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Impact Of Dry Trays On Distillation Tower

relfux dry trays

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#1 NoobMi


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Posted 10 January 2020 - 10:38 PM

Hi all,


I have a question on the operations of a minimum reflux ratio in distillation column.

Currently i have a 10 tray tower with inlet feed at the 5th tray.


1st question:

If i were to fully reduced the reflux ratio to 0, does it means that my effective distillation trays will only become 5 trays?

Also what will happen if dry trays were to occur? Will it have higher chances of fouling / mechanical failure, etc?


Or is there any minimum reflux ratio / wetting volume required in tray towers?

#2 Bobby Strain

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Posted 11 January 2020 - 12:27 AM

Your query makes no sense at all. Why would you consider such an operation?



#3 PhilippM


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Posted 11 January 2020 - 05:57 AM

The "dry trays" would simply not be involved in any separation process and are therefore completely useless. Instead you would just design the tower with 5 trays and have the feed at the top. Every tray needs both a vapor and liquid phase in order to work at all, and most process simulators will not converge otherwise, so you either need the feed at the top or a reflux. Maybe you should provide a sketch in order to explain what you want to achieve.

#4 breizh


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Posted 12 January 2020 - 08:16 AM

Hi NoobMi ,

Like others I 've difficulty to understand your query . Are you a chemical engineer ?

Are your questions related to particular steps in your operation , let say start up for example ?


I've attached links where you can find information about Separation  processes , Rmin in distillation process , etc 





Good luck


Attached Files

Edited by breizh, 12 January 2020 - 08:35 AM.

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