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Most breakthrough experiments in literature are performed by an adsorbable component displacing helium. Two reasons are usually cited for this choice: 1) the resulting data can be integrated to determine equilibrium information (as a point on an isotherm). Since we measured pure and binary equilibrium data for N2/O2 in a separate volumetric instrument, there was no need to measure equilibrium data with this apparatus; 2) From a kinetics stand point, which is the main reason for performing breakthrough experiments, helium is so small and light that it offers little resistance to N2 diffusion in the pores, hence a “true” nitrogen mobility is measured experimentally. From a purely scientific point of view, this is correct; however we are trying to generate correlations for engineering use in process simulators where N2 is displacing O2. If a process model is going to use only one MTC for N2 (irrespective of what the other component is), experiments to determine the MTC should be closer to reality, which requires N2 to displace O2. A similar procedure was used in a previous study on extruded mordenite pellets.70 Using O2 as the initial condition has an additional advantage of limiting the inevitable temperature increase in the column during breakthrough experiments. This is simply because of the heat removed through the desorption of O2. 5.4.3 Constant Pattern Breakthrough analysis in this dissertation relies on the assumption of a constant pattern forming in the column during the experiment. A constant pattern forms for any favorable system, such as the one in this dissertation (N2-LiLSX). More detail on why this occurs is provided in section 3.3.3. A constant pattern arises when the concentration profile in the MTZ does not change as the MTZ travels through the column. It typically develops a short length into the column, sometimes referred to as the “entrance length”. 73PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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