Carrier-Mediated Transport Membranes for Gas Separation Processes

为了开发一种高效的气体分离膜，研究了一些金属离子-液体低聚体系中载流子介导的气体输运。在该体系中，液体低聚物作为金属配合配体，同时作为液体膜基质物质。采用低挥发性溶剂，如液体低聚物，可使膜的形式稳定。得到的结果如下：1。在液态聚乙二醇（PEG）膜中加入碱金属盐，提高了<CO_2>通过PEG膜的选择性。结果表明：<CO_2>分子与裸负离子之间的酸碱相互作用使<CO_2>的溶解度增加。<O_2>的转运是由<Cu^+> -四乙基苯胺（四萜）体系促进的，该体系可逆地吸收<O_2>，其化学计量为Cu: <O_2> = 1:1，并伴有<Cu^+> <<-！->> <Cu^(2+)>循环。<Cu^+> -四萜体系也促进了CO的运输，并伴有<Cu^+> -羰基络合物的可逆形成。在<Rh^(3+)> - PEC膜中，乙烯和丙烯的透选择性得到了提高。在<Rh^(3+)> -PEG体系中加入<KNO_3>可进一步提高其选择性。吸附和渗透测试表明，由于添加盐引起的盐析作用，<Rh^(3+)>介导的烯烃运输变得更加占优势。

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.