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. ACM contains 1,424 data sets (9,249 data points) from 58 references for 186 components and 748 different ternary systems (Version 2011). Selected Scientific Papers
Selected Scientific Papers (Experimental Data)
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