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The nitrogen solid loading profiles (Figure 6.11) at the high pressure production step and low pressure purge step indicate only slight differences between the two cycles. The variation in loading at the end of the production step is primarily related to heat transfer due to the difference in column diameter. For the low pressure purge step, the difference in nitrogen loading at the feed end (z = 0) of the column is also adequately explained by thermal effects. However, the difference in nitrogen loading at the product end of the column is best explained by pressure drop effects since the loading of the longer columns is greater than the shorter columns in this section. The difference due to pressure drop is not significant and its impact is reduced because it affects the side of the column undergoing the least amount of nitrogen loading/unloading. The solid nitrogen working capacity was determined from the difference in solid nitrogen loading at the end of the production and purge steps. In Figure 6.11, this amounts to the difference of the area under the curves between the production and purge steps. Both columns had an average working capacity around 0.495 mol/kg. If thermal effects were not as considerable, the working capacity of the longer column would be less than the shorter columns due to pressure drop. However, this difference would be relatively small since the overall pressure drop across the column is not significant. Since the P/F ratio was maintained between the two cycles, the amount of gas used during the purge step was nearly the same. As previously mentioned, the loading profile after the purge step does indicate pressure drop reduces the amount of nitrogen desorbed on the product end of the longer columns. A greater amount of gas would be needed to achieve a similar desorption duty as the shorter columns. However, even though the pressure drop per unit length increased by a factor of two (total pressure drop 120PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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