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混和气体选择性分离技术一般采用深冷分离法和吸附分离法。节约能耗,简化操作的气体分离方法一直是受人们重视的研究课题。70年代下半期,高分子膜在气体分离方面取得了显著进展,寻找具有实用前景的气体分离膜中的主要困难是:分离性好的膜总是透过速度慢;透过速度快的膜总是分离性能差。金属络合物作为膜材料是已实现的能够同时提高透气率与分离系数的主要方法。金属络合物与气体分子之间的作用被应用于气体分离是从生物体内O_2输送过程而受启发的,血红蛋白中的Fe~(2+)等金属离子选择性地与O_2 形成络合物,同时,在特定条件下又可逆地解离出O_2。最初,人们分离出天然的能与气体分子选择性络合的金属络合物如血红蛋白,用于气体分离研究,进而,人们开始寻找可与气体分子可逆络合的金属络合物。近年来,
Mixed gas selective separation techniques commonly used cryogenic separation and adsorption separation. The gas separation method that saves energy and simplifies operation has always been a research topic that people attach importance to. The second half of the 70s, polymer membranes made significant progress in the gas separation, the search for gas separation membranes with practical prospects of the main difficulties are: the separation of good membrane is always slow transmission rate; the membrane is always fast Poor separation performance. The use of metal complexes as membrane materials has been the main method that has been achieved that simultaneously increases both the air permeability and the separation factor. The interaction between metal complexes and gas molecules is exploited when gas separation is inspired by the O 2 transport in vivo. Metal ions such as Fe 2+ in hemoglobin selectively form complexes with O 2, At the same time, it reversibly dissociates O2 under certain conditions. Initially, the separation of natural metal complexes complexing with gas molecules, such as hemoglobin, was used for gas separation studies, leading to the search for metal complexes that reversibly complex with gas molecules. In recent years,