The response of differential coefficient of mass transfer and differential rate of mass transfer in dynamic interface layers to the controlled mechanical interface activation has been investigated for inorganic acid (salt) liquid liquid extracting (reverse extracting) systems in the modified Lewis cell It can be seen from the results that periodic mechanical activation in interface layers not only affects the diffused penetrability in phase interfaces

enhances the process of mass transfer between phases

and improve the conditions of mass transfer in phases of liquid liquid systems

but also reduces the error of experiments The formation and development of differential polyphase layers determine the momentum and mass transfer characteristics in phases The result that the activation in phase interfaces is helpful for the formation of Marangoni spontaneous surface convection and other experimental phenomena in literatures are interpreted by using the idea of differential polyphase layers