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CHAPTER VI RESULTS AND DISCUSSION This chapter first presents the MTCs found from breakthrough experiments and demonstrates that axial dispersion is much more important for small particles compared to large particles. It next experimentally demonstrates how pressure drop affects small scale PSA performance with support from a brief simulation study. Finally, a minimum BSF was measured and an explanation for why it is occurring is explored. 6.1 Axial Dispersion Effects in Small Scale PSA To demonstrate the significance of axial dispersion in columns of small particles, an experimental study was performed to measure the overall MTC as a function of gas velocity at constant pressure and temperature. The experiments were conducted according to the procedure outlined in section 5.4.2. The data is evaluated with the linear addition approximation (equation 4.1) to provide a suitable method to combine the effects of axial dispersion and particle mass transfer resistance, as computationally done for Figure 4.2. The measured breakthrough curves were also converted to MTZ length data 103PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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