Abstract
To recover 2-methoxy-phenol in water, C5-C8 alkyl alcohols were selected as extractants to separate water and 2-methoxy-phenol. The liquid–liquid equilibrium (LLE) data for water + 2-methoxy-phenol + {1-pentanol, 1-hexanol, 1-heptanol or 1-octanol} were explored in 303.2 K under 101.3 kPa. The extraction performance of four extractants was assessed through the distribution coefficient (D) and separation factor (S). Meanwhile, the NRTL and UNIQUAC models were used to correlate and fit the data to obtain regression parameters. Furthermore, the mixed surface analysis based on Gibbs energy topology verified that the binary interaction parameters are consistent with the measured data. The LLE data were also predicted through the COSMO-UNIFAC model. The root mean square deviation (RMSD) of the three models do not exceed 0.0023, 0.0030, and 0.0234, respectively, indicating that the NRTL and UNIQUAC models are suitable for the correlation of the studied system and the COSMO-UNIFAC model can be the way to predict the LLE data of the researched system within the scope of this work. In addition, the interaction and interaction energy between component molecules were studied through the DMol3 module.
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