Abstract
The catalytic effect of dodecylbenzensulfonic acid (DBSA) on the rate of aluminum extraction with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (DEHEHP) in a paraffin solvent (DOSB) was studied at 298 K. Since DBSA is a strong surface active agent, 1.3 kmol/m3 of 2-ethylhexanol was added to the organic solution as a modifier. The initial aluminum concentration in the aqueous solution was 0.002 kmol/m3. The organic and the aqueous solutions were mixed in a conical flask and shaked in a water bath.Aluminum was extracted in the region above pH 0.5. The distribution coefficient, the ratio of aluminum concentration in the organic phase to that in the aqueous phase, was found to be propotional to [DEHEHP]o2[DBSA]o/[H+]w3. The rate of aluminum extraction was found to be propotional to [Al]w[DBSA]o2/[H+]w2, but did not show any significant dependence on DEHEHP concentration in the organic phase.The addition of DBSA increased the rate of aluminum extraction by 100-500 times, i.e, it took only 0.3-1.2 ks (5-20 min) to get the equilibrium state for the solution of 0.5 kmol/m3 DEHEHP, 0.01 kmol/m3 DBSA and 1.3 kmol/m3 2-ethylhexanol in DOSB, whereas it took more than 0.36 Ms (100 h) to reach the equilibrium for the solution of 0.5 kmol/m3 DEHEHP in DOSB without DBSA.
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