Measurements and correlation of liquid-liquid equilibrium data for the ternary (3-heptanone + phenol + water) system. (March 2017)

• Record Type: Journal Article
• Authors: Xu, Gaojie; Yang, Deling; Ning, Pengge; Wang, Qingjie; Gong, Fuchun; Cao, Hongbin
• Is Part Of: Journal of chemical thermodynamics. Volume 106(2017)
• Page Start: 295
• Page End: 302
• Publication Date: 2017-03
• Subjects: Phenol -- LLE data -- Correlation -- NRTL model -- UNIQUAC model -- 3-Heptanone; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2016.11.004
• Languages: English
• ISSNs: 0021-9614

Abstract

Highlights: The liquid-liquid equilibrium data for 3-heptanone + phenol + water were measured. The distribution coefficient of phenol and selectivity for solvent extraction efficiency were calculated. The NRTL model (two regression methods) and UNIQUAC model were used to correlate the experimental data with good results. The physical meaning of the regressed binary parameters was explained by intermolecular attractive energy. The activity coefficient of phenol and enthalpy change in extraction process were investigated. Abstract: Liquid-liquid equilibrium (LLE) for the ternary (3-heptanone + phenol + water) system has been determined under atmospheric pressure at 298.15 K, 303.15 K, 318.15 K and 323.15 K. The NRTL and UNIQUAC models were used to correlate the experimental results. The corresponding binary parameters were obtained and their physical meaning is explained by intermolecular attractive energy. The results from the two models agree well with experimental values. The NRTL model was more accurate than that of the UNIQUAC model. Meanwhile, the NRTL model was used to regress all the experimental values at different temperatures simultaneously, which is defined as total-regression. Compared with the individual regression by the NRTL model, the total regression by the NRTL model has fewer parameters and covers a wider interpolated range from 298.15 K to 323.15 K. The distribution coefficient for phenol changes with temperature. The phenol concentration can be expressed as a function of activity coefficient of phenol in both phases. The effect of temperature on the extraction performance of 3-heptanone was also investigated. The phenol extraction process by 3-heptanone is exothermic. The increase of temperature is not a benefit to phenol extraction.