Salting-out Ability of Inorganic Salts in Solutions of Ethoxylated Nonylphenols

Abstract

The pattern of changes in the salting-out ability of the salts of nontransition metals and ammonium is established with respect to aqueous solutions of ethoxylated nonylphenols. The anions in the salt play a key role in the process, while cations have almost no effect on the salting-out ability of the salts of singly charged anions. The salting-out effect of anions diminishes in the order \({\text{PO}}_{4}^{{3 - }}\), \({\text{SO}}_{4}^{{2 - }}\), Cl⁻, \({\text{NO}}_{3}^{ - }\), Br⁻, and I⁻. Na⁺, K⁺, \({\text{NH}}_{4}^{ + }\), and Ba²⁺ cations have no pronounced salting-in effect. The salting-in effect diminishes along with the charge of the cation in the order Al³⁺, Mg²⁺, and Li⁺. It is shown that the salting-out ability of salts diminishes as the degree of surfactant ethoxylation grows.