ACM - Activity Coefficients at Infinite Dilution in Non-Electrolyte Mixtures
Activity Coefficients at Infinite Dilution in mixtures allow to judge the effect of a further component on the behavior of a trace component. This is usually calculated from gE-models or equations of state using binary interaction parameters. ACM are about the only data that allow to verify this prediction. Incorrect description of the ACM behavior results e.g. incorrect results for the behavior of trace components in unit operations like distillation. In addition, the ACM data bank contains valuable information on the effects of modulators on the selectivity of an entrainer (e.g. NMP, sulfolane, … with varying amounts of water that allows to tune selectivity and capacity of the extractive solvent).
The picture on the right shows the activity coefficient at infinite dilution of Benzene (3) in a mixture of 1,2-ethanediol (1) with NMP (2). The activity coefficient increases with increasing diol-concentration. This usually increases the selectivity if the 1,2-ethanediol-NMP mixture is used to improve the separation factor between benzene and e.g. a saturated alkane like cyclohexane. Due to the increased polarity of the selective solvent mixture, the capacity drops as soon as the mixture to be separated form a miscibility gap with the solvents.
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Selected Scientific Papers
|1999||Bestimmung von Aktivitaetskoeffizienten bei unendlicher Verduennung mit Hilfe der Dilutor-Technik||Gruber D., Krummen M., Gmehling J.||Journal||Chem.Ing.Tech., 71, 5, 503 508 (1999)|
Selected Scientific Papers (Experimental Data)
|2004||Influence of Water on the Vapor-Liquid Equilibria, Activity Coefficients at Infinite Dilution and Enthalpies of Mixing for Mixtures of n-Methyl-2-Pyrrolidone with C5 or C6 Hydrocarbons||Fischer K., Gmehling J.||Journal||Fluid Phase Equilib., 218, 1, 69 76 (2004)|
|2004||Measurement of Activity Coefficients at Infinite Dilution in n-Methyl-2-Pyrrolidone and n-Formylmorpholine and their Mixtures with Water Using the Dilutor Technique||Krummen M., Gmehling J.||Journal||Fluid Phase Equilib., 215, 2, 283 294 (2004)|
|2000||Measurement of Activity Coefficients at Infinite Dilution in Solvent Mixtures Using the Dilutor Technique||Krummen M., Gruber D., Gmehling J.||Journal||Ind.Eng.Chem.Res., 39, 6, 2114 2123 (2000)|
|1996||Vapor-liquid equilibria, activity coefficients at infinite dilution and heats of mixing for mixtures of N-methyl pyrrolidone-2 with C5 or C6 hydrocarbons and for hydrocarbon mixtures||Fischer K., Gmehling J.||Journal||Fluid Phase Equilib., 119, 7, 113 130 (1996)|