Adsorption: Science and Technology by K. S. W. Sing (auth.), Alírio E. Rodrigues, M. Douglas

By K. S. W. Sing (auth.), Alírio E. Rodrigues, M. Douglas LeVan, Daniel Tondeur (eds.)

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11. Selectivity 8,. at P = 1 predicted by lAS, HIAS, and MET for single-gas adsorption isotherms in Fig. 9. S MOLE FRACITON NO. lIN GAS PHASE Fig. 12. Total amount adsorbed at P = 1 predicted by lAS, HIAS and MET for singlegas isotherms in Fig. 9. 0} for component 2. Figs. 9--12 compare predictions of binary adsorption by lAS, HIAS, and MET (with exclusion of component 1 from 50% of the area accessible to component 2). Single-gas isotherms are shown on Fig. 9. 8) but molecule 2 is smaller and therefore has a higher saturation capacity.

Torr) 0 and we see that the pre-exponential factor in eqn. 2 is given by: K o = v/e 2 kT (7) where v is the free volume of the subsystem. The free volume of a zeolite cage will be smaller than the actual cage volume since the finite size of the sorbate molecule will restrict the molecule within the central region. A rough estimate may be obtained by taking the free volume as the volume of a sphere of diameter equal to . the actual cage diameter minus the van der Waals diameter of the sorbate molecule.

Tion. Similarly good agreement was found for the system C2 H6 -C 2Hu-13X, which is not surprising since the dat~1~r this system havelDeen shown previously to conform to the lAST model. 49 3 . 0 r - - - - - - - - - - - - - - - - - -_ _ _ _--. 3 KPa) 01 oU ---,. P = 30 Torr (4 KPa) T =458 K Q) ....... Q) ;::) u 20 ~. 0 Mole Fract ion Cyclohexane in Gas Fig. S Binary isotherms for n-heptane-cyclohexane in NaX zeolite showing comparison of experimental data with theqretical curves from eqns 30 and 31 (Reprinted with permission).

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