PVA/PAN hollow fiber composite membrane modules were used as distillation packing for the separation of ethanol-water solution. The mass-transfer separation efficiency of different modules was studied. The experiments show that the separation efficiency of different modules decreases with the increase of heating power supply in the column bottom. Like most hollow fiber membrane contactors, the overall mass transfer coefficient Ky decreases with the increase of packing fraction of the hollow fiber membrane modules. Comparing with the traditional packing used for distillation, the hollow fiber membrane used as packing gives better separation efficiency for the separation of ethanol-water solution, and it could operate in the region over the liquid flooding line of the traditional packing. When the heating power is 120 W and there are 45 hollow fiber composite membranes in the glass tube (inner diameter is 1.6 cm), the height of transferring units (HTU) of this module is 5.64 cm.%以乙醇/水溶液为分离对象,中空纤维PVA/PAN复合膜作为精馏填料,考察了不同膜组件的传质分离效率.实验结果表明:各种组件的分离效率均随塔釜加热功率的增加而减小；和大多数中空纤维膜接触器一样,其总传质系数K、随中空纤维膜组件填充密度(4)的增加而减少；相比于传统精馏填料而言,用中空纤维膜做精馏填料分离乙醇水溶液的分离效果更好,可以在常规填料不能操作的液泛线以上进行操作.当塔釜加热功率为120 W,45根中空纤维膜封装在内径为1.6cm玻璃管中的传质单元高度(HTU)为5.64 cm.
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