Cloud Point Foaming Technique for Separation of Nonionic Surfactant from Solution

We explored a novel cloud point foaming technique to separate nonionic surfactant from aqueous solutions with a wide range of surfactant concentrations. The phase transformation of nonionic surfactant micelles at the cloud point changes the foaming behavior of surfactant solutions during foaming and results in excellent separation efficiency in terms of the volume reduction ratio compared to foaming at room temperature.