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6.2. Role of Pressure Drop in Small Scale PSA Pressure drop is a potential process limitation for small scale PSA that is not well understood. Hence, the purpose of first set of PSA experiments is to demonstrate how pressure drop affects small scale PSA performance. Pressure drop across the column was manipulated by changing column dimensions such that the cross sectional area between the columns sets varied by a factor of two while the amount of adsorbent remained constant, as outlined in section 5.5.7. This permitted a comparison between the process performance of two different sets of columns with a column pressure drop per unit column length that varied by a factor of two (or total pressure drop across the column that varied by a factor of four). The results were then compared to simulated cycles to further explain the experimental results. 6.2.1 Experimental Results Pressure drop measurements for the experimental portion of this study were restricted to the constant high pressure production step due to experimental limitations. As expected, the cycles of the longer columns exhibited about twice the pressure drop per centimeter of column length as the cycles of the shorter columns at the same pressure ratio. Column pressure drop during the production step was generally consistent with Ergun equation predictions within 10%. The highest recorded pressure drop during the production step only approached 1 kPa/cm during the fastest cycle of the longer columns (pressure at column exit was 10% less than the inlet). For small scale air separation applications, the column length used in this study is similar to what is used in industry for a POC. 114PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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