Cellulose acetate propionate ( CAP ) membrane was prepared for the separation of the ethyl tert butyl ether ( ETBE ) / ethanol mixtures. The properties of the membrane were evaluated by the pervaporation separation of the mixtures. 为了分离乙基叔丁基醚(ETBE)和乙醇混合物,得到ETBE产品,研究了乙酸丙酸纤维素膜(CAP)的渗透汽化过程,讨论了温度、浓度等因素对渗透通量和选择性的影响。