【作者】 陈剑； 杨正金； 陈金勋； 韩小龙； 展侠； 李继定；

【Author】 CHEN Jian,YANG Zhengjin,CHEN Jinxun, HAN Xiaolong,ZHAN Xia,LI Jiding (Department of Chemical Engineering,Tsinghua University,Beijing 100084,China)

【机构】 清华大学 化学工程系 膜技术工程研究中心；

【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,五种典型的形态硫在硅橡胶中的渗透分通量与选择分离性大小顺序依次为:噻吩>2—甲基噻吩>2,5—二甲基噻吩>丁硫醇>丁硫醚.传质过程与实验结果能够很好吻合,该成果为膜法汽油脱硫深入研究和工业应用奠定了基础.更多还原

【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 menstruate 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 in cross-linked PDMS were measured in the temperature range of 80~ 100℃by inverse gas chromatography.Compared with the experimental results,effects of the molecular structure on the solubility and diffusion of PDMS composite membrane for different organic sulfur compounds were investigated.It is shown from the results obtained in this work that 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 sulphide,and the theoretical results showed good agreement with the experimental results.This work is a foundational contribution to further investigation on gasoline desulfurization and practical industry application.更多还原