Abstract
Pressure swing adsorption (PSA) is a well-established gas separation technique in air separation, gas drying, and hydrogen purification separation. Recently, PSA technology has been applied in other areas like methane purification from natural and biogas and has a tremendous potential to expand its utilization. It is known that the adsorbent material employed in a PSA process is extremely important in defining its properties, but it has also been demonstrated that process engineering can improve the performance of PSA units significantly. This paper aims to provide an overview of the fundamentals of PSA process while focusing specifically on different innovative engineering approaches that contributed to continuous improvement of PSA performance.
Highlights
Adsorption is the name of the spontaneous phenomenon of attraction that a molecule from a fluid phase experiences when it is close to the surface of a solid, named adsorbent
When the adsorbent is put in contact with a fluid phase, an equilibrium state is achieved after a certain time
Most works on Pressure swing adsorption (PSA) processes have shown that normally the purity and recovery present a trade-off for the design
Summary
Adsorption is the name of the spontaneous phenomenon of attraction that a molecule from a fluid phase experiences when it is close to the surface of a solid, named adsorbent. The time required to achieve the equilibrium state may be important, when the size of the pores of the adsorbent are close to the size of the molecules to be separated [28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43]. As a rule of thumb, pressure swing adsorption is preferred to other processes when the concentration of the components to be removed is quite important (more than a few per cent). In such conditions, loading the column with. The most important industrial applications of PSA processes will be used to address its technological evolution: air separation and hydrogen purification. The effect of different regeneration protocols and the reduction of the overall cycle time (Rapid Pressure Swing Adsorption) are discussed
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