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Figure 2.2 – The sequence of steps in the basic Skarstrom PSA cycle adapted from Pressure Swing Adsorption [10] Pressure Swing Adsorption for Hydrogen Purification Since the establishment of the Skarstrom cycle (Figure 2.2) in 1957 many innovations have been introduced in the PSA process, as well as, new elementary steps. One of the first improvements was the introduction of the concurrent depressurization elementary step (Avery and Lee, 1962; Cassidy and Holmes, 1984). This was an important progress given that it increases the concentration of the strongly adsorbed components just before the countercurrent blowdown, while the outlet stream consists in pure light product [20]. Afterwards, in 1966 Berlin introduced another step, the equalization step [21]. This step is extremely important since it allows energy savings and enables an increase in the recovery of the weakly adsorbed species [22]. 2.6 Temperature Swing Adsorption and Vacuum Swing Adsorption Other modus operandi can be applied to the Adsorption process. Instead of using the variation of pressure (as used in PSA) the variation of temperature can be used instead. In a Temperature Swing Adsorption (TSA) process desorption step is carried with the increase of temperature. Due to the fact that adsorption is an exothermic process the increase of temperature will favour the desorption step [23]. In processes where the concentration is low and the adsorption step takes longer, Temperature Swing Adsorption is useful [24]. Contextualization and state of art 6PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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