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Licensed Unlicensed Requires Authentication Published by De Gruyter December 18, 2014

Performance evaluation of anion exchange resins Purolite NRW-5050 and Duolite A-611 by application of radioisotopic techniques

Bewertung der Leistungsfähigkeit der Ionenaustauschharze Purolite NRW-5050 und Duolite A-611 durch Anwendung radioisotopischer Methoden
P. U. Singare
From the journal Kerntechnik

Abstract

Radioanalytical techniques using 131I and 82Br as tracer isotopes were applied to study the kinetics of iodide and bromide ion-isotopic exchange reactions taking place between the external labeled ionic solution and the resin surface. The results indicate low values of specific reaction rate (min−1), amount of ion exchanged (mmol) and initial rate of ion exchange (mmol/min) for bromide ion-isotopic exchange reaction as compared to that obtained for iodide ion-isotopic exchange reaction. It was observed that for iodide ion-isotopic exchange reaction performed at 35.0 °C, 1 000 g of ion exchange resins and 0.002 mol/L labeled iodide ion solution, the values of specific reaction rate (min−1), amount of iodide ion exchanged (mmol), initial rate of iodide ion exchange (mmol/min) and log Kd were 0.340, 0.394, 0.134 and 20.2 respectively for Purolite NRW-5050 resin, which was higher than the respective values of 0.216, 0.290, 0.063 and 18.2 as that obtained by using Duolite A-611. The results of present investigation indicate that during the two ion-isotopic exchange reactions, for both the resins, there exists a strong positive linear correlation between amount of ions exchanged and concentration of ionic solution; and strong negative correlation between amount of ions exchanged and temperature of exchanging medium. From the results it appears that as compared to Duolite A-611 resins, Purolite NRW-5050 resins shows superior performance under identical experimental conditions.

Kurzfassung

Radioanalytische Verfahren unter Verwendung der radioaktiven Tracerisotope 131I und 82Br wurden zur Untersuchung der Kinetik der Iodid- und Bromid-Ionenaustauschreaktionen zwischen der extern markierten Ionenlösung und der Harzoberfläche verwendet. Die Ergebnisse zeigen niedrige Werte für spezifische Reaktionsraten (min−1), für die Menge ausgetauschter Ionen (mmol) und für die Anfangsrate des Ionenaustauschs (mmol/min) für Bromid-Ionenaustauschreaktionen verglichen mit den Werten für Iodid-Ionenaustauschreaktionen. Es wurde beobachtet, dass für Iodid-Ionenaustauschreaktionen bei 35 °C, 1 000 g Ionenaustauschharz und 0.002 mol/L markierte Iodidionenlösungen, Werte für spezifische Reaktionsraten (min−1), für die Menge ausgetauschter Ionen (mmol), für die Anfangsrate des Ionenaustauschs (mmol/min) und für log Kd jeweils bei 0.340, 0.394, 0.134 und 20.2 für Purolite NRW-5050 Harz lagen, und damit höher waren als die entsprechenden Werte von 0.216, 0.290, 0.063 und 18.2, die bei der Verwendung von Duolite A-611 erhalten wurden. Die Ergebnisse der vorliegenden Untersuchungen zeigen, dass während der Ionenaustauschreaktionen beider Harze eine starke positive lineare Korrelation zwischen der Menge ausgetauschter Ionen und der Konzentration der Ionenlösung vorlag, und eine starke negative Korrelation zwischen der Menge ausgetauschter Ionen und der Temperatur des Austauschmediums. Insgesamt zeigen die Ergebnisse, dass unter identischen experimentellen Bedingungen, Purolite NRW-5050 eine gegenüber Duolite A-611 bessere Leistungsfähigkeit hat.

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Received: 2014-08-14
Published Online: 2014-12-18
Published in Print: 2014-12-18

© 2014, Carl Hanser Verlag, München

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