Abstract
Tridodecylamine (TDDA) is used as an extractant in benzene for the separation of phenol from the aqueous streams generated from industrial effluents. The effects of aqueous solution pH (at five different pH values, 3 to 11) and concentration of TDDA (at three different compositions, 100 w = 5 to 100 w = 20) in the organic phase are investigated on the distribution coefficient (D). Results show that the neutral phenol molecule is effectively extracted by TDDA into the organic phase by H-bonding. A maximum value of D (5.027, 83.41 %E) is observed at equilibrium pH of 5 and at highest concentration of TDDA (100 w = 20). A mathematical expression for equilibrium D is proposed based on the mass action law, and the apparent equilibrium constants (K) and the stoichiometric coefficient (n) are estimated from the regression of the experimental data. The K and n are found to be 10.17 and 0.60, respectively, at pH of 5. The D values are also predicted and show a good agreement with R2 > 0.99 and SD < 0.0141.
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