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Figures 6.12 and 6.13 once again illustrate how the gas phase composition varies over the column length at the end of the production and purge steps. After the production step, there is a noticeable difference in the profiles as the faster cycle exhibits a greater amount of MTZ spreading. This is at least partially responsible for the reduction in recovery with increasing cycle speed. After the purge step, Figure 6.13 illustrates the concentration profiles have nearly the same shape. Although there is a noticeable vertical shift between the profiles, there is no apparent impact on the solid loading profile after the purge step as indicated by Figure 6.14. As with the previous comparison, the P/F ratio was held constant for the two cycles, thus the amount of purge gas used was again about the same. The columns achieving nearly identical loading profiles after the purge step seems to contrast the previous simulation comparison. However, Figure 6.14 also shows less nitrogen was adsorbed at the end of the production step for the faster cycle, which means less desorption is required to achieve the same loading profile after the purge step. Thus, even though the purge step of the faster cycle is less efficient due to column pressure drop, the loading profiles after the purge step remain similar. The reduction in nitrogen loading during the production step is likely the result of a combination of mass and heat transfer resistances. At the feed end of the column where most of the adsorption/desorption occurs, the difference in working capacity is caused by a resistance to heat transfer. At the product end of the column, the difference in loading is the result of a resistance to mass transfer. In the middle of the column, it is a combination of both resistances. 123PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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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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