I am trying to model a Benzene recovery process by extractive distillation in Aspen plus. The calculation type chosen for the radfrac column is 'equilibrium' with the tray efficiency of 75%. i could obtain the desired results. I tried to change the tray efficieny to 30%, but there was no significant change in the overall results. Why is it so? Can someone please explain me why the effect of changing tray efficiency was not observed in the recovery of Benzene?
How many trays do you have in your simulation? Are you seeing an azeotrope on several of the trays? If so is the composition the same for a large part of the column because of the azeotrope?
Syntax errors are another common problem. You may not be specifying the column the way you think.
More details might help. Unfortunately I haven't used Aspen in a very long time. If the problem is similar to other simulators I might be able to help a little.
Rick Manner I have 65 trays. Although I am seeing azeotrope on some trays, same composition does not prevail for large part of the column. I have given condensor outlet temperature and bottoms flow rate of column as input conditions. Is it possible that these input conditions are suppressing the murphree efficiency input?
Changing tray efficiency has essentially the same impact as changing the number of theoretical trays. You can draw more of the azeotropic product and the composition of the other product will adjust to maintain material balance.l adjust accordingly to material balance.
Changing tray efficiency has essentially the same impact as changing the number of theoretical trays will have no impact on the product composition once you hit the azeotrope. . You can draw more of the azeotropic product and the composition of the other product will adjust to maintain overall component material balance.
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