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中文摘要：
渗透汽化是一种新型高效的膜分离技术，尤其在汽油深度脱硫技术方面具有独特优势．以PEI超滤膜为支撑层，PDMS为复合层，制备PDMS／PEI渗透汽化FCC汽油脱硫复合膜．通过傅立叶红外光谱仪（FTIR—ATR）对其进行了结构分析，考察了交联前后官能团的变化．通过扫描电子显微镜（SEM）分析了复合膜表面和断面的形态．在以前的工作基础上，将制备的PDMS／PEI复合膜应用于放大实验，在不同的料液体系中考察膜的渗透汽化性能．结果表明，对于正庚烷／噻吩体系，在80℃下连续操作28h，料液硫含量从200ng／μL降到10ng／μL，其平均通量为0．78kg／（m2·h），平均富硫因子为7．6．对于汽油加噻吩体系，平均渗透通量为0．06kg／（m2·h），平均富硫因子为4．8．该成果为膜法汽油脱硫深入研究和工业应用奠定了基础．
英文摘要：
Pervaporation is one of the most effective membrane separation technologies, especially with the significance and possibility for deep desulphurization of fluid catalytic cracking （FCC） gasoline. In this paper, crosslinked polydimethylsiloxane/polyetherimide（PDMS/PEI） composite membranes were prepared, in which asymmetric PEI membrane prepared with phase inversion method acted as the microporous supporting layer in the flat - plate composite membrane. The different function compositions of the PEG/PEI composite membranes were characterized by reflection FTIR. The surface and section of PDMS/PEI composite membranes were investigated by scanning electron microscope （SEM）. Based on our previous studies, the composite membranes prepared in this work were employed in sacle - up process to investigate the pervaporation performance of the membranes in different feed conditions. During the operation of 28 h at 80 ℃ for n - heptane/thiophene mixtures, the feed total sulfur concentration decreased from 200 ng/μL to 10 ng/μL while average total flux and sulfur enrichment factor was 0.78 kg/（m2· h） and 7.6, respectively. Experiment results also demonstrated that the average total flux and sulfur enrichment factor for gasoline/thiophene mixtures was 0.06 kg/（m2· h） and 4.8, respectively. This work would be a foundational contribution to further investigation on gasoline desulfurization and practical industry application.
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