Liquid-liquid equilibria for the extraction of phenols from alkane using ethylene glycol

Research paper by Fangfang Dai, Kun Xin, Yuhe Song, Midong Shi, Haipeng Zhang, Qingsong Li

Indexed on: 14 Mar '16Published on: 04 Mar '16Published in: Fluid Phase Equilibria


The separation of low temperature coal tar can be carried out using extraction technology, especially for the collection of phenols. Liquid-liquid equilibria data for the ternary mixture of 1-Heptane + phenols + ethylene glycol were obtained at 323.15 K and 343.15 K under atmospheric pressure, where phenols refer to phenol, o-cresol, m-cresol and p-cresol. The tie lines were displayed in ternary phase diagrams. The distribution coefficient and selectivity were calculated according to the measured tie-line data. The calculation results revealed that the selectivity was large enough for the extraction application. The root-mean-square deviation (RMSD) value of the NRTL model was a little lower than that of UNIQUAC, demonstrating NRTL can better fit the experimental data.

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