The Kinetics of Adsorption of Methane and Nitrogen from Hydrogen Gas
Adsorptive purifiers are fixed-bed units in which the carrier gas containing the impurity to be adsorbed is passed through a packed bed of adsorbent. In this type of operation there are two distinct mass transfer processes: the diffusion of the impurity through the gas phase to the surface of the adsorbent, and diffusion into the particle. If both of these processes were extremely rapid, equilibrium would exist at all points in the adsorbent bed, and a plot of the adsorber outlet concentration as a function of time would be a step function. Usually, however, one or both of the mass transfer processes are relatively slow, with the result that the concentration-time (breakthrough) curve assumes an S shape. The prediction of breakthrough curves is of considerable practical importance, since the determination of the amount of adsorbent that is unsaturated when the first trace of impurity appears at the outlet of the adsorbent bed requires a knowledge of the breakthrough curve for the system under consideration.
KeywordsMass Transfer Coefficient Breakthrough Curve Inlet Concentration Cryogenic Engineer Experimental Breakthrough Curve
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