Distillation column feed preheating

  • #1
Refer to the attached drawing for more details .

In this distillation column acetone is to be separated from a mixed feed coming at ambient temperature. It is a packed column with mellapack packings. Steam is used in the reboiler (thermo syphon) for heating. Details of these streams are
Feed: 600 kg/hr (72% acetone, 17.5% water & 10.5% aniline)
Steam: 600 kg/hr, 3 bar-g
Boiling point of acetone is 56 degC. I want to use the steam condensate coming from the reboiler for preheating the feed upto acetone boiling point(without vaporization).From the calculations it comes out ~203kg/hr of condensate is required and a plate heat exchanger can be used for this.
But since I have 500 kg/hr condensate available, it can be used to vaporize the feed to some extent.
Questions:
1. How do we enter the partially vaporized feed into the column i.e. will any changes be required in the existing piping and pumping system.
2. Location of PHE: should it be kept below reboiler level to avoid flooding of reboiler or 3 barg pressure is sufficient to have continuous flow.
3. Location of feed tray: since the feed is near saturation or vaporized w.r.t acetone, I thing feed tray location can be lowered further(refer pic. y>x) and it might increase the product purity as well.
 

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