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4.7 Conclusions Gas separation in adsorbent-coated microchannels is studied experimentally and analytically. For preliminary validation, adsorption experiments are conducted on PLOT columns over a range of imposed ΔP and L. Trace water vapor adsorption is demonstrated to be interfering with dry CO2 adsorption, affecting the repeatability of the adsorption tests. Installation of gas dryers in flow paths results in reliable and uniform adsorption time and ΔT data. Additionally, fluid flow, heat and mass transfer models for the adsorption stage are developed. PLOT column packing properties are inferred from the measured values of adsorption times and temperature rises for the entire range of test matrix. With the properties established, the model predicts adsorption times with an AAD of 14%, ΔT with an AAD of 41%, and ΔTMax with an AAD of 13%. The qualitative agreement between the model results and the data for adsorption times is good, while the differences between predicted and observed ΔTs are attributed to local variation in adsorbent packing, absence of adsorbent particles at some locations, and uneven adsorbent layer thickness. However, the observed ΔTMax data agree closely with the predicted ΔTs. This is because, if the adsorbent packing properties in the models match exactly with those in the experiments at any axial location, the predicted ΔT would match with the observed ΔTMax exactly. Adsorption in customized adsorbent-coated microchannels with known adsorbent layer packing properties and adsorbent mass is also investigated to achieve improved validation. These channels result in greater ΔTs compared to those with the PLOT columns as a result of higher adsorbent volume fraction, which yields greater adsorption capacity. The model predictions for these channels agree very well with the data with an 153PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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