LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION

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LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION ( limits-small-scale-pressure-swing-adsorption )

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between the cycles diverges. This indicates mass and heat transfer resistances both contribute to the difference in loading in this region. At the product end of the column, the solid temperature of the faster cycle is nearly the same as the slower cycle. Clearly, the difference in loading at this end of the column is primarily due to mass transfer resistances. The simulation results therefore suggest the largest variation in the concentration and loading profiles as cycle speed increases occurs during the production step. This leads to the conclusion that for this study, mass and heat transfer resistances during the production step are critical to the recovery and BSF of the process. It also confirms the experimental results, which suggested column pressure drop was not a significant source of process performance decline as cycling frequency increases. Figure 6.15. Comparison of solid temperature profiles at the end of the production and purge steps 126

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