Experimental result and data correlation of liquid-liquid equilibrium for methyl isopropyl ketone + o, m, p-dihydroxybenzene + water at 333.15 K, 343.15 K and 353.15 K

Highlights: • Methyl isopropyl ketone is a promising solvent for extracting o, m, p-dihydroxybenzene at high temperatures in the industry. • The experimental data have excellent consistency verified by the Hand equation and the Bachman equation. • A good agreement has been approved between the experiment data and the calculated data from the NRTL and UNIQUAC models. • The effect of temperatures on MIPK extraction efficiency was discussed in detail. -- Abstract: In order to remove the dihydroxybenzene from coal chemical industry wastewater at high temperatures, the liquid-liquid equilibrium data of ternary system methyl isopropyl ketone (MIPK) + o, m, p-dihydroxybenzene + water was measured at 333.15 K, 343.15 K and 353.15 K under 101.3 kPa. The extraction effect of MIPK on dihydroxybenzene was evaluated by the distribution coefficient (D) and the separation factor (S). The Hand equation and the Bachman equation were used for verifying the consistency of the experimental data. Both regression coefficients were higher than 0.99, and it indicated that the experimental data had excellent reliability. Meanwhile, NRTL and UNIQUAC models were applied to correlate experimental liquid-liquid equilibrium data and then the binary interaction parameters were obtained. RMSD values of both models were similar and did not exceed 0.0050. Finally, comparing the extraction effect of MIPK between high and low temperatures, it was found that MIPK also can effectively extract the dihydroxybenzene from wastewater at high temperatures.