膜科学与技术

HQDEA-DMMDA型聚醚酰亚胺/二氧化硅混合基质膜的制备及其气体分离性能研究

作者：张立秋，任吉中，李晖，赵丹，邓麦村

单位：中国科学院大连化学物理研究所

关键词： HQDEA-DMMDA型聚醚酰亚胺; 疏水型气相二氧化硅TS-530; 混合基质膜; 气体分离

出版年,卷(期):页码： 2013,33(6):25-31

摘要：

以HQDEA-DMMDA新型聚醚酰亚胺(PEI)为基质膜材料,疏水型气相二氧化硅TS-530为填料,将TS-530分散到聚醚酰亚胺溶液中并采用流延成膜方法,制备出不同质量比PEI/TS-530混合基质膜.与PEI膜相比,TS-530粒子的加入改变了聚合物链段的堆砌,增加了有效自由体积,使H2、CH4、N2、O2以及CO2的渗透系数都得到了增加,同时CO2对CH4、N2以及O2对N2的选择性均未发生较大程度的改变.随TS-530浓度增加,分子动力学直径越大的气体其渗透系数、扩散系数提升幅度越大,这与Maxwell模型发生了较大的偏离,而溶解系数的变化则取决于极性醚氧基团含量以及界面吸附作用.

Poly ether imide(HQDEA-DMMDA) and hydrophobic fumed silica (TS-530) are used to prepare dense PEI/TS-530 mixed matrix membrane by casting method. The introduction of TS-530 can modify the chain packing of PEI/TS-530 and increase the gas permeabilities of H2, CH4, N2, O2 and CO2. With the increase of TS-530 content, the gas permeabilities and diffusion coefficients increase greatly, which deviates from the prediction of Maxwell model. The gas solubility coefficients depend on the ether oxygen groups and the adsorption of the polymer-particle interface. For PEI/TS-530 mixed matrix membranes with different TS-530 content, the selectivities of CO2/N2, CO2/CH4 and O2/N2 do not change obviously.

张立秋(1987-)，女，山东潍坊，硕士，从事膜分离过程研究.?通讯联系人, renjizhong@dicp.ac.c

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