Liquid−Liquid Equilibria of Ternary and Quaternary Systems Including Cyclohexane, 1-Heptene, Benzene, Toluene, and Sulfolane at 298.15 K

Abstract

Liquid−liquid equilibria (LLE) were measured at 298.15 K for six ternary systemsheptane + toluene + sulfolane, heptane + m-xylene + sulfolane, cyclohexane + benzene + sulfolane, cyclohexane + toluene + sulfolane, 1-heptene + benzene + sulfolane, and 1-heptene + toluene + sulfolaneand for two quaternary systemscyclohexane + 1-heptene + benzene + sulfolane and cyclohexane + 1-heptene + toluene + sulfolane. LLE data of two systems including heptane are compared with the results of Cassell et al. (J. Chem. Eng. Data 1989, 34, 434−438). The equilibrium data of four ternary systems including cyclohexane and 1-heptene were used to regress interaction parameters in a nonrandom two-liquid (NRTL) model. These parameters were used to predict equilibrium data of the quaternary systems. The predicted data are in good agreement with experimental ones.

Liquid–liquid equilibrium (LLE) data for ternary mixtures of {aliphatic+p-xylene+[EMpy][ESO4]} at T=313.15K

“…The latter approach is the most common separation technique recently employed in petrochemical industries [3]. Despite its broad application, the toxic and volatile nature of the employed solvents such as sulfolane [1,[5][6][7][8][9][10][11], glycols [12,13] and propylene carbonate [14] as well as the high cost of solvent recovery, makes researchers to seek for other possible solvents. One of the potential candidates to supersede conventional organic solvents is ionic liquid.…”

Ternary liquid–liquid equilibria for mixtures of toluene+n-heptane+an ionic liquid

“…This implicates that there are no suitable separation processes available for process streams with an aromatic content below 20 wt.%. Typical solvents used are polar components such as sulfolane [2][3][4][5][6][7][8][9], N-methyl pyrrolidone (NMP) [8], N-formyl morpholine (NFM), ethylene glycols [9][10][11] or propylene carbonate [9]. Those solvents require additional distillation steps to separate the extraction solvent from both the extract and raffinate phases, and to purify the solvent, with, consequently, additional investments and energy consumption.…”

“…The solvent sulfolane is used as a comparison for this separation, because it is one of the most common solvents for extraction of aromatic hydrocarbons from mixtures of aromatic and aliphatic hydrocarbons used in industry [2][3][4][5][6][7][8][9]. LLE experiments were also carried out with sulfolane, because relevant data for the range in toluene concentrations below 20 mol% were not available.…”

Liquid–liquid equilibria for ternary systems of {cyclohexane+aromatic compounds+1-ethyl-3-methylpyridinium ethylsulfate}

“…(a) {cyclohexane (1) + benzene (2) + solvent (3)}: ( ) [EMpy][ESO4] (this work); (᭹) sulfolane [27]; ( ) [C1mim][DMP] [10]; ( ) [C2mim][DEP] [10]; ( ) [Hmim][DBP] [15], and (b) {cyclohexane (1) + toluene (2) + solvent (3)}: ( ) [EMpy][ESO4] (this work); (᭹) sulfolane[27].…”