Determination of Thermal Diffusion Factors in Liquid and Gaseous Mixtures from Column Separation Measurements

Abstract

Starting from the Furry, Jones and Onsager basic equations and following a method of successive approximation, a formulation suitable to determine thermal diffusion factors from column steady measurements both in gaseous and liquid mixtures is derived. In the gas case, a proportionality relation, valid for any column type, between the logarithm of the maximum separation factor and the thermal diffusion factor evaluated at an adequate average temperature is obtained. It is shown that this temperature and the proportionality constant are independent of the nature of the gas mixture. For liquid mixtures, the so-called forgotten effect is carefully analysed.