High-pressure mass-transfer coefficients in the liquid phase of the binary systems carbon dioxide-methyl myristate and carbon dioxide-methyl palmitate

Abstract

Mass-transfer coefficients in the liquid phase of the binary systems carbon dioxide-methyl myristate and carbon dioxidemethyl palmitate were determined at 40 and 50 °C and at pressures between 70 bar and the critical pressure of the mixture. The coefficients were measured by observing the absorption rate of carbon dioxide into a falling liquid film. Comparison of the experimental results with isothermal falling-film mass-transfer models shows that the measured coefficients are larger than those calculated, except near the critical point of the mixture. This is a result of the microconvection induced by a temperature change within the film surface, which, in turn, is caused by the release of heat during carbon dioxide absorption. Near the critical point of the mixture, the mass-transfer rates decline sharply.