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It should be noted that in this study, the “Feed Step” is the combination of the feed pressurization and production steps. A higher P/F ratio means a greater amount of product gas is used in column regeneration, which further pushes back the MTZ towards the feed end of the columns. The minimum P/F ratio is the ratio that gives the desired product purity, but a further decrease in the ratio causes undesired product purity. In order to ensure the desired product purity is maintained, it is not advisable to operate at the minimum P/F ratio, but rather at a ratio slightly higher than the minimum. Pressure ratio is set based on the power allowances for the process. It is defined as: For a PSA process, the blowdown/purge step occurs at atmospheric pressure and a pump is required to pressurize the columns to the desired adsorption pressure during the feed/production steps. For a VSA and combined PVSA processes, the blowdown/purge step occurs at vacuum pressure and the adsorption pressure is either atmospheric pressure for VSA cycles, or some pressure above atmospheric for PVSA cycles. Regardless of cycle type, increasing pressure ratio leads to higher recovery at the cost of additional power consumption. However, the gain in recovery is diminishing as pressure ratio increases; hence pressure ratio is normally chosen near the point where the gain in recovery no longer justifies the required power increase. 90PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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