Page 129 - Process simulation and control using Aspen

ASPEN PLUS SIMULATION OF DISTILLATION MODELS 119

FIGURE 3.18
Under Column specifications option, here we enter the number of stages that is 30.
It is fairly true that we can alternatively specify the reflux ratio when the number of
stages is asked to compute. Note that ethylene is the light key and naturally ethane is
the heavy key. As mentioned in the problem statement, recovery of the light key
component in the distillate (= moles of light key in the distillate/moles of light key in
the feed) is 0.996 and recovery of the heavy key component in the distillate (= moles of
heavy key in the distillate/moles of heavy key in the feed) is 0.001. In addition, the
pressure of the total condenser and reboiler is given as 300 psia. Entering all these
information, one obtains the result, shown in Figure 3.19.

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i f -l-l ft' ,, 1 - I

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-o -

FIGURE 3.19

CopynghlGd material