中空纤维膜分离有机混合物中水的研究

利用聚乙烯醇（ＰＶＡ）中空纤维膜，以渗透蒸发技术分离了乙醇－水、叔丁醇－水以及乙醇－叔丁醇－水混合物。根据研究体系的实际，定义了分离系数、渗透通量以及渗透蒸发分离指数的数学表达式，并以此为基准，考察了分离条件与上述分离特性参数间的关系。实验结果表明：渗透蒸发分离指数随温度及供给液浓度的增加呈单调递增趋势，随供给液流速的增加呈先增后减的趋势。

Separation of Water from Organic Mixture with Hollow Fiber Membrane

Hollow fiber membrane is empolyed to separate ethanol water, tert butyl alcohol water, ethanol tert butyl alcohol water mixture with pervaporation technique. The expressions of separation factor, permeation rates and pervaporation separation index are defined mathematically for the system. The relationship of these parameters is examined at separation condition. It is found that the pervaporation seperation index increases monotonically with temperature and concentration of water. A peak is observed when the flow rate is increased.