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Fractional dispersed phase hold‐up and dispersed side mass transfer coefficients for amyloglucosidase were measured in a 56 mm i.d. packed extraction column using a sodium sulphate‐polyethylene glycol 4000 system. Raschig rings (3 to 13.3 mm), Berl saddles (12 mm), Pall rings (12.6 mm), glass spheres (5.2 mm) and structured wire gauze were used as packings. The effect of packing size was investigated in the case of ceramic Raschig rings. The effect of phase composition of the aqueous phase system also was studied. Correlations have been developed for fractional dispersed phase hold‐up and volumetric mass transfer coefficient with packing voidage, dry surface area of packings, superficial dispersed phase velocity and the liquid phase physical properties.

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The terminal velocities and sizes of drops in aqueous two‐phase systems formed by PEG (4000)‐sodium sulphate‐water, PEG (6000)‐sodium sulphate‐water and PEG (4000)‐dextran‐water were measured. Nozzle sizes were varied from 1.0 to 2.5 mm and the drops were formed of both light and heavy phases. Based on video photographic analysis for drop formation, the shape of the drop during formation was found to have an important bearing on the drop volume. Therefore a generalised model was developed using the video photographic measurements. A correlation was developed for the terminal velocities of the drops in aqueous two phase systems, which covers Morton numbers from 0.00211 to 11050 and Eötvös numbers from 0.091 to 288.