Roll-up effects

The displacement train is a result of the roll-up effect that takes place when species interfere. Although displacement chromatography produces very pure and concentrated products, it has some severe disadvantages. One drawback is that the bands in the isotachic train are very narrow, which makes the harvest of the pure products a non-trivial task. A second drawback is the need to introduce an additional, strongly adsorbing species, which is undesirable as it is hard to remove from the resin. 

FIGURE 11.13. Theoretical profiles of concentration (c) and temperature (T) during thermal regeneration of an adiabatic natural gas drier showing roll-up" effect leading to eondensation in... 

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