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Figure 9 (a) shows the CO2 breakthrough curves for sample C5400. The time to reach 50 % of the final concentration occurred after ca. 76, 35, or 21 s at flow rates of 0.2, 0.5, and 1 l/min, respectively. The sharp breakthrough fronts indicate that the flow pattern is close to ideal (virtually no axial dispersion) and that the resistance to mass transfer in the film is very low. Figure 9 (b) shows the CO2 breakthrough curves for sample C5900. The time to reach 50 % of the final concentration occurred after ca. 152, 82, or 62 s at flow rates of 0.2, 0.5, and 1 l/min, respectively. The time to reach 50% of the final concentration for sample C5900 is 2-3 times longer than that for sample C5400, as a result of the higher zeolite loading (1.8 times) per column volume for the former sample. The breakthrough front of sample C5900 is much broader than for sample C5400 however, which is an indication of higher resistance to mass transfer or other features which contribute to dispersion (maldistribution etc.) in the adsorbent. As pointed out above, 0.01-1 m pores, likely open grain boundaries and cracks, were detected by MIP in the film in sample C5400 but not in sample C5900. These pores may contribute to mass transfer in the film in sample C5400, resulting in sharper breakthrough fronts. Figure 9 (c) shows the CO2 breakthrough curves measured for NaX beads. The time to reach 50 % of the final concentration occurred after ca. 630, 1390, or 2780 s for a flow rate of 0.2, 0.5, and 1 l/min, respectively. The time to reach 50% of the final concentration for the NaX beads is about 10 or 30 times longer than that for sample C5900 or C5400, respectively, as a result of the higher zeolite loading (ca. 30 or 54 times) per column volume for the former sample. The breakthrough front of NaX beads is broader than C5400 or C5900 and is an indication of higher resistance to mass transfer due to the long diffusion path (radius of the beads). It is worth discussing the impact of axial dispersion on the breakthrough data. The calculated Re numbers for flow in the channels of the structured supports are 4.4 (400 cpsi) 123PDF Image | Structured Zeolite Adsorbents for PSA Applications
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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