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4 EXPERIMENTS AND MODEL VALIDATION This chapter starts with a brief review of the prior feasibility analyses of using microchannels for gas separation applications, followed by a discussion of an experimental investigation of gas separation in microchannels. The experimental approach, test procedure and observed trends are discussed. Laboratory scale models are developed to replicate the experimental procedure, followed by heat and mass transfer model validation using the observed data. Finally, findings from the experiments are used to improve designs of adsorption systems. 4.1 Introduction Adsorption-based gas separation processes utilized for natural gas purification and carbon dioxide capture from flue gas have been shown to benefit from the use of adsorbent-coated microchannels, which yields a greater process capacity, and competitive product purities and gas recoveries when compared with other conventionally used geometries, as discussed in Chapters 2 and 3. Due to high heat and mass transfer coefficients in microchannels, the execution of the various stages of the adsorption-based gas separation cycle is faster than that of adsorbent beds, and a sharp wave front is maintained for the adsorption and regeneration stages of the cycle. Pressure swing adsorption (PSA) in microchannels is found to be effective because of unimpeded transmission of pressure waves along its length. In a PSA process, the depressurization in microchannels is found very effective when the stage performance is compared with the fixed bed depressurization processes in the literature. Pahinkar et al. 98PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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