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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CHAPTER III THEORY This section introduces the theory and concepts behind gas adsorption on a surface through a brief discussion of intermolecular forces. Using these concepts, the interaction of oxygen and nitrogen molecules with zeolites is then explained with consideration for how different exchangeable cations affect selectivity. Finally, isotherm models are reviewed along with the column dynamics that occur within a PSA process. 3.1 Intermolecular Forces Intermolecular forces were briefly discussed in the previous section. However, a more rigorous description of these forces is required to understand zeolite selectivity. In a PSA process for air separation, interaction of oxygen and nitrogen molecules with a zeolite is dependent on electrostatic, induction, and dispersion forces. These forces are reviewed to the extent necessary to understand air separation. Additional resources are available that specifically discuss intermolecular forces in greater detail.17, 18 30

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