Liquid–Liquid Equilibrium for Ternary Systems of Polyoxymethylene Dimethyl Ethers + o-Xylene + Water at 293.15 K

Abstract

Polyoxymethylene dimethyl ethers (PODE n ) are excellent diesel blending components which can eliminate exhaust gas emissions compared to conventional diesel. During the production process of PODE n from methanol and formaldehyde solution, the most important key is to find an appropriate phenomenon for the separation of water and formaldehyde from PODE3–6 in advance. In this work, ternary liquid–liquid equilibrium (LLE) data were determined at T = 293.15 K under atmospheric pressure for the following systems: PODE1 + o-xylene (OX) + water, PODE2 + OX + water, PODE3 + OX + water, and PODE4 + OX + water. Hand and Othmer–Tobias equations were utilized to confirm consistency of the experimental LLE data. The NRTL and UNIQUAC activity coefficient models were applied to correlate the experimental LLE data, and the corresponding binary interaction parameters and LLE phase diagrams were obtained. The results indicate that both NRTL and UNIQUAC models agree well with the experimental LLE data, whereas the NRTL model gives a better agreement than the UNIQUAC model for ternary (PODE1–4 + o-xylene + water) systems.

Measurement and Thermodynamic Modeling of Ternary (Liquid + Liquid) Equilibrium for Extraction of Phenols from Alkane with Furfural

“…Compared with the regression results of the UNIQUAC model, the deviation of the NRTL model is relatively small, indicating that the NRTL model has better consistency for the ternary system. At the same time, it can be seen that in Figures –, there is good agreement between the calculated data and the experimental data. , …”

“…37,38 4. CONCLUSIONS LLE values regarding n-heptane + phenols + furfural systems were investigated at 101.3 kPa at 303.2, 323.2, and 343.2 K. The results indicated that furfural showed extraction capacity for phenol extraction from n-heptane solution.…”

Experimental Determination and Thermodynamic Modeling of Liquid–Liquid Equilibrium for the Ternary Mixture System: Water + 3-Pentanone + Different Solvents at 308.2 K under 101.3 kPa

“… a Standard uncertainties u are u ( T ) = 0.1 K, u ( p ) = 2.3 kPa, u ( w ) = 0.0003. b The binary data were taken from the interpolated data in the literature c The binary data was taken at 303.2 K of the data from the literature d Relative deviation: δ = 100 × ( w exp – w lit )/ w exp . …”