Energy Efficiency of Gas Separation Pressure Swing Adsorption

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Energy Efficiency of Gas Separation Pressure Swing Adsorption ( energy-efficiency-gas-separation-pressure-swing-adsorption )

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From the isotherm, one can determine the ability of a specific adsorbent to separate two gases. This ability can be divided into two main factors: the amount of heavy component adsorbed relative to the amount of light component adsorbed (selectivity), and the absolute amount of each component adsorbed (capacity). The larger the selectivity, the more effective the adsorbent is at separating the gases. The absolute amount of each component adsorbed affects the separation process in a different way. A n adsorbent capable of adsorbing more gas will be more "productive"; it will generate more product per volume adsorbent per unit time. Many equations have been developed to fit isotherm curves. For this work we use the simplest model, linear isotherms, in which the amount of heavy component adsorbed is: A (2.26) AART Where: nA = moles of species A adsorbed per unit adsorbent volume {mol/ m3} kA= isotherm slope for species A {-} PA = partial pressure of species A in the gas phase {Pa} The isotherm for the less adsorbed species is defined similarly: BBRT Due to the difference between kAand kB, the composition of the adsorbed gas (which exists as a mixture on the adsorbent) is different from the composition of the gas =k 21

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