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28 h,料液硫含量从200 ng/μL降到10 ng/μL,其平均通量为0.78 kg/(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0.06 kg/(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.
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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