Gas adsorption and permeation of CO2 gas weremeasured on two carbon molecular sieve membranes over awide pressure range. The two membrane samples werefabricated under similar conditions but with different degreesof carbonization. The pressure dependence of the permeationtime lag was investigated and it is found that the diffusioncoefficient takes a stronger functional dependence on loadingthan the Darken relation and this dependence increases withthe degree of carbonization
