Ether-functionalized ionic liquid based composite membranes for carbon dioxide separation
Ether-functionalized ionic liquid based composite membranes for carbon dioxide separation
复制标题
用于二氧化碳分离的醚功能化离子液体基复合膜
DOI：
10.1039/c6ra04285f
复制
发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Zhang, Suojiang
中科院分区：
文献类型：
--
作者：
Deng, Jing;Bai, Lu;Zhang, Suojiang
二氧化碳与其他轻质气体的有效分离因其在减少温室气体排放方面的重要性以及在气体净化中的应用而受到越来越多的关注。在这项工作中，我们开发了一系列由乙醚功能化的吡啶基离子液体([EnPy][NTf2])和醋酸纤维素(CA)聚合物基质组成的复合膜，以提高CO2的分离性能。采用浇铸法制备了Ca+[EnPy][NTf2]和CA+[CnPy][NTf2]复合膜。测定了CA+IL复合膜的CO2、N-2和CH4的渗透系数，并进一步计算了CO2/N-2和CO2/CH4的选择系数。结果表明，CA+40wt%[E1Py][NTf2]复合膜在CO2/N-2和CO2/CH4的选择系数分别为32和24的条件下，对CO2的透过率提高了近7倍。表征结果表明，CA+[E1Py][NTf2]复合膜的力学性能和热稳定性受到ILS对气体的增塑作用和亲和力的影响，从而导致CO2/N-2和CO2/CH4的渗透系数发生变化。与含有非功能化类似物[CnPy][NTf2]的膜相比，[EnPy][NTf2]的加入提高了CA+IL复合膜的理想渗透系数，但略有降低气体的透过率。
The efficient separation of CO2 from other light gases has received growing attentions due to its importance in reducing greenhouse gas emissions and applications in gas purification. In this work, we developed a series of composite membranes composed of ether-functionalized pyridinium-based ionic liquids ([EnPy][NTf2]) and cellulose acetate (CA) polymer matrices to improve CO2 separation performance. CA + [EnPy][NTf2] and CA + [CnPy][NTf2] composite membranes were fabricated by a casting method. The CO2, N-2 and CH4 permeabilities of the CA + IL composite membranes were measured, and the CO2/N-2 and CO2/CH4 permselectivities were further calculated. The results showed that the CA + 40 wt% [E1Py] [NTf2] composite membrane exhibits approximately a seven-fold increase in CO2 permeability with CO2/N-2 and CO2/CH4 permselectivities of 32 and 24, respectively. The characterization results showed that the mechanical properties and thermal stabilities of the CA + [E1Py][NTf2] composite membranes are affected by both plasticizing effect and affinity of the ILs for the gases, which also lead to the changes in the CO2/N-2 and CO2/CH4 permselectivities. Compared with membranes containing the nonfunctionalized analogues [CnPy][NTf2], the addition of [EnPy][NTf2] improves the ideal permselectivities of CA + IL composite membranes, whereas it decreases slightly the gas permeabilities.