Drop phase mass transfer coefficients for liquid—liquid systems and the influence of packings

Drop phase mass transfer coefficients have been measured for unhindered motion and for disturbed motion through a vertical regular array of two lines of Raschig rings a short horizontal distance apart. The influence of additions of sodium dodecyl sulphate surfactant has also been investigated. The effect of the Raschig rings is to slow drops down and despite drop distortions and erratic motion the mass transfer coefficient was linearly dependent on drop velocity over a wide range of drop sizes. A new model is proposed to describe mass transfer coefficients for a wide range of drop size, taking contact time and contamination by the surfactant into account.