Abstract
Hydrotropes enhance solubility of water-insoluble or sparingly soluble solutes such as o- and p-hydroxyacetophenones (HAPs) in aqueous solutions. The solubility of HAPs is experimentally determined in aqueous solutions of sodium cumene sulfonate (NaCS), sodium p-xylene sulfonate (NaXS), and sodium p-toluene sulfonate (NaPTS). The solubility of phenols increases almost by an order of magnitude at higher concentrations of the hydrotropes in the order NaPTS, NaXS, and NaCS, at a given temperature. The solubility o-HAP was twice that of p-HAP in the NaCS solutions, and a similar trend was observed in other hydrotrope solutions. The solubility data was fitted in the Association model of hydrotropy to estimate the hydrotrope−hydrotrope and hydrotrope−solute interaction parameters. NaCS, the more hydrophobic hydrotrope, shows stronger interaction with the phenols and a higher association constant.
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