Abstract

The diffusive transport of water, methanol, ethanol, butene, benzene and toluene through porous bodies of compacted, microcrystalline zeolite of type NaX has been studied by slow neutron transmission at ambient temperature and pressure. The observed moving profiles of density can be understood in terms of solutions of a nonlinear diffusion equation containing a drift term. The experimental data have been interpreted with diffusivities in the order of magnitude of 10 −10 m 2 s −1 and drift velocities of about 10 −6 m s −1.

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