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criteria for monitored variables during each stage used for determining the stage times for satisfactory performance of the purification cycle. The adsorption stage is continued until the adsorption wave front reaches the axial midpoint of the microchannel so that, as the HTF stream replaces the feed gas stream at the inlet, the feed gas in the upstream half of the microchannel is adsorbed in the downstream half of the adsorbent layer as the displacement is continued, maximizing product purity and recovery. While the displacement times are calculated based on when the gas-liquid interface reaches the outlet, the desorption stage time depends largely on the magnitude of Tdeso and is discussed in detail in later sections. The cooling stage time is the time required for the HTF to leave the microchannel at 25°C, which is the inlet HTF temperature. The purge stage time is calculated separately as discussed earlier, and the purge stage is simply simulated for the corresponding time with the purified product being recirculated, without explicitly modeling the HTF leaving the adsorbent layer. Table 2.2. Purification cycle simulation criteria and monitored variables. Stage Adsorption Displacement of gas Desorption Cooling Displacement of liquid Purge Monitored variable and imposed constraint CA,CO2 = CA,CO2,Max for z ~ 0.5 zIF ≤ L Depends on Tdeso Tg,L = 25°C zIF ≤ L MHTF=0 2.2.7 Microchannel boundary and initial conditions The microchannel inlet is exposed to different species and temperature boundary conditions during the execution of each stage. Table 2.3 lists the boundary conditions at the channel inlet and outlet. The adsorbent microchannel is assumed to be filled with purified CH4 at T0 at the start of the process. The mixing header models are not integrated 39PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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