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pure product. The second reason is that at low pressure, the density of the product used to purge the bed is less. Again, this implies that less pure product is needed to purge the bed. 4. The final step is pressurization of the adsorbent bed, during which the pressure in the bed is increased from PL to PH. The cycle we are studying uses pure product gas from the second bed. A t the end of this step the bed has returned to its initial condition. In Figure 3.2, the heavy line represents the leading edge of the concentration wavefront, and the shaded portion represents the length of the bed containing the more adsorbed component. Initially, the bed is free of species A , and during the feed step the species A molecules progress to the end of the bed. During blowdown, only the feed end is open, so the velocity at the product end is zero; hence species A remains throughout the bed. During the purge step, the species A molecules are displaced from the bed by the species B molecules. There are no species A molecules in the bed during the pressurization step. 41PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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