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Chapter 2. Pressure Swing Adsorption Processes taining the desired pure component leaves the other end of column at prod- uct pressure, which is only slightly less than the inlet pressure. During this stage the impurities get adsorbed on the solid adsorbent, and the weakly adsorbed component comes out as a product. The time length of this step is very important as the impurity front keeps moving ahead from the feed end during this process step. If it advances too much towards the product end, then later on during the co-current depressurization steps, where the system pressure is decreasing and desorption happens as well, the impurities can breakthrough the column with the leaving product, bringing down its performance. 2. Adsorption with feed and product pressurization: At the start of this stage a side stream from the main product is taken out and is used to pressurize another bed undergoing re-pressurization with product step (step 10). 3. First co-current depressurization: During this stage the inlet flow to the bed is stopped and the outlet valve is opened to another bed undergoing second counter-current pressure equal- ization (step 9). As the pressure in the column reduces, the outlet stream containing pure product leaves the column and pressurizes other column. This efficient usage of the pure product gas left in the bed void space to pressurize other columns greatly improves the overall product recovery, as this not only minimizes the product losses during the counter-current de- pressurization stage but also reduces the system dependency on external sources for bed pressurization. 4. Second co-current depressurization: 39PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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