Diffusion coefficients were measured for the C1 to C5 normal paraffins in silicalite using a molecular sieve membrane. The coefficients were measured at 334K and were found to be 1.07 x 10−6cm2/s for methane, 2.2 x 10−7cm2/s for ethane, 7.3 x 10−8cm2/s for propane and 2.42 x 10−8cm2/s for n-pentane. For each of the gases tested, the diffusion coefficients were found to be independent of diffusant concentration over the concentration range tested. The values of the diffusion coefficients were found to correlate directly with the carbon number of the diffusant.

Diffusion of C1 to C5 Normal Paraffins in Silicalite. D.T.Hayhurst, A.R.Paravar: Zeolites, 1988, 8[1], 27-9