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Home > Forums > Chemical Engineers > Activities > Chemical process engineering Forum

distillation trays(2)

Read More Threads Like This One

jesselai23 (Chemical)

4 May 11 0:37

When the number of tray for distillation column is determined in hysys design(e.g., 5), how many additional trays are added in the actual plant (5+2)?

maddocks (Petroleum)

4 May 11 16:52

wow, this is a huge question. You need to get a copy of Kister's Distillation book and scour the sections on tray efficiency, performance and on and on.

Depending on what the column is doing, you may need as much a 3X as many trays as you've estimated. Start by googling tray efficiency and then keep going. Read papers from the Distillation Group - there's a ton of info out there. Check GPSA, call a vendor, even better, try modelling the same tower to check actual efficiency.

Latexman (Chemical)

4 May 11 21:31

What components are in the system? Pressure? What type trays? Is this for Unit Ops class or lab?

Good luck,
Latexman

(2) sheiko (Chemical)

4 May 11 22:42

What are you trying to do? designing a new column? troubleshooting or modelling an existing one? Is it a classroom exercise?

"We don't believe things because they are true, things are true because we believe them."

sheiko (Chemical)

4 May 11 22:45

In any case, I would rely on Hysys outputs - but only at conceptual stage of the project. I would never establish my proposed design based on the results from Hysys/Tray sizing, or on any other commercially available tool.
For designing/revamping distillation columns, one needs to go to proper address: tray/packing vendors, such as Sulzer, Koch-Glitsch, ACS, etc.

"We don't believe things because they are true, things are true because we believe them."

jesselai23 (Chemical)

5 May 11 0:49

Thanks. Now I got ideas.

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