Abstract
The facilitation of transport by using diffusion–reaction coupling can be applied to ion-exchanger membranes when two conditions are fulfilled: 1. The counterion T z of the membrane is selected in order to play the role of mobile carrier by yielding a reversible combination ST z with the molecular permeant S. The stability of the product ST z has to stand in an optimal range so that the association and dissociation steps occur at both faces of the membrane. 2. The two phases separated by the membrane must be free from ionic species so that the carrier cannot be removed by ion-exchange. This principle is illustrated by two examples each involving a cation-exchanger membrane and ethylenediamine (EDA) as carrier. In the first system, the formation of a carbamic species (EDACO ± 2) allows the facilitated transport of carbon dioxide by the carrier EDAH + (monoprotonated EDA) between two gaseous phases. The second system allows the facilitated transport of EDA between two aqueous solutions. In this case, the carrier is EDAH 2+ 2 (diprotonated EDA) and the intermediate combination is EDAH +.
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