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H2 H2 5.3 Case Studies and Computational Results (t) = 0.67 (t) = 1 (t) = 0 (t) = 0.63 CoB CnB (t)=1 Feed Adsorption at feed pressure with heavy reflux (Step 1) Light reflux at vacuum (Step 5) CO2 Vacuum desorption (Step 2) 0.047 ≤ tnormalized ≤ 0.15 (t) = 1 (t) = 1 Total reflux (Step 4) (Step 8) 0.35 ≤ tnormalized ≤ 1 0 ≤ tnormalized ≤ 0.047 H2 (t) = 0 (t) = 1 Heavy reflux at high pressure (Step 6) CoB CnB CoB CnB Heavy reflux at high pressure (Step 3) 0.15 ≤ tnormalized ≤ 0.35 (t) as profile Feed Atmospheric desorption (Step 7) Figure 5.2: Optimal VSA configuration for case I CoB (step 1) and a light reflux step at vacuum for CnB (step 5). After this, α(t) drops to around 0.63 while both β(t) and φ(t) drop to zero. CnB continues to operate at vacuum while the pressure in CoB rises to around 820 kPa. Thus, with no feed and around 63% bottom reflux, we have a high pressure heavy reflux step for CoB (step 2) with H2 collection at the light end, and, with no top reflux, we have a vacuum desorption step for CnB (step 6) in which a part of the desorbed CO2 is collected, while the rest is sent as a heavy reflux to further enrich its solid-phase concentration towards the heavy end of CoB. Next, α(t) goes to 1 while β(t) and φ(t) remain at zero. The pressure further rises to 900 kPa in CoB while the vacuum Chapter 5. Superstructure Case Study: Pre-combustion CO2 Capture 80 CoB CnBPDF Image | Design and Operation of Pressure Swing Adsorption Processes
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