PREDICTION OF THE TEMPERATURE VS DIFFUSION-COEFFICIENT CURVE IN THE GAS-PHASE

A method is proposed for calculation of the exponent in the equation D /D0 = (T/T0)m based on a rigorous molecular-kinetic theory. The propos ed method predicts the temperature vs. diffusion coefficient curve wit h reliability when there are data on one value of this property. A sem i-empirical correlation was established between the mutual diffusion c oefficient of gases and vapors at T0 = 273 K and the molar mass of the second component of the mixture. The D273 for a series of systems bas ed on hydrogen and carbon dioxide were determined with this correlatio n. The parameters of the equation were determined for 35 binary gas sy stems for which there are no published information on the diffusion co efficient or the information is restricted by the value of the diffusi on coefficient at 273 K alone.