Reaction in ion-exchangers: characterization of the ethylenediamine protonation equilibrium in a sulfonic membrane devoted to carbon dioxide facilitated transport
C. Ahmed , S. Roudesli , M. Métayer , M. Labbé , D. Langevin
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引用次数: 3
Abstract
A method of characterization of the protonation equilibrium of ethylenediamine (EDA) in a cation-exchange membrane is propounded. This method involves an intermediate reaction of the membrane (initially in the mixed EDAH+EDAH22+ form) with gaseous carbon dioxide then the elution and the titration of the carbamic acid formed. This method is more precise and is preferred to the conversion of the sorbed EDAH+ and EDAH22+ into EDA by sodium hydroxide followed by an acidic titration. The selected method allows to calculate accurately the apparent equilibrium constant K∗ of the protonation of EDA in the membrane and is very useful to characterize the carrier (EDAH+) content of membranes conditioned to achieve facilitated transport of carbon dioxide. The data obtained will be used in an improved analysis of this transport process.
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