Register to reply

Distillation column feed preheating

by pradeepbarola
Tags: distillation, preheating, traylocation
Share this thread:
pradeepbarola
#1
Sep11-13, 11:16 PM
P: 7
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.
Attached Thumbnails
Preheater.jpg  
Phys.Org News Partner Engineering news on Phys.org
Printing the metals of the future
New gadget helps the vision-impaired to read graphs
3D printing helps designers build a better brick

Register to reply

Related Discussions
Feed-Forward vs Feed-Back Electrical Engineering 2
Help with distillation column design Materials & Chemical Engineering 0
Vacuum Distillation Column Materials & Chemical Engineering 0
Fractional Distillation and Normal distillation Biology, Chemistry & Other Homework 1
In general, what is the best type of column used for fractional distillation? Chemistry 1