Abstract
In this work, liquid-liquid extraction of phenol from aqueous solutions using primary amine Primene JMT (Primene® JM-T) was investigated. The extraction capability of Primene® JM-T with different diluents, including 3-heptanone, sulfonated kerosene, methyl isobutyl ketone, n-octanol, toluene and petroleum ether was studied. The experimental results indicated that the distribution coefficient of phenol extracted using Primene® JM-T that was diluted in 3-heptanone could reach 101.74 under the pH of 9.2. Moreover, the extraction reaction was exothermic (enthalpy change for the extraction reaction (ΔrHm) was −21.03 kJ/mol). High temperature showed a negative effect on the extraction of phenol. The results also showed that adding mineral salt was conducive to the extraction process, and the extraction efficiency fell in the descending order of: (NH4)2SO4> NaCl > NH4Cl. Two empirical correlations were put forward to quantitatively describe the salting effect. Furthermore, the equilibrium constants of phenol extraction using Primene® JM-T were calculated to be 78.2 L/mol. The phenol was extracted using Primene® JM-T with the possible stoichiometric formula of: [RNH3+⋅PhOH]org, where R represents the alkyl group of the amine.
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