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It was found that the hydrophobization of the inner surface of a tube offers the stabilization of films of nonfoaming aqueous solutions closing the cross section of the tube. Based on this phenomenon, a modification of the known method of determining adsorption at the solution surface based on the separation of foam films from the solution was proposed for extending the potentialities of this method to nonfoaming solutions. Adsorption of sodium dodecyl sulfate on the aqueous solution–air interface was investigated in the range of low concentrations, which earlier was not easily accessible to measurements by known methods.

The process of bubble separation of substances using large gas bubbles totally closing the cross section of the column was investigated. The use of such bubbles decreases the longitudinal mixing of the solution and drastically increases the separation efficiency. A mathematical model was proposed for describing this process in the batch and continuous operation conditions. The model was tested experimentally.