Influence of the Temperature on the Liquid–Liquid Equilibria of Heptane + Toluene + Sulfolane and Heptane + m-Xylene + Sulfolane

Abstract

Equilibrium tie line data have been determined at (298.15, 323.15, 348.15, and 373.15) K for the ternary liquid–liquid equilibria (LLE) of heptane + (toluene or m-xylene) + sulfolane systems. The relative mutual solubility of toluene is higher than that of m-xylene in heptane + sulfolane mixtures. The tie line data were correlated with the UNIQUAC and NRTL models. The calculated values based on the UNIQUAC model were found to be better than those based on the NRTL model; the average root-mean-square deviation between the phase composition obtained from experiment and that from calculation was 0.5111 for UNIQUAC compared to 0.6475 for NRTL. The values of selectivity and the distribution coefficient were derived from the equilibrium data at different temperatures.

Separation of benzene from alkanes using 1-ethyl-3-methylpyridinium ethylsulfate ionic liquid at several temperatures and atmospheric pressure: Effect of the size of the aliphatic hydrocarbons

“…In the petrochemical industry, liquid extraction is the most widely used process for the separation of aromatics (benzene, toluene, ethylbenzene, and xylenes) from aliphatic hydrocarbons because this separation process cannot be carried out in an efficient and economic way by distillation, due to the proximity of the boiling points of the hydrocarbons [2]. Some conventional organic chemicals, such as sulfolane [3][4][5][6], N-formyl morpholine [7], N-methylimidazole, or N-ethylimidazole [8], glycols [9][10][11], propylene carbonate [12], or combinations of solvents are used for the extraction of aromatics. However, these organic solvents are generally toxic, flammable and its recovery is difficult.…”

(Liquid+liquid) equilibria for ternary mixtures of (alkane+benzene+[EMpy] [ESO4]) at several temperatures and atmospheric pressure

“…There are several solvents used for the extraction of aromatics such as sulfolane [9][10][11][12], N-formyl morpholine [13], N-methylimidazole, or N-ethylimidazole [14], glycols [15][16][17], propylene carbonate [18], or combinations of solvents to balance selectivity and ability [19]. However, these organic solvents are generally toxic and flammable and the high volatility of these chemicals results in the loss of solvent to the atmosphere.…”

Separation of toluene from alkanes using 1-ethyl-3-methylpyridinium ethylsulfate ionic liquid at T=298.15K and atmospheric pressure

“…The selectivity values are higher than unity for all the studied systems, confirming that this ionic liquidFIGURE 4. Plot of the selectivity of the experimental and literature data against mole fraction for the ternary systems {heptane (1) + toluene (2) + solvent (3)}: s, [EMpy][ESO4] (this work); d, N-formylmorpholine (reference[33]); j, sulfolane (reference[34]); 4, [EMim][NTf2] (reference[10]); h, Ammoeng 102 (reference[15]). …”