6533b832fe1ef96bd129ac38

RESEARCH PRODUCT

Adsorption of p-Xylene/m-Xylene Gas Mixtures on BaY and NaY Zeolites. Coadsorption Equilibria and Selectivities

subject

description

Coadsorption of the gases p-xylene and m-xylene on BaY and NaY was studied at 150 °C in the range of pressure 10-2-3 hPa. For BaY coadsorption isotherms and single-component adsorption isotherms are perfectly superimposed in the whole range of investigated pressure. The capacity of adsorption of BaY is 3 molecules α-1 for each single component as well as for each mixture under 3 hPa. For NaY coadsorption isotherms lie between those of single p-xylene and m-xylene. The capacity of adsorption of NaY for mixtures is in proportion to the composition of the initial adsorptive mixture and varies from the capacity of adsorption for single p-xylene (3.3 molecules α-1) to that for single m-xylene (3.6 molecules α-1) under 3 hPa. The selectivity of the Y zeolite depends on the filling, the composition of the mixture, and the exchangeable cation. Two selective adsorption processes are discerned according to the filling of α-cages. For filling lower than 2 molecules α-1, BaY and NaY exhibit the same behavior toward t...