Abstract
In the present work, pseudo-emulsion hollow fiber strip dispersion system was used in which the pseudo-emulsion phase consisted of di-2-ethylhexylphosphoric acid as a carrier, n-heptane as an organic solvent and sulphuric acid with thiourea as stripping solution. Experiments were carried out in order to optimize the process dependent factors for the maximum extraction of Hg(II) from aqueous solutions of mercuric chloride using face-centered central composite design (CCF). The three process dependent factors for CCF were mercury concentration in the feed phase, carrier concentration in the membrane phase and sulphuric acid concentration in the stripping phase. The study has also focused on the effects of various other parameters, such as hydrodynamic conditions, volume ratio of the membrane solution to the stripping solution, stirring speed in the pseudo-emulsion tank. Effect of multiple cycles using the same pseudo-emulsion on mercury extraction was also analyzed. A model developed by regression analysis showed that 98% mercury extraction can be achieved from aqueous solutions at the optimum conditions. A mass transfer model was also developed and from that aqueous and membrane resistances were evaluated as 2.3×104sm−1 and 3.9×105sm−1, respectively, under optimum conditions. Hence, membrane diffusion was found to be rate-controlling step.
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