Pervaporation performance of crosslinked polydimethylsiloxane membranes for deep desulfurization of FCC gasoline: I. Effect of different sulfur species
Pervaporation performance of crosslinked polydimethylsiloxane membranes for deep desulfurization of FCC gasoline: I. Effect of different sulfur species
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DOI：
10.1016/j.memsci.2008.05.032
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发表时间：
2008-09
影响因子：
9.5
通讯作者：
Jian Chen;Ji-ding Li;Rongbing Qi;H. Ye;Cuixian Chen
中科院分区：
文献类型：
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作者：
Jian Chen;Ji-ding Li;Rongbing Qi;H. Ye;Cuixian Chen
以相转化法制备的非对称PEI膜作为平板复合膜的微孔支撑层，制备了交联PDMS/PEI复合膜。采用反射式FTIR对PDMS/PEI复合膜的不同功能组分进行了表征。用扫描电子显微镜（SEM）对PDMS/PEI复合膜的表面和断面进行了观察。用反相气相色谱法测定了噻吩、2-甲基噻吩、2，5-二甲基噻吩、正丁基噻吩、正丁基硫醚在80-100°C温度范围内的无限稀释活度和扩散系数。采用基团贡献法计算了噻吩、2-甲基噻吩、2，5-二甲基噻吩、正丁基噻吩、正丁基硫醚的溶解度参数，考察了PDMS复合膜对不同有机硫化物的选择性。将制备的复合膜用于正庚烷和不同形态硫的渗透汽化分离。理论计算结果与实验结果吻合较好，不同有机硫化合物的部分透过通量和选择性大小顺序为：噻吩>2-甲基噻吩> 2，5-二甲基噻吩>正丁基噻吩>正丁基硫醚，这对实际应用具有重要意义。
Crosslinked PDMS/PEI composite membranes were prepared, in which asymmetric PEI membrane prepared with phase inversion method was acted as the microporous supporting layer in the flat-plate composite membrane. The different function composition of the PDMS/PEI composite membranes were characterized by reflection FTIR. The surface and section of PDMS/PEI composite membranes were investigated by scanning electron microscope (SEM). The infinite dilute activity and diffusion coefficients of thiophene, 2-methyl thiophene, 2,5-dimethyl thiophene, n-butyl mercaptan, n-butyl sulfide in crosslinked PDMS were measured in the temperature range of 80–100°C by inverse gas chromatography. The solubility parameters of thiophene, 2-methyl thiophene, 2,5-dimethyl thiophene, n-butyl mercaptan, n-butyl sulfide were calculated by the group contribution method and the selectivity of PDMS composite membrane for different organic sulfur compounds was investigated. The composite membranes prepared in this work were employed in pervaporation separation of n-heptane and different sulfur forms mixtures. The theoretical results showed good agreement with the experimental results, and the order of partial permeate flux and selectivity for different organic sulfur compounds was: thiophene>2-methylthiophene>2,5-dimethylthiophene>n-butyl mercaptan>n-butyl sulfide, which should be significant for practical application.