AQUEOUS TWO-PHASE SYSTEMS OF IONIC LIQUID 1-HEXYL 3-METHYLIMIDAZOLIUM NITRATE AND SODIUM CARBONATE AT DIFFERENT TEMPERATURES: EXPERIMENTAL AND CORRELATION

Ionic liquid-based aqueous two phase system offer an attractive alternative to volatile organic solvents in liquid-liquid extraction. In this work, the binodal curves of aqueous 1-hexyl 3-methylimidazolium nitrate ([Hmim][NO3]) + sodium carbonate (Na2CO3) system have been determined at 288.15, 298.15 and 308.15 K. The Merchuk and two empirical equations were used to correlate the experimental binodal data. These models agreed well with the experimental binodal data. The effects of temperature on the binodal curves were studied, and the two-phase area was found to expand with decrease in temperature.

Keywords:

Aqueous two-phase system , Binodal curves , Ionic liquid , Salt , [Hmim][NO3]