PPESK中空纤维复合膜对丙烯/丙烷分离性能的研究

Study on PPESK Hollow Fiber Composite Membrane for Olefins and Paraffins Separation

以含二氮杂萘联苯结构的聚芳醚砜酮PPESK（Tg263—305℃）为膜材料，以干-湿相转化法制备中空纤维基膜，采用内涂法涂覆聚乙烯基吡咯烷酮（PVP），并配合Ag＋，制备了促进输送中空纤维复合膜。研究了复合膜聚电解质涂敷时间、2次涂层、不同银盐以及不同过渡金属离子等对复合膜丙烯／丙烷分离性能的影响。实验结果表明．室温下，n（Ag＋）：n（C=O）=1：1，涂敷时间为10min时，复合膜对丙烯／丙烷的分离性最好，PVP／AgNO3体系分离系数为3．98，PVP／AgBF4体系的分离系数为5．69。经过2次涂敷后，PVP／AgNO3体系的分离系数升高至4．20，PVP／Ag-BF4体系的分离系数升高至10．78。由此可见，相同条件下，AgNO3的促进传递效果明显低于AgBF4。

By using polyphthalazinone ether sulfone ketone （PPESK） as membrane matenal, me asymmemc hollow -fiber membranes were formed through dry/wet spinning. The composite membrane was successfully prepared by inner - coating PVP and complexing silver ion. The influences of PVP coating time, second - coating, types of silver salts and transition metals were systematically studied. At room temperature, the composite membrane got the best performance of gas permeation when the coating time was 10 rain and mole ratio of Ag＋ to C = O was 1, propylene / propane selectivity in system PVP/AgNO3 was 3.98, while it in system PVP/AgBF4 was 5.69. After second - coating, propylene/propane selectivity in system PVP/AgNO3 reached 4.20, while that in system PVP/AgBF4 reached 10.78. Thus,the facilitated function of AgBF4 was much better than AgNO3.