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working fluids and HTFs through separate, alternating parallel channels. They found that process capacity was improved over bed-based PSA processes by up to an order of magnitude at similar values of purity and recoveries. Subsequently, by sending the process gases and HTF through the same microchannels, they reduced the system footprint considerably while achieving up to five times greater product capacity compared to the design with separate channels, as seen in Chapter 3. These promising predictions from gas separation process models that use adsorbent-coated microchannels warrant experimental investigations of the heat and mass transfer processes during gas separation and validation of the models with the data. Recently, Lively et al. conducted studies to analyze hollow fiber response during gas separation and rapid temperature swing adsorption processes. Lively et al. (2009) described a spinning technique to fabricate hollow fibers with high adsorbent fraction to improve separation performance and reported its use to separate CO2 from N2 in a flue gas stream. They documented the adsorption capacity and degree of spreading of the breakthrough curve as a function of gas flow rates and module void fractions. They also investigated the effect of cooling water on adsorption stage performance in terms of increase in CO2 adsorption capacity and reduction of CO2 breakthrough velocity. Additionally, an effect of cooling water velocity on the amount of the heat of adsorption that can be captured was analyzed (Lively et al., 2009; Lively et al., 2010; Lively et al., 2011; Lively et al., 2012). Kalyanaraman et al. (2015) compared results from experiments on the adsorption stage using hollow fibers with corresponding model results using different flow rates, hollow fiber lengths, and packing fractions. They used sequential flows of flue gas with 100PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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