HIGH-PRESSURE MASS-TRANSFER COEFFICIENTS IN THE LIQUID-PHASE OF THE BINARY-SYSTEMS CARBON-DIOXIDE METHYL MYRISTATE AND CARBON-DIOXIDE METHYL PALMITATE

Mass-transfer coefficients in the liquid phase of the binary systems c arbon dioxide-methyl myristate and carbon dioxide-methyl palmitate wer e determined at 40 and 50 degrees C and at pressures between 70 bar an d the critical pressure of the mixture. The coefficients were measured by observing the absorption rate of carbon dioxide into a falling liq uid film. Comparison of the experimental results with isothermal falli ng-film mass-transfer models shows that the measured coefficients are larger than those calculated, except near the critical point of the mi xture. This is a result of the microconvection induced by a temperatur e change within the film surface, which, in turn, is caused by the rel ease of heat during carbon dioxide absorption. Near the critical point of the mixture, the mass-transfer rates decline sharply.