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A divided wall column has been modeled as a Petlyuk column with no heat transfer across the column wall. The feed to the column has been generalized as a mixture of saturated liquid and vapor (0

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The gas sweetening process requires an efficient solvent with strong absorption capability to capture acid gases from flue gas. Absorption can be strong by a chemical formation (as "chemical" absorption) or simple with no chemical reactions (as "physical" absorption). The purpose of the present study was to compare the CO 2 solubility of the chemically absorbing ionic liquid, 1-butyl-3-methylimidazolium acetate ([Bmim][Ac]), with the physically absorbing ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF 4 ]), as a function of temperature at (298.15 to 318.15) K for pressure up to 50 bar. In addition, the CO 2 solubility for binary mixtures containing 75% [BF 4 ] are measured over the same temperature range. Henry's law constants are reported for the solubility of CO 2 in the studied pure and mixed ionic liquids. Furthermore, the density of mixed ionic liquids is experimentally measured in T = 298.15 K, 308.15 K, and 318.15 K. Finally, the partial molar thermodynamic functions of solvation containing Gibbs free energy, enthalpy, and entropy are evaluated based on the variation of Henry's law constants (as a representative of solubility) with temperature.

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