Abstract
Abstract To determine the rate-controlling step in an industrial separation adsorber, the distribution of macropore and zeolite crystal resistances to the mass transfer over the column height during an adsorption-desorption cycle for a binary system is demonstrated and calculated on the basis of a mathematical adsorber model. The time-space behaviour of resistances is found to be essentially dependent on adsorption thermodynamics and loading of displacement gas. For the demonstration example, the zeolite crystal resistance has the dominant role especially for deteriorated molecular sieve. It is shown that with increasing times on stream the drop in equilibrium parameters and micropore diffusivity (including the crystallite surface barrier) are mainly responsible for the increase in zeolite crystal resistance as well as for the loss of output and separation efficiency.
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