新型聚二甲基硅氧烷膜浸渍SAPO-34分子筛颗粒进行气体分离

Novel polydimethylsiloxane membranes impregnated with SAPO-34 zeolite particles were synthesized using solution casting method and then analyzed by FTIR, TGA, SEM, tensile testing and permeation performances with CO\u003csub\u003e2\u003c/sub\u003e, N\u003csub\u003e2\u003c/sub\u003e, CH\u003csub\u003e4\u003c/sub\u003e, O\u003csub\u003e2\u003c/sub\u003e and H\u003csub\u003e2\u003c/sub\u003e. SAPO-34 impregnation resulted in enhancement of both permeability and selectivity of all the gases up to 30 wt.% loading,; and beyond this threshold, further addition resulted in decline in gas permeation performances. On the basis of permeation performances, 30 wt.% filler impregnated membrane was designated as the best performance membrane, which was further chosen to analyze the effect of feed gas pressure. It has been found that gas permeation properties keep on increasing with the increase in feed gas pressure up to 20 bar. The gas permeability results of CO\u003csub\u003e2\u003c/sub\u003e were then compared with conventional gas permeability models, and it was found that the gas permeability followed Maxwell Model. The best performance membrane was then tested for equimolar mixture of CO\u003csub\u003e2\u003c/sub\u003e/CH\u003csub\u003e4\u003c/sub\u003e at high pressure and found that mixed gas selectivity was considerably lesser than ideal gas selectivity owing to competitive sorption phenomenon between the gases. Finally, the gas permeation properties of the best performance membrane were compared with 2008 Robeson upper bound limits and found that at 20 bar and 25 °C, the gas permeation properties surpassed the upper bound limits for CO\u003csub\u003e2\u003c/sub\u003e/N\u003csub\u003e2\u003c/sub\u003e and O\u003csub\u003e2\u003c/sub\u003e/N\u003csub\u003e2\u003c/sub\u003e separation and approached near to these limits for H\u003csub\u003e2\u003c/sub\u003e/N\u003csub\u003e2\u003c/sub\u003e and CO\u003csub\u003e2\u003c/sub\u003e/CH\u003csub\u003e4\u003c/sub\u003e separation.