temperature,while the falling rate of rejection reduces with the operating pressure.In the cases of high solution concentrations,the increasing rate of permeate volume flux changing with temperature decreases with operating pressure,and the declining rate of rejection increases with operating pressure.The investigation results in this work provide guidance for optimizing the design and operation conditions for industrial nanofiltration processes thus to enhance the efficiency and reduce the raw material wastage.