Extraction of Lithium (Li + ) from synthetically prepared sea bittern using di-2-ethyl hexyl phosphoric acid (D2EHPA) and tri-n-butyl phosphate (TBP) as organic extractants has been studied. The equilibrium studies conducted shows synergistic effect between D2EHPA and TBP. The equilibrium constant values for Li + , Na + and K + ions were found to be 95.4×10 -5 m 3 /kmol, 4.6×10 -5 m 3 /kmol and 3.69×10 -5 m 3 /kmol respectively. Hollow fiber supported liquid membrane experiments with low concentration of Li + , Na + and K + ions in feed phase, showed Downloaded by [University of Birmingham] at 02:28 25 June 2016A c c e p t e d M a n u s c r i p t 1 high flux for Li + ions. However at significantly high concentrations of Na + and K + in feed phase, the flux of Li + ions reduced. The model predictions were found in good agreement with the experimental data.

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