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Diffusion-coefficients of normal-heptane in a particle of molecular-sieve nay

D. Bobok, M. Ondrejková, and E. Kossaczký

Department of Chemical Engineering, Faculty of Chemical Technology, Slovak Technical University, CS-81237 Bratislava


Abstract: The results of chromatographic measurements of n-heptane diffusion in particles of molecular sieve NaY obtained by the use of nitrogen as carrier gas have been matched by means of two models. The values of effective diffusion coefficients determined at 200—270 °C by means of the model with quasi-homogeneous structure of particles of molecular sieve NaY are 9.83 x 10-10  -2.12 x 10-9 m2s-1 The activation energy of diffusion is 23.6 kJ mol-1. On the other hand, it has been found by using the model with biporous structure of adsorbent particles that the values of Da/r20 for the diffusion in crystals of molecular sieve are 37.03—53.58 s-1 .

Full paper in Portable Document Format: 433a345.pdf


Chemical Papers 43 (3) 345–361 (1989)

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