Material concentration on the simulated tray in a distillation column
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Using ASPEN to simulate the distillation column, the concentration changes very little on the middle plates, increase significantly near the top of the column, and even double on the last two plates, as shown in the figure below. Is this normal?
My feed position is below tray 9# – is the number of trays set too high?
It’s possible; it could also be that the amount of backflow is too small
You can take a look at the vapor and liquid flow rates on each tray to see if there are any significant differences
You can try increasing the reflux rate or lowering the temperature at the bottom of the tower