1982 Volume 8 Issue 6 Pages 677-684
The underlying mechanism for the separation achieved in a nonfoaming adsorptive bubble separation column was studied both experimentally and theoretically by means of a strong and familiar anionic surfactant, sodium dodecylbenzenesulfonate, DBSNa, M.W. = 348.48, and a modified semiempirical mathematical model.
The adsorption rate of dodecylbenzenesulfonic group, DBS-, to the gas-liquid interface was relatively large and could be formulated in terms of the Langmuir adsorption equation.
The concentration profiles of the continuous and the dispersed phases, established in a slender vertical bubble column operating in a concurrent-flow system, were predicted by the present semiempirical model, composed of simultaneous first-order ordinary differential equations, and it was found that the present model is simpler and more convenient for predicting the profiles than is the previous lumped parameter model, in which the liquid-side mass transfer coefficient remains constant irrespective of the retention time of a bubble in the column. The present model enables us to predict the removabilities of the present surfactant.