Thermal Diffusion Factor for Diatomic Gas Mixture in Multicomponent System

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Thermal diffusion factor for diatomic gas mixture was expressed in a practical form applicable to multi- component mixture. Thermal diffusion factor for diatomic gas mixtures was obtained directly from thermal diffusion coefficient in multicomponent mixture by using the relation between thermal diffusion coefficient and thermal diffusion factor, and was shown to be the same as that derived by Mason et al. through a “generalized Stefan-Maxwell equation”. The present expression gives a theoretical proof of the previously reported rough estimate of thermal diffusion factor for hydrogen binary mixtures. Comparing with the present expression for H2-HT binary gas mixture, we have found that the previously reported expression for thermal diffusion factor overestimates in a temperature range from 50 to 1,200 K, but the difference between the previous and the present expressions is small. The present expression is essential to the separative analyses of thermal diffusion column for diatomic gas mixture in multicomponent system, and is consistent with the rough estimate for binary mixture of diatomic gases.