Carrier-Mediated Transport Membranes for Gas Separation Processes

为了开发一种高效的气体分离膜，对一些金属离子-液体齐聚物体系进行了载体介导的气体传输研究。在该体系中，液体齐聚物既是金属络合物，又是液膜基质。使用低挥发性溶剂，如液体齐聚物，可以稳定膜的形状。取得的结果如下：1.研究结果。通过向液体聚乙二醇膜中添加碱金属盐，提高了液体聚乙二醇膜对~lt；CO2&gt；的渗透选择性。结果表明，这种增强是由于~lt；CO_2&gt；分子与裸反阴离子之间的酸碱相互作用导致&lt；CO_2&gt；的溶解度增加所致。&lt；Cu^+&gt；-四亚乙基五胺(四)体系促进了&lt；O_2&gt；的运输，该体系以化学计量比Cu：&lt；O_2&gt；=1：1伴随&lt；Cu^+&gt；&lt；-！-&gt；&lt；&lt；Cu^(2+)&gt；周期可逆地吸收&lt；O2&gt；。-lt；Cu^+&gt；-四元体系还促进了CO的迁移，并伴随着a&lt；Cu^+&gt；-羰基络合物的可逆形成。添加~lt；Rh^(3+)&gt；的PEC膜对乙烯和丙烯的选择系数有所提高。在&lt；Rh^(3+)&gt；-PEG体系中加入~lt；KNO_3&gt；，进一步提高了膜的选择性。吸附和渗透测量表明，由于外加盐的盐析效应，~lt；Rh^(3+)&gt；介导的烯烃迁移变得更加明显。

With a view of developing a high efficient membrane for gas separation processes, a carrier-mediated transport of gases was investigated for some metal ion-liquid oligomer systems. In this system, a liquid oligomer acts as a metal complex ligand and, at the same time, as a liquid membrane matrix substance. Employing a low volatile solvent such as liquid oligomer can result in stabilizing the form of the membrane. The results obtained are as follows.1. The permselectivity of <CO_2> through liquid polyethylene glycol (PEG) membrane was enhanced by the addition of alkali metal salts to PEG. It was suggested that the enhancement is attributable to the increase in sulubilities of <CO_2> resulting from the acid-base interaction between <CO_2> molecules and naked counter anions.2. The transport of <O_2> was facilitated by a <Cu^+> -tetraethylenepentamine (tetren) system which absorbs <O_2> reversibly with a stoicheiometry of Cu : <O_2> = 1 : 1 accompanied by a <Cu^+> <<-!->> <Cu^(2+)> cycle.3. The <Cu^+> -tetren system facilitated also the transportation of CO accompanied by the reversible formation of a <Cu^+> -carbonyl complex.4. The permselectivities of ethylene and propylene were improved in the <Rh^(3+)> -added PEC membrane. Addition of <KNO_3> to the <Rh^(3+)> -PEG system resulted in further enhancement of permselectivity. Sorption and permeation measurements demonstrated that the olefin transport mediated by <Rh^(3+)> becomes more predominant as a result of the salting-out effect induced by the added salt.