Marangoni convection in the physical desorption of carbon dioxide from ethanol solvent was studied experimentally. Evolution of the convective structures on the free surface of liquid layers was captured through Schlieren method. Especially

its initial form was captured under appropriate procedures. Each structure changed from approximately round to polygon because of space restriction. Mechanism of the Marangoni convection in mass transfer process was deduced from the luminance distribution of Schlieren images. The emergence

development and fission of a single structure were analyzed qualitatively. Interfacial turbulence caused by the non-uniform mass transfer process led to the deformation of free interface. Finally

the entire surface was filled with polygonal structures with its shape fixed. Fading color in the Schlieren images can reflect the decrease of turbulent intensity during the desorption process

which can be attributed to the change of mass transfer driving force.