Work

Liquid–Liquid Equilibrium Studies for Potential Solvents/Cosolvents for the Separation of Aromatics and Alkanes

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Liquid–liquid equilibria (LLE) data for ternary systems of n -heptane + a solvent mixture + toluene were measured at 298.15 and 313.15 K and 101.3 kPa. The solvents investigated are mixtures of N -methylpyrrolidone and glycerol, with ratios of N -methylpyrrolidone to glycerol of 90:10, 70:30, and 50:50. LLE measurements were carried out using the direct analytical method, and the composition analysis was performed using gas chromatography. The effectiveness of the solvent mixtures of N -methylpyrrolidone and glycerol in extracting toluene from n -heptane was evaluated by determining the solvent selectivity and capacity and evaluating the extent of the two-phase region. All systems investigated were found to exhibit type I LLE behavior. The binodal curves were correlated to the Hlavatý β function and log γ equations. The tie-lines were correlated with the NRTL and UNIQUAC activity coefficient models. A comparison of the root-mean-square deviation (rmsd) showed that the NRTL model provided a better correlation for all systems.

Source: Journal of Chemical & Engineering Data

DOI: 10.1021/acs.jced.4c00614

Authors: Blessing Mcebo Paile, Caleb Narasigadu, Naadhira Seedat

Institutions: University of Johannesburg, North-West University, University of Pretoria

Language: English

Topic: Phase Equilibria and Thermodynamics

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,500

Funder: National Research Foundation