STUDIES OF DIFFUSION AND OTHER RATE-PROCESSES BY GAS-CHROMATOGRAPHY

Physicochemical measurements by gas chromatography are reviewed, and t he carrier gas flow-rate perturbation is introduced as the stopped-flo w and the reversed-flow techniques. The general principles of the latt er are presented, and then the latest theoretical developments and app lications for measurement of rate coefficients and distribution consta nts are given. These include gas diffusion coefficients, obstructive f actors and external porosities in solid beds, diffusion coefficients o f gases in liquids,interfacial gas-liquid resistances to mass transfer , and the simultaneous determination of adsorption, desorption and rea ction rate constants of gases on solids.