In order to investigate the heat of adsorption at the interface between surface phase and bulk liquid of sodium lauryl sulfate and sodium dodecylbenzene sulfonate in the bubble-foam adsorptive separation, two equations were derived from the batch analysis around the overhead flow of the batch bubble adsorptive separation under the assumption of ideal solution and monolayer.
Using the experimental data obtained from the batch operation below the concentration of 4 × 10^-3 mol/l sodium lauryl sulfate and sodium dodecylbenzene sulfonate respectively, the heat of adsorption were calculated by two equations.
The heat of adsorption calculated by the equation, which was derived considering the bulk liquid accompanied by the bubbles, was constant within the range of experimental concentration and was coincided with the value calculated by surface excess.