LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION

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LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION ( limits-small-scale-pressure-swing-adsorption )

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the adsorbent temperature will vary across the MTZ, which also causes additional spreading. Breakthrough experiments are often used to determine the adsorption rate in an adsorbent. This test involves inducing a step change in the inlet concentration to a packed column and monitoring the column exit concentration over time. Eventually the MTZ “breaks through” and forms a breakthrough curve as it exits the column, illustrated in Figure 3.6. In essence, a breakthrough curve is mirror image of the MTZ in the column. The shaded region between point b and point c represent the unused portion of the column. If mass and heat transfer resistances are small and the isotherm is favorable, the breakthrough curve is steep and a sharp MTZ leads to a small length of unused column. Figure 3.3 Mass transfer zone inside a column. c0 is the inlet concentration, ce is the exit concentration, and L is the column length7 45

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