Handbook of Solvents - George Wypych - ChemTech - Ventech!

22.1 Absorptive solvent recovery 1527
Figure 22.1.12. Pressure drop for various activated carbon types.
Figure 22.1.13. Adsorption isotherm of tetrahydrofuran for several temperatures.
bed also a temperature front follows in the same direction. To deal with the adsorption heat
the inlet solvent concentration is usually limited to about 50 g/m 3 .
The adsorption capacity of the adsorbent increases with pressure because the partial
pressure of the solvent increases. An increase in adsorber temperature causes a reduction in
adsorption capacity. Because the equilibrium capacity is lower at higher temperatures, the
dynamic capacity (working capacity) of the activated carbon adsorber will also be lower. To
enhance adsorption, the inlet temperature of the adsorber should be in the range of 20-40°C.
In Figure 22.1.13 the adsorption isotherms of tetrahydrofuran on activated carbon D43/3 for
several temperatures are shown. 13