Abstract
The aqueous solubilities of m/p‐aminoacetophenone in different concentrations (0‐3.0 mol/L) of hydrotropes such as diethyl nicotinamide, sodium pseudocumene sulfonate and sodium thiocyanate solutions at different system temperatures (303K to 333K) were studied. The percentage extraction (%E) of m‐ aminoacetophenone from m/p‐aminoacetophenone mixture increases with increase in hydrotrope concentration. A Minimum Hydrotrope Concentration (MHC) in the aqueous phase was required to initiate the significance of the %E of m‐aminoacetophenone. Percentage extraction (%E) is the ratio of moles of m‐aminoacetophenone extracted in presence and absence of a hydrotrope. The sensitivity and feasibility of the proposed process are examined by carrying out solubilization and equilibrium precipitation experiments with the mixtures of various compositions. The effectiveness of hydrotropes was measured in terms of Setschenow constant Ks. The extraction data are also fitted in a polynomial equation as the function of hydrotrope concentration. The solubilized material can be recovered by dilution with water.
Highlights
A range of industrial mixtures having close boiling point isomeric or non isomeric components present a challenging separation problem, as in most cases conventional separation methods cannot be successfully applied
Hydrotrope does not seem to be operative below the Minimum Hydrotrope Concentration (MHC), which may be a characteristic of a particular hydrotropes with respect to each solute
Selective solubilization of isomeric mixtures of m/p- aminoacetophenone were determined in aqueous solutions of several hydrotropes at different hydrotrope concentrations and temperatures
Summary
A range of industrial mixtures having close boiling point isomeric or non isomeric components present a challenging separation problem, as in most cases conventional separation methods cannot be successfully applied. These components usually have similar chemical properties and molecular sizes and comparable volatilities. The present work was initiated for the fundamental study of the global role of hydrotropes in the selective separation of a component from mixtures via solubilization and precipitation techniques. The separation of m/p-aminoacetophenone through solubilization and selective precipitation is important as both these isomers have close boiling points and close melting points. The cheapness and easy availability are other factors considered in the selection of hydrotropes
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