Hydrolytic Stability of PhenolFormaldehyde IonExchange Sorbentsстатья
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Дата последнего поиска статьи во внешних источниках: 23 сентября 2013 г.
Аннотация:It is shown that ionexchange sorbents based on phenolformaldehyde resins can be used for a
long time for isolating and separating rare alkali metals without any significant changes in the ionexchange
selectivity and capacity. When the phenol sorbents were used in alkaline solutions at elevated temperatures,
carboxyl groups gradually accumulated in them as a result of the oxidation of methylol groups with oxygen
dissolved in the solution. This led to a considerable increase in the ionexchange capacity of the sorbents and
a simultaneous decrease in the selectivity with respect to the vapors of Cs+–Rb+ and Rb+–K+ ions (it is desir
able to avoid the drying of phenol ionites in air by storing them in a swelled state in closed vessels).