Separation Of Thiophene By Membrane Of Metallic Ions Loading Pebax Via Pervaporation

With environmental degradation and more and more rigid rule in environmental protection in recent years, research of effective and economic desulfurization technology for gasoline became increasingly valued, for it, researchers pay close attention to pervaporation.This study, PEBAX2533 was selected to prepare active layer of membrane, the support layer was made by PAN. The n-SiO2,μ-SiO2 and Ag+-SiO2 as filling materials, the filling composite membranes were prepared well, and metallic ions (Ag+, Mn2+) in composite membrane was prepared by impregnation method. The membranes were prepared for removing thiophene from thiophene/n-heptane solution via pervaporation.FTIR、XRD and SEM was used to characterize the composition and morphology structure of μ-SiO2 and Ag+-SiO2. The results of FTIR and XRD showed that Ag+was successfully loaded on μ-SiO2. SEM Showed that those microspheres were spherical particles, the diameter was about 200nm. SEM was also used to characterize the morphology structure of membrane, the results showed that the microspheres were evenly dispersed in the active layer of membrane, and there was no conglobate phenomenon of filler. The active layer and support layer was combined closely.The loading experiment proved that the metallic ions (Ag+, Mn2+) succeed loaded on the composite membranes. The swelling experiment showed that the membranes had favorable adsorption capacity for thiophene. The swelling degree was closely related to the operating temperature, thiophene concentration and filling quantity of particles. The swelling degree increased with the increase of operating temperature and thiophene concentration. The swelling degree of filling composite membrane obtained maximum value with the filling quantity of Ag+-SiO2 was 8wt%(PMSA-8). The separation property of the membrane was investigated by pervaporation experiments. The results showed that the total flux increased with the increasing of operating temperature and thiophene concentration in feed, while the separation factor reduced, simultaneously. At 30℃ with 1000 μg·g-1 of thiophene concentration in feed, the filling composite membrane with PMSA-8 obtained the best separation performance with the total flux 5.627 kg·m-2·h-1 and the separation factor 3.78, respectively. To the composited membrane loading metallic ions, the total flux of AM and MM was 7.5 kg·m-2·h-1 and 7.7 kg·m-2·h-1, respectively, and the separation factors were both 3.7.In conclusion, with Ag+-SiO2 filling and the metallic ions (Ag+, Mn2+) loading, the separation performance of membranes were effectively improved. Among these membranes, MM showed the best performance of pervaporation under the same conditions.