1986 Volume 12 Issue 6 Pages 640-646
Bicomponent Adsorption of carbon dioxide and ethylene contained in an inert nitrogen stream by a fixed bed of synthetic zeolite 4A was studied.
The adsorption equilibrium obtained for the single component carbon dioxide was correlated well by a Langmuir-Freundlich-type equation rather than the Langmuir equation, while the equilibrium data for ethylene were expressed well by the Langmuir equation. The extended Langmuir-Freundlich-type equation was modified on the basis of a concept that synthetic zeolite 4A has two kinds of adsorption sites, and was further modified empirically to account for interactions between the two adsorptive components. The adsorption equilibrium data obtained for the bicomponent system were correlated well by this modified, extended Langmuir-Freundlich-type equation. Fixed bed breakthrough curves were simulated by use of the equation along with the so-called linear-driving-force approximation for the intraparticle diffusion equations. The breakthrough curves calculated for both adsorbates agreed well with those measured under various operating conditions.
