On-line surface tension measurements inside stirred reactors

A method as well as an experimental set-up are described allowing on-line s urface tension measurements directly inside stirred reactors at any tempera ture. The method is based on the finding that the difference between the ma ximum and the minimum pressure during bubble formation correlates strongly with the surface tension of the surrounding solution. Examples of applicati ons are given concerning the discrimination of different surfactant solutio ns, the formation of surface-active compounds during chemical reactions, an d emulsion polymerizations,