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Random and structured packings were compared for their efficiency in dehumidification of air in a packed column using lithium chloride solutions. Experiments were conducted with cross corrugated cellulose and poly(vinyl chloride) (PVC) structured packings, and the results were compared with the data previously obtained for polypropylene Flexi rings and ceramic Berl saddles as random packings. The heat and mass transfer correlations were developed for both random and structured packings that considered the change in driving force due to the change in LiCl concentration. A dimensional analysis of the process variables was carried out using the Buckingham Pi method to obtain the dimensionless groups of the correlations. The data obtained with 5/8 in. polypropylene Flexi rings, 1/2 in. ceramic Berl saddles, and 2 in. clay Raschig rings (data for 2 in. Raschig rings were taken from Bichowsky and Kelley (1935)) were used to test the correlations for random packings. The correlations for structured packings were tested using the data obtained with cross corrugated cellulose and PVC packings. The values predicted by these correlations were within ±10% of the experimental data.

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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;