Sorption of organic vapors under static conditions

SORPTION OF ORGANIC VAPORS UNDER STATIC CONDITIONS 

For organic solvent vapors the type of isotherms describing sorption onto the hypercrosslinked sorbent Styrosorb 2 strongly depends on the nature of the sorbate molecules (Fig. 10.5) [6, 7]. Hydrocarbons exhibit a reasonable affinity to the adsorbent and are characterized by a convex initial part of the isotherms and a general shape typical of mesoporous 

Note that the ultimate amount of organic solvent vapors adsorbed by Styrosorb 2 is several times larger than the total pore volume of the dry sorbent (0.22cm /g), implying strong swelling of the sorbent during 

Sorbate Molar volume of solvent (cm /mol) Ultimate sorption at p/Ps 1 (mmol/g) Volume of adsorbed solvent (cmVg) 

The cooperative structural rearrangement of the network associated with the continuous swelling of the hypercrosslinked sorbent with all the examined organic vapors is indicated by the hysteresis loops always extending throughout the entire range of relative pressures, down to zero (Fig. 10.7). This basically differs from the hysteresis loops caused by capillary condensation in the mesopores of adsorbents with rigid structure in the latter case, the loop closes toward low vapor pressures. 

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