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improve the estimation of the integral in equation 5.1. While the nitrogen component of n* and n may be found from an equilibrium model and experimental data, the number of points in the MTZ becomes limited as gas velocity increases. The simulated curve increases the amount of points in the MTZ to improve the accuracy of the integration. Furthermore, since the experiments were run near adiabatic conditions, thermal effects are better described through use of the model rather than attempting to measure them experimentally. An example of a typical breakthrough curve along with the model representation of the curve is presented in Figure 5.4. Since the model is non-isothermal, it is able to reasonably represent the experimental curve and account for the shift in equilibrium due to the temperature increase. The predicted rise in temperature in the outlet stream ranges from 20 °C at the lower gas velocity experiments to 23 °C at the higher gas velocity experiments. Both n and n* were calculated from the exit molar flow rate, pressure, and temperature of the model. The variable n was found from a differential balance of the adsorbate as described by Wu et al.32 and in Appendix B. The variable n* was determined from gas properties at the simulated column exit conditions at time t. 76PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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