膜科学与技术

PDMS/PEI复合膜对FCC汽油的脱硫性能(V)传质过程研究

作者：陈剑¹ 宋光武² 陈金勋¹ 唐飞¹ 韩小龙¹ 展侠¹ 李继定¹

单位： 1 清华大学化学工程系膜技术工程研究中心;

关键词： PDMS；反相气相色谱；活度系数；扩散系数；汽油脱硫

出版年,卷(期):页码： 2011,31(2):68-73

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。研究小分子在聚合物中的溶解扩散行为是指导膜材料选择的有效方法，也是研究膜分离机理必不可少的参数，具有非常重要的意义。气相色谱法测定溶剂与聚合物材料之间的相互关系是一个快速、准确、方便的方法。在80℃-100℃温度范围内，采用气相色谱法测定噻吩、2-甲基噻吩、2，5-二甲基噻吩、丁硫醚、丁硫醇五种典型的形态硫及正庚烷在硅橡胶中的无限稀释活度系数和扩散系数，对比膜分离性能的实验数据，分析了不同分子结构及其特点对于聚合物/溶剂体系溶解扩散性能的影响。结果表明，随着温度升高，形态硫的无限稀释活度系数和无限扩散系数都增大。在同一温度下，无限稀释活度系数顺序是：噻吩<2-甲基噻吩<2,5-二甲基噻吩<正庚烷<正丁硫醚<正丁硫醇，无限稀释扩散系数顺序为：噻吩>2-甲基噻吩>2,5-二甲基噻吩>正丁硫醇>正庚烷>正丁硫醚。该成果为膜法汽油脱硫深入研究和工业应用奠定了基础。

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.

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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