To recover 2-ethyl-1-hexanol and 1,2-propanediol from waste polyester alcoholysis products, liquid–liquid equilibrium (LLE) data for the ternary system of 2-ethyl-1-hexanol + 1,2-propanediol + (water, n-heptane) at different temperatures (303.2, 313.2, and 323.2 K) were studied at 101.3 kPa. The distribution coefficient (D) and selectivity coefficient (S) were used as indicators to assess the separation effect. The NRTL and UNIQUAC models were used to correlate the experimental data and the root mean square deviation (RMSD) values were calculated to be less than 0.75 and 0.97%, respectively. Finally, the consistency between the experimental data and the regression parameters was verified using the GUI-MATLAB tool. σ-Profiles are used to discuss the interactions of substances in this work. It was found that both extractants could separate and extract 2-ethyl-1-hexanol and 1,2-propanediol effectively, with water being more effective.
Mai Han,Song Lin,Mingyi Xu,Yueyang Jiang,Qingqing Yin,Yufan Pang,Yujian Song,Qingsong Li
In order to extract and refine tetrahydrofurfuryl alcohol (THFA) from water, this work obtained the liquid–liquid equilibrium (LLE) data of THFA in the aqueous solution using 4-Methyl-2-pentanone (MIBK) and 4-Methyl-2-pentanol (MIBC) at 303.2 K, 313.2 K, and 323.2 K under 101.3 kPa. The distribution coefficient ( D ) and selectivity coefficient ( S ) were used to evaluate the effect of extracting THFA from an aqueous solution, and it is found that both two solvents are excellent for the extraction of THFA. The Othmer-Tobias and Hand equations were used to verify the reliability of the LLE data with the linear coefficient was greater than 0.99%. The NRTL and UNIQUAC models successfully correlated the experimental data with the RMSD% values less than 0.57% and 0.56%, respectively. The GUI-MATLAB tool was used to verify the excellent reliability of the regression parameters.
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