Working conditions determine the efficiency of a pressure swing adsorption (PSA) process employing a given adsorbent. The correlation between working conditions and the performance of a small-scale PSA air separation system was comprehensively and quantitively analyzed by experiments and models. Results showed that product recovery could be improved by decreasing the superficial inlet velocity, and the maximum productivity was achieved under optimal superficial velocity conditions of 0.35–0.6 m·s–1 due to a high product recovery and feed rate. Based on the analysis of the mass flow of the cyclic adsorption process, the product recovery and productivity are related with a simple equation of superficial velocity, and the correlation model is in satisfactory agreement with the experimental results. The quantitative relationships between the superficial velocity and performance can be used for designing the adsorber and adsorption process.

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