Equilibrium of boron extraction with 2-butyl-2ethyl-1,3-propanediol in 2-ethylhexanol

Boron extraction equilibrium was investigated by using 2-butyl-2-ethyl-1,3-propane-diol (BEPD) dissolved in 2-ethylhexanol as the organic solvent at various boric acid concentrations, extractant concentrations and pH values. The distribution ratio of boron increased with the initial concentration of BEPD in the organic phase for all boron concentrations examined in this study. At each BEPD concentrations, the distribution ratio of boron was constant with minimal effect of boron concentration. The effect of pH on boron extraction with BEPD in 2-ethhylhexanol was also examined, and the results verified the fact that boron extraction with BEPD in 2-ethylhexanol was effective in acidic and weakly alkaline media (pH < 9), but at pH values above 8 boron was stripped from the organic phase.