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3.1 Introduction 3 PERFORMANCE ASSESSMENT In Chapter 2, a temperature swing adsorption (TSA) process in adsorbent-coated microchannels for natural gas purification, with the flow of working and coupling fluids through the same microchannels, was investigated. A review of existing industrial natural gas purification techniques was conducted to identify the advantages and limitations of MEA absorption (Göttlicher and Pruschek, 1997; Aaron and Tsouris, 2005; Yang et al., 2008; Pirngruber et al., 2013), membrane separation (Koros and Mahajan, 2000; Baker, 2002; Bernardo et al., 2009) and bed-based PSA systems (Cen et al., 1985; Kapoor and Yang, 1989; Olajossy et al., 2003; Liu et al., 2011; Shao et al., 2011; Mulgundmath et al., 2012), which are extensively investigated and used for commercial gas separation plants. TSA-based purification processes, however, are difficult to implement (Riemer et al., 1994) due to the low thermal conductivity of the adsorbent packed in an adsorbent bed, except for the recent studies with microchannel heat and mass exchangers (Lively et al., 2009; Determan et al., 2011). It was also demonstrated that with the recent developments in manufacturing of hollow fiber or mixed matrix membranes (MMM), adsorption-based gas separation systems can be designed to effectively utilize high heat and mass transfer coefficients in microchannels to enhance product collection and reduce system footprint (Pahinkar et al., 2015, 2016). In Chapter 2, adsorption, desorption, cooling and purge stages of the TSA-based cycle were analyzed in detail and the microchannel geometry was optimized. The 68PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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