Complete a simulation of the entire process for the hydrodealkylation of toluene in Figure 6.14. Initially, let the purge/recycle ratio be 0.25 ; then, vary this ratio and determine its effect on the performance of the process. Use a design specification to determine the unknown amount of hydrogen to be added to the feed stream (equal to that lost in the purge). If using ASPEN PLUS, the distillation columns can be simulated using the RADFRAC module with the number of stages and reflux ratio previously computed by the DSTWU module.

Figure 6.14:-

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H, 549 lb/hr +? 70F, 569 psia 569 psia Q Compressor 120F CW 90F 484 psia 1,150F 494 psia Purge CH4 4,398 lb/hr H ? Flash 100F, 484 psia Fuel CH? H ? CH6 20,989 lb/hr Pump C12H10 423 lb/hr CH 25,262 lb/hr 1,00PF 564 psia 1,20XPF 1,268 F Reactor 404 psia Heat 75F, 569 psia Exchanger AP = 70 psia Furnace AP=0 psia C,H8 8,421 lb/hr Figure 6.14 Flowsheet showing a task integration for the toluene hydrodealkylation process.