The Mass transfer on three-phase distillation has been investigated. Water -paraffin oil and water-kerosene and paraffin mixture were used as the two immiscible liquids and air as the third phase. Three sieve tray designs were studied in a 600 × 150mm rectangular simulator. Under spray and froth flow regimes

the effects of operating conditions (vapor velocity. liquid rate. oil-water ratio )and tray design (hole diameter and free area)on mass transfer were systematically investigated. Three-phase mass transfer of gas film controlling and liquid film controlling was measured experimentally. It was found that the plate efficiency in spray regime is higher than that in mixed regime

Finally

the correlations of plate efficiency for three- phase mass transfer in spray and mixed regimes were obtained by regression of experimental data.