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Ternary liquid-liquid equilibrium data for the systems sulfolane-toluene-pentane and sulfolanebenzene-pentane were obtained at 17, 25, and 50 °C. Experimental tie line data were measured by gas chromtographic analyses and correlated with the nonrandom two liquid (NRTL) and universal quasi-chemical (UNIQUAC) equations.Ternary liquid-liquid equilibrium data are essential for the design of liquid-liquid extraction processes and for the selection of solvents. Sulfolane (tetramethylene sulfone) is widely used as a solvent in the recovery of high-purity aromatics, such as benzene, toluene, and xylenes, from refinery process streams (Deal et al., 1959; Voetter and Kosters, 1966;Broughton and Asselin, 1967). Although relatively little quantitative phase equilibrium data on sulfolane have been published (Hartwig et al., 1955;

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