Three-phase distillation hydrodynamic behaviour was investigated with water and kerosene as the two immiscible liquids and air as the third phase. Experimental studies were carried out on flow-guide sieve trays in a 600 mm x 150mm rectangular perspex simulator. Spray

froth and mixed regimes

and transition regimes were studied. Liquid-liquid mixing was also studied in the experiment. Mathematical correlations for clear liquid height

entrainment rates

pressure drop and other hy-drodynamic parameters are given.