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An experimental study of fundamental mass-transfer characteristics was carried out in which acetone was transferred between water and toluene. All possible arrangements were involved; i.e., acetone was transferred in both directions, and both water and toluene were used as dispersed phases. With technical-grade solvents, the transfer rates were 2-10 times higher than calculated for rigid spheres, and on increasing the system purity, this increase grew to between 30 and 70 times. A previously derived empirical equation describes the low transfer rate results, while for the other case only rough estimations are possible due to the extreme sensitivity to small amounts of impurity.

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The available literature data for the drop diameter, hold-up and backmixing coefficients were tested experimentally in a pilot plant size spray column. For all these parameters correlations were found which gave results in agreement with the experimental data so that reasonable prediction is possible. Different equations were compared and the ones giving the best fit are recommended.