ON THE PROPERTIES OF SOLID AND LIQUID ION EXCHANGERS X. ION EXCHANGE, WATER UPTAKE AND AGGREGATION OF SALTS OF DINONYLNAPH- THALENE AND DIDODECYLNAPHTHALENE SULFONIC ACIDS

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Abstract
Ion exchange, water uptake and VPO studies have been performed on the two liquid cation exchangers, dinonylnaphthalene and didodecylnaphthalene sulfonic acids and some of their salts. It is found that didodecylnaphthalene sulfonic acid is slightly less aggregated than dinonylnaphthalene sulfonic acid, its water uptake is also less, but the selectivity is about the same. In heptane the presence of water increases the aggregate size, in benzene this increase is smaller and in chloroform no increase is observed. It is also demonstrated that in the concentration range used, the size of a certain aggregate is practically constant. It has been possible to follow the change in aggregate size during the ion exchange process for the system Al3+ - H+. The fact that the three parameter model applies suggests that the interactions at an exchange site are practically independent of aggregate size.

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