Measurement of liquid phase counter-diffusion in zeolite crystals by the ZLC method
| Autor: | Peter Stapleton, Douglas M. Ruthven |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Chemistry
Applied Mathematics General Chemical Engineering Continuous stirred-tank reactor Mineralogy Thermodynamics General Chemistry Thermal diffusivity Industrial and Manufacturing Engineering Volumetric flow rate Condensed Matter::Materials Science Adsorption Desorption Gaseous diffusion Diffusion (business) Zeolite |
| Zdroj: | Chemical Engineering Science. 48:89-98 |
| ISSN: | 0009-2509 |
| Popis: | The zero-length column (ZLC) method, originally developed for measuring the diffusion of gases in zeolite crystals, has been extended to the measurement of liquid phase counter-diffusion coefficients. The application of the technique is illustrated by a detailed experimental study of the benzene-n-hexane-13X-zeolite system. Because of the higher molecular density of the liquid phase and the limited sensitivity of liquid phase detectors, the conditions under which reliable diffusivity measurements can be made are quite restricted. In interpreting the desorption curves, it is necessary to account for the time required to purge the interstitial liquid from the adsorbent sample. A simple theoretical model, based on treating the adsorbent sample as a well-mixed CSTR, is developed and shown to provide a good representation of the observed behaviour as well as a useful guidance as to the range of flow rates under which reliable diffusivity measurements are possible. |
| Databáze: | OpenAIRE |
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