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(point C) to the microchannel inlet, after which it diffuses into the adsorbent and gets adsorbed. Thermocouple readings for the 10 equidistant axial locations in Figure 4.2(a) show a gradual progression of the CO2 adsorption thermal wave along the microchannel axis. As CO2 is adsorbed in zeolite 5A, the temperature of the fused silica coating rises quickly locally, and then gradually drops due to heat loss to the ambient through the insulation sheets. The temperature rise (ΔT), however, is not uniform at all locations because of local variations in adsorbent mass fraction and adsorbent layer thickness. As an example, the ΔT between points A and B, for the thermocouple located at 2.0 m downstream of the microchannel inlet, is 2.1°C. However, the average ΔT for all thermocouples is 1.8°C, and enables prediction of the overall heat transfer process during adsorption, instead of relying on a single thermocouple to estimate the heat of adsorption. Once CO2 saturates the entire adsorbent layer, it exits the microchannel and is detected by the mass spectrometer. After this time, marked by point D in Figure 4.2(b), further influx of feed gas into the microchannel does not change the concentration. The horizontal distance between points C and D, 12.3 s, indicates the useful adsorption time for the experimental conditions and PLOT column being tested. The results in Figure 4.2 are discussed for illustration of the experimental procedure; however additional PLOT columns are used for a comprehensive set of adsorption experiments, by varying the ΔP and L. The adsorption experiment is repeated to obtain ten readings for each combination of ΔP and L by sequential switching of the solenoid valve as explained previously. 108PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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