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Despite the previous evidence that suggests the void volume effect is negligible, a brief study on the effect of void volume in our system was first performed for the experimental system. Correcting for external void volume effects usually involves using a zero void bypass column to estimate the effect of the external void volume on the response to breakthrough. This response is then subtracted from the breakthrough curve when the adsorbent material is used. A different and simpler procedure was used just to show that external volume effects in our system were negligible. In our experimental setup, we have the ability to move the mass spectrometer closer to the exit of the column, effectively eliminating half of the external void volume. This prevents us from using the exit flow meter, however, it does allow us to compare the composition response under the same conditions using two different external void volumes. Two different gas velocities are highlighted to illustrate how the void volume effects change with velocity. The lower velocity example (Figure B4) shows the void volume has a very slight effect on the breakthrough response, but that this difference is not detectable at the higher velocity example in Figure B5. As previously mentioned, void volume effects should affect lower gas velocity experiments more, so this was not a surprising result. Considering all of the experiments in this study was run at gas velocities near the velocity in Figure B4 or much higher, it is reasonable to assume that the void volume affects are negligible for these experiments. 164PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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