Four-bed PSA system

Fig. 15. Four-bed PSA system cycle sequence chart (64). EQ, equalization C D A, cocurrent depressurization C D T, countercurrent depressurization R, repressurization A, cocurrent flow T, countercurrent flow. Courtesy of American Institute of Chemical Engineers.

FIGURE 11.25. Schematic diagram of a four-bed PSA system for air separation. (From ref. 35 excerpted by special permission from Chemical Engineering, Oct. 16, 1978, p. 88. Copyright 1978, by McGraw-Hill, Inc., New York, N.Y. 10020.]... 

Figure 7.2 Bed arrangement for H2 recovery in a four-bed PSA system (source Yang, 1987).

There are very few publications which compare simulated H2 PSA process performance using multi-component, non-isothermal models with those obtained experimentally, particularly for production of high purity H2 from SMROG or ROG- like feeds [28- 32]. Figures 10a and b show two examples. The solid and the dashed lines are the simulation results using adiabatic and isothermal columns, respectively. The points are experimental data. The ROG feed was purified using a six bed system packed with a layer of silica gel and a layer of activated carbon [31]. The SMROG feed was purified with a four bed system packed with a layer of an activated carbon and a layer of 5 A zeolite [32]. The cycle steps for both systems were similar to those of the Poly-bed PSA process. 

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