Double reflux(DR)pressure swing adsorption(PSA)process has the advantage of not being affected by pressure ratio,and is expected to break through the thermodynamic limitations of traditional pressure swing adsorption(PSA)to obtain two high-purity gases at the same time.In this work,based on the two-bed four-step DR PSA process,we investigated the separation effects of activated carbon(AC),13X and 5A molecular sieve composite adsorbents,and Cu(Ⅰ)/AC single adsorbent,achieving the simultaneous preparation of high-purity H2 and CO products.A non-isothermal adsorption model consisting of mass,momentum and energy balance equations was developed using the Aspen Adsorption simulation platform,and its reliability was verified through fixed-bed adsorption experiments.The results demonstrated that the DR PSA process with AC,13X,and 5A molecular sieve composite adsorbents exhibited unsatisfactory separation efficiency,but exhibited stronger CO desorption ability;using Cu(Ⅰ)/AC alone as the adsorbent can significantly enhance the separation efficiency,that is,using CO/H2=0.5/0.5(volume ratio)synthesis gas as the raw material,H2 product with a purity of＞99.999％could be obtained,the CO content is＜0.20 ml/m3,and the yield is 96.69％.At the same time,the purity of CO product attains＞97.00％,and the yield reaches 99.16％.Increasing the reflux ratio of light and heavy components could further improve the purity of H2 and CO product gases,respectively.
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