ZIF-90膜的改性及在油气回收中的应用研究

Study on the modification of ZIF-90/Al_2O_3 membrane and its application in the oil and gas recovery

利用NaBH_4将合成的ZIF-90晶种改性为ZIF-91,并用二次生长法在Al_2O_3支撑体上制备ZIF-90膜和ZIF-91膜。利用XRD、TGA、FT-IR,SEM、BET对合成的粉末及膜进行表征。以N2/n-C_5H_(12)模拟油气体系,将制备的ZIF-90/Al_2O_3膜和ZIF-91/Al_2O_3膜用于油气回收实验。考察了不同操作压力及温度下,2种膜在混合气中的分离性能,结果表明,当操作压力为0.06 MPa、温度为25℃时,ZIF-90膜和ZIF-91膜对N2/n-C_5H_(12)的分离因子分别为2.82、3.98,渗透性分别为5.02×10^(-8)、2.35×10^(-8)mol/m^2·s·Pa,说明改性在一定程度上提高了膜的分离性能。

The synthesized ZIF-90 seeds are modified to ZIF-91 by means of Na BH4,and then ZIF-90 and ZIF-91 membranes have been prepared on the Al2O3 supports by secondary seeds growth methods. The synthesized powder and membranes are characterized by XRD,TGA,FT-IR,BET and SEM. The prepared ZIF-90/Al2O3 and ZIF-91/Al2O3 membranes both have been used in the experiments of oil and gas recovery by using N2/n-C5H12 to imitate oil/gas system,in order to examine two membranes’ separation performance at different operation pressure and temperature. The results show that at 0. 06 MPa and 25℃,the separation factors of ZIF-90 and ZIF-91 membranes are 2. 82 and 3. 98,and their permeability are 5. 02 × 10-8mol/（ m2·s·Pa） and 2. 35 × 10-8mol/（ m2·s·Pa） respectively,which indicates that the modification has improved membrane’s separation performance to a certain extent.