ABSTRACT
58Aqueous electrolyte solutions have an important role in the chemical industry for various separation techniques. The introduction of inorganic salts has a dramatic effect on mutual solubility of organic solvent in water. The accurate knowledge of phase equilibria plays vital role in designing and selection of separation process. The solubility of alkali metal halides (AMHs), such as sodium fluoride (NaF), sodium chloride (NaCl), sodium bromide (NaBr), potassium chloride (KCl), potassium bromide (KBr), and potassium iodide (KI), in organic solvent and their aqueous binary mixtures have been studied. The experiments have been performed over full range of compositions and at temperature range from 308.15 to 328.15 K. An analytical gravimetric method has been used to measure solubility of studied AMHs. The effects of temperature, composition of binary mixture, and molecular interactions on the solubility have been discussed. Depending upon mixing ratio in binary mixture, the solubility of AMHs was expected to be controlled by molecular interactions existing within the mixture. The experimental solubility was correlated using non-random two-liquid (NRTL) and UNIversal QUAsi Chemical (UNIQUAC) models at all studied temperatures.
