Membrane Science and Technology

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Pervaporation performance of polydimethylsiloxane/polyetherimide composite membrane for gasoline desulphurization
(V) Mass transfer process study

Authors： CHEN Jian¹, Song Guangwu², CHEN Jinxun¹, Tang Fei¹, Xia Zhan¹, LI Jiding^*1

Units： 1 Department of Chemical Engineering, Tsinghua University, Beijing, 100084;2 Xinjiang Dushanzi TianLi High & New Tech Co.Ltd, XinJiang, 83360

KeyWords： PDMS; inverse gas chromatography; activity coefficient; diffusion coefficient; gasoline desulfurization

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2011, 31(2):68-73

Abstract：

The membrane separation technology is one of the most efficient separation methods, especially for deep desulfurization of FCC gasoline. Studying the behaviors of the solution and the diffusion of the small molecules in the membranes is an efficient way for directing the choice of membrane materials and it is also a necessary process for the foundation of membrane separation mechanism. Inverse gas chromatography is used to measure behaviors of the solution and the diffusion for the solvent/polymer systems, which is an exact, fast and convenient technique to research the correlation of the polymer/solvent systems. The infinite dilute activity and diffusion coefficients of thiophene, 2-methyl thiophene, 2,5-dimethyl thiophene, n-butyl mercaptan, n-butyl sulfide and heptane in cross-linked PDMS were obtained in the temperature range of 80-100℃ by inverse gas chromatography. The results showed that the order of infinite dilute activity coefficients was: thiophene >2-methylthiophene > 2, 5-dimethylthiophene>heptane > n-butyl sulphide > n-butyl mercaptan, and the order of infinite dilute diffusion coefficients was: thiophene >2-methylthiophene > 2, 5-dimethylthiophene>heptane >n-butyl mercaptan> n-butyl sulphide. This work makes a foundational contribution to further investigation on gasoline desulfurization and practical industry application.

Funds：

国家973项目（2009CB623404）；国家自然科学基金项目（20736003,20906056）；国家863计划项目（2007AA06Z317）和科技部项目（2008EG111021）；教育部博士点基金（20070003130）；国家重点实验室项目（(SKL-ChE-08A01)；中国博士后基金(023201069)。

AuthorIntro：

陈剑（1980－），男，河南信阳人，清华大学化学工程系，博士，助理研究员，从事膜分离研究。

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