New polymeric membrane materials--polyvinyl amine (PVAm) with different primary amine contents were synthesized By covering polyacrylonitrile(PAN) ultrafiltration membranes with PVAm, the PVAm/PAN composite membranes for CO 2/CH 4 separation were prepared The composite membranes containing more primary amino groups have higher selectivity for CO 2/CH 4 The cross linking of acid or glutaradehyde could improve the gas permselectivity of the composite membranes With decreasing CO 2 content in the feed gas, the CO 2/CH 4 separation factor increased When the feed gas was 25%(vol) CO 2 and 75%(vol) CH 4, the CO 2 permeation rate was 4 1×10 -9 cm 3(STP) ·cm -2 ·Pa -1 ·s -1 , and the CO 2/CH 4 separation factor was
研制成功一种对 CO2 具有促进传递作用的新型膜材料——聚乙烯胺。将此膜材料覆盖在聚砜膜表面制成复合膜。考察了复合膜的多层结构 ,复合膜对 CO2 、CH4、N2 等的吸着性能 ,及复合膜对 CO2 和 CH4的分离透过性能。结果表明 ,该复合膜对 CO2 有很高的吸着量 ,而对其他测试气体仅有极微弱的吸着 ;对 CO2 /
