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Li94.5Na1.5-X-1.0 and Li94.2Na0.7Ag1.1-X-1.0 sorbents in this work. As can been seen from Table 5, run 1 comprised of a feed pressure of 1.0 atm while run 2 was carried out at a higher feed pressure of 1.2 atm. The cocurrent depressurization pressure, feed velocity and purge velocity were optimized so as to obtain the same product purity and recovery for both the sorbents. As seen from the O2 and N2 isotherms in Figure 8, the Li94.2Na0.7Ag1.1-X-1.0 sorbent has a higher capacity for N2. From the extended Langmuir isotherm (eq. 9), it follows that the higher N2 loading further suppresses the O2 loading under mixture conditions, and as a result the working capacity of the Li94.2Na0.7Ag1.1-X- 1.0 sorbent further increases. Hence the amount of bed utilization (or the depth of propagation of the N2 wavefront in the bed) of the Li94.2Na0.7Ag1.1-X-1.0 sorbent was lower than that of the Li94.5Na1.5-X-1.0 sorbent under identical cycle conditions. The higher capacity of the Li94.2Na0.7Ag1.1-X-1.0 sorbent could be exploited by employing higher feed throughputs and lower cocurrent depressurization pressure without significantly lowering product purity and recovery. An obvious outcome of the higher capacity of the Li94.2Na0.7Ag1.1-X-1.0 sorbent was a higher product throughput compared to that of the Li94.5Na1.5-X-1.0 sorbent when the other performance parameters (i.e., product purity and recovery) were kept the same. However, the heats of adsorption of the two components on the Li94.2Na0.7Ag1.1-X-1.0 sorbent were also higher than those on the Li94.5Na1.5-X-1.0 sorbent. Severe temperature rise during adsorption is known to adversely affect PSA separation performance. Hence a PSA simulation run became necessary to critically evaluate the importance of higher N2 loading in case of Li94.2Na0.7Ag1.1-X-1.0 sorbent and the accompanying heat effects. 67PDF Image | PSA USING SUPERIOR ADSORBENTS
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