Liquid–Liquid Equilibria of Binary, Ternary, and Quaternary Systems Involving Monoethylene Glycol, Water, Toluene, p-Xylene, Hexane, and Octane

Abstract

To prevent gas hydrate formation and the plugging of the pipe, monoethylene glycol, MEG, is injected into the wellhead. To develop the thermodynamic model for the optimization of MEG injection, liquid−liquid equilibrium, LLE, studies are necessary. In the present work, original data are presented of binary, ternary, and quaternary systems involving MEG, water, hexane, octane, toluene, and p-xylene under atmospheric pressure and in the temperature range between 278.15 and 333.15 K. The NRTL thermodynamic model was used for the solubility prediction of binary, ternary, and quaternary systems. The adjustable parameters of the model were determined through regression of binary mixtures data from literature. Experimental and predicted solubilities are in a quite good agreement, in view of the low solubility data involved in the different systems.

Measurement and Thermodynamic Modeling of Ternary (Liquid + Liquid) Equilibrium for Extraction of 2-Methyl-3-buten-2-ol from Aqueous Solution with Different Solvents

“…The corresponding ternary phase diagrams are depicted in Figures – . Those figures show that the studied ternary systems exhibit a Treybal type I ternary phase behavior with one partially miscible system. − The comparison of binary solubility data from literature studies − and this work is tabulated in Table . It is found that the binary solubilities obtained in this work and the literature data give a good agreement.…”

“… a Standard uncertainties u are u ( T ) = 0.1 K, u ( p ) = 1 kPa, and u ( w ) = 0.0030. b The binaries were taken from interpolation of the data from refs , . c The binaries were taken at 303.2 K of the data from refs − . d The binaries were taken at 313.2 K of the data from ref . …”

Liquid–Liquid Phase Equilibria for Quinary, Quaternary, and Ternary Systems {Water + Furfural + Acetic Acid + Cyclopentyl Methyl Ether + CaCl2}: Measurement, Effect of Salt ,and Comparative Study

“… a Taken from ref . b Taken from ref . c Calculated by Aspen Plus using NRTL model. d Taken from ref at T = 298.15 K and atmospheric pressure. e Taken from ref at T = 303.15 K and p = 101.3 kPa. f Taken from ref . g Taken from ref . …”

Liquid–Liquid Equilibrium Data and Correlation for the Quaternary Systems Water + Polyphenol (Hydroquinone, Catechol, and Resorcinol) + Methyl Isobutyl Ketone + Methylbenzene

“…Yang et al measured the LLE data for the systems of MIBK + water + hydroquinone, but the extraction ability for the mixed solvent of MIBK + toluene has not been researched in the literature. There are many studies on the separation process using mixed solvents. − …”