The main feature of a distillation process is its efficiency. The gas-liquid bubbling layer formed on the trays and the ongoing mass-exchange process during distillation is influenced by the change of the surface tension gradient during this mass-exchange procedure. Binary mixtures with respect to the change of the surface tension effect can be divided into positive, negative, and neutral ones. In order to assess the effect of surface tension on mass transfer, the stabilization index quantity is applied, representing the product of the liquid phase process momentum and the surface tension gradient in the mixture of the liquid phase. One possibility to express the Marangoni efficiency enhancement ratio by experimental distillation data obtained under identical hydrodynamic conditions in two binary systems, i.e., a positive (methanol-water) and a neutral one (methanol-ethanol), is presented.