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The use of adsorbent-coated microchannels simplifies the header and system design due to the use of only one set of microchannels for fabricating a monolith, in a scalable manner, based on design duty. In cross flow arrangements, the number of parallel channels and baffling arrangements used (if any) affects the gas-side pressure drop and heat transfer, while in a microchannel monolith, the performance parameters scale directly with the number of channels in a simple manner. This Chapter investigates the heat and mass transfer response in the adsorbent layer of a microchannel during batch adsorption (breakthrough) tests under a range of imposed pressure drops (or mass flow rates) and microchannel lengths, which are used to validate the corresponding coupled fluid flow, heat transfer, and mass transfer models. 4.2 Experimental set-up and procedure The experimental facility constructed for these experiments on the adsorbent- coated microchannels is shown in Figure 4.1. The microchannel is laid out between two fiberglass insulation sheets in a serpentine fashion. This arrangement helps to vary the microchannel length without major modifications in the test set-up. For the first phase of the experiments, PLOT capillary gas chromatograph (GC) columns from Sigma-Aldrich with a 530 μm internal diameter and an average adsorbent layer thickness of 30 μm are used. Zeolite 5A is selected as the adsorbent because of its high affinity and adsorption capacity for CO2 at near-ambient pressure, leading to a definite capacity gain for CO2 over other gases in the mixture. The microchannel is made of 60 μm thick fused silica, which provides support to the coated adsorbent layer on the inner circumference of the microchannel. 102PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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