以PEI超滤膜为支撑层,PDMS为复合层,制备PDMS/PEl渗透汽化FCC汽油脱硫复合膜.由于实际汽油组成复杂,根据汽油中形态硫的分布情况,实验选择噻吩、2-甲基噻吩、2,5-二甲基噻吩、乙硫醚、丁硫醇5种典型的形态硫模拟实际汽油体系,考察不同形态硫对膜分离性能的影响.同时,考察了不同料液温度对渗透通量和富硫因子的影响.结合溶解度参数理论,研究了5种形态硫与膜的亲和力,亲和力的大小会影响不同形态硫在膜内的溶解和扩散速率.实验结果表明,在同一操作条件下,5种形态硫的渗透分通量和富硫因子大小顺序为:噻吩＞2-甲基噻吩＞2,5-二甲基噻吩＞正丁硫醇＞正丁硫醚;溶解度参数结果能够很好的解释膜对不同形态硫的选择性,所得结果为渗透汽化技术在汽油脱硫领域的应用提供数据支持.
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