ZIF-78膜的制备及其在油气回收中的应用研究  

Preparation of ZIF-78/ZnO Membranes and their Application in Gasoline Vapor Recovery

作　　者：李静[1] 徐荣[1] 姜伟华[1] 陈若愚[1] 钟璟[1] 黄维秋[2] 顾学红[3] 

机构地区：[1]常州大学石油化工学院,江苏常州213164 [2]常州大学石油工程学院,江苏常州213016 [3]南京工业大学材料化学工程国家重点实验室,江苏南京210009

出　　处：《高校化学工程学报》2015年第4期843-850,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21276029);江苏省自然科学基金(BK20131142);江苏省研究生创新基金(CXLX12_0712);南京工业大学材料化学工程国家重点实验室开放课题(KL11-07)项目

摘　　要：采用反应晶种合成方法，在ZnO撑体（锌源）上制备ZIF-78膜，用XRD，TGA，SEM对合成的粉末和膜进行表征。将制备完整的ZIF-78／ZnO膜用于油气分离实验，考察了操作压力，进料浓度，操作温度及切割比对ZIF-78膜分离n-C6H1gN2体系性能的影响，实验表明，膜的分离因子随进料浓度的增加而增大，且分别在0．06MPa、20℃和切割比θ=0．2时达到最大值；膜的渗透系数均随操作压力、进料浓度、操作温度和切割比的增加而增大。实验研究了烷烃（C5～C7）／N2模拟油气体系在不同压力下对膜分离性能的影响，结果表明在操作温度20℃，操作压力0．06MPa，进料浓度30％（V）的条件下，n-C5H1JN2、n-C6H1VN2和n-C7H16／N2的分离因子分别为2．45、2．27和2．13，渗透性分别为9．20×10^-8、6．22×10^-8。3．96×10^-8mol．（m^2．S．Pa）^-1。ZIF-78 membranes were prepared on ZnO supports （zinc source） via a reactive seeding synthesis method, and XRD, TGA and SEM were employed to characterize the synthesized powder and membranes. The prepared ZIF-78/ZnO membranes were applied for gasoline vapor recovery, and the effects of operating pressure and temperature, feed concentration and cutting aspect ratio on the separation performance of the ZIF-78 membranes were investigated. The results show that the separation factor increases with the increase of feed concentration, and it reaches maximum under conditions of feed pressure 0.06 MPa, operating temperature 20℃ and cutting aspect ratio 0.2. The permeability of the membrane increases with the increase of operating pressure, feed concentration, operating temperature and cutting aspect ratio. （C5~C7）/N2 mixtures were used as the model for evaluating membrane performance under different operating pressures. At 20℃, the separation factors of the membrane for B-C512/N2, n-C6H14/N2 and n-C7H16/N2 are 2.45, 2.27 and 2.13 respectively, with corresponding permeability of 9.20×10^-8, 6.22×10^-8 and 3.96×10^-8 mol.（m2·s·Pa）^-1 at a feeding pressure of 0.06 MPa and alkane volume fraction of 30 %（V）.

关 键 词：ZIF-78/ZnO膜 烷烃(C5~C7)/N2分离 油气回收 操作条件 

分 类 号：O614.24[理学—无机化学] TQ028.8[理学—化学]