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to 0.925 kmol/s. The reflux ratios and reflux flowrates remain high until the feed composition drops to about 30/50/20 mol%, at which point the required RR and R drop back to their original levels.

Figure 6.18 gives the composition and temperature profiles of the two steady states. Both have the same feed composition: 33/47/20 mol% MeAc/MeOH/H2O. Both have the same impurities in the two product streams. But they have different composition and temperature profiles, and they have greatly different reflux ratios and reflux flowrates.

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