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Abstract
The anionic (sodium dodecylbenzenesulfonate, Nansa HS-80) and nonionic (oxyethylated nonylphenol, Rokaphenol NX-8) detergents were foamed from their solutions of different initial concentrations. The experimental results were used for the construction of diagrams which were found to be helpful for establishing the number of foaming processes in a multistage system. In another series, solutions of high detergent concentration were foamed in a multistage system. It was found that only the first processes of the multistage experiments gave good agreement with the results found in the diagrams. An explanation of the phenomenon is suggested.