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In this case, the inclusion of traces when adsorbing in Mg-MOF-74 reduces all parameters, and therefore the recovery is not encouraging. Lastly, for zeolite 13X, the selected point is to desorb at 0.6bar, 413K, and with SO2 traces. The working capacity, specific energy consumption, purity and recovery obtained are 2.5 kmol/m3, 0.46 GJ/tonne-CO2, 92% and 82% respectively, with changes in -19%, +17%, +10% and +4% in all four parameters. To compare this “optima” conditions with the ones obtained for regular PSA/VSA/TSA processes in the previous section, Figure 10 shows the performance of the best conditions in terms of specific energy consumption (i.e., exergy) and working capacity for the processes achieving CCS specifications. The diameter of the bubble is referred to the purity obtained. It can be seen that higher working capacities with lower energy consumptions are achievable with Mg-MOF-74, while the energy consumption can be lowered by more than 30% with respect to zeolite 13X (and up to 10% including impurities). In addition, the efficiency of the processes were calculated according to Zhao et al.:111,122 the minimum work was obtained by calculating the mixture entropies and the composition that showed the best performance in each material (flue gas conditions: T=313K, P=1bar). Values obtained are as high as 35-40%, obtained specifically for the improved VTSA processes, and even higher than the typical values reported in the literature112 (i.e., between 10 and 30%). 49PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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