Equilibrium isotherms and kinetic data for sorption of ethylamine on two different H-form ion exchangers (a homogeneous gel type and a biporous MR type) have been determined experimentally by the gravimetric method. The gaseous amine is adsorbed on the dry resins according to an acid-base neutralization reaction, and the saturation capacity coincides with the exchange capacity of the resin. For the gel-type resin, the equilibrium is less favorable and the isotherm is almost linear over the experimental range.
The kinetic data also reflect the structural difference between the two adsorbents. In the MR-type resin, the sorption rate is controlled by macropore diffusion with rapid equilibration of the adsorbed phase within the microparticles. Since the equilibrium isotherm is highly favorable, approaching the irreversible limit, the uptake curves are well represented by the ‘shrinking core’ model. Diffusion in the gel-type resin is much slower and the pore diffusivities are smaller by several orders of magnitude, presumably reflecting the smaller effective pore diameter.
These results suggest that the MR-type resin is a potentially useful adsorbent for removal of traces of light amines from industrial gases.
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