Figure 4. Profile evolution during two-component uptake estimated from the two-component isotherms.

(a) Ethane (the ‘slow component') during two-component uptake in a mixture with CO₂ (situation of Fig. 2), b shows ethane (the ‘fast component') during ethane uptake after propene presorption over 7 h (situation of Fig. 3). Thick lines are numerical solutions of Fick's second law with the concentration-dependent diffusivities as predicted by equations (4) and (5). Dashed lines show the experimental data of Fig. 2a) and Fig. 3b).