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Deethanizer Column


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#1 abcdssjenfl

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Posted 25 January 2018 - 01:12 AM

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Edited by khayala963003, 25 January 2018 - 02:31 PM.


#2 fallah

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Posted 25 January 2018 - 09:38 AM

 

I am designing distillation column in Aspen Hysys. I got -240C for distillation temperature. How can I increase it. I changed pressure, light key and heavy key compositions but temperature is still -240. 

 

Khayala,

 

In a distillation tower like a deethanizer, temperature is controlled by reboiler duty. Hence in order to increase distillation temperature try to increase the reboiler duty.



#3 Ersan

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Posted 01 February 2018 - 06:02 AM

Try reducing the Reflux flow rate as well.



#4 Technical Bard

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Posted 11 February 2018 - 04:07 PM

The operating pressure of the column is set by the temperature you can run the condenser at.  Additionally, you need to be able to get two phases (i.e. below the critical point).  The critical point of ethane is 32°C and 4884 kPaA, so this means you need to condense below this.  The highest pressure you could realistically design this column for is 4500 kPaA, to stay at least 5% away from the critical pressure.  However, high pressures make separations more difficult (relative volatilities get smaller).  For this reason, most de-ethanizers are run much colder, such as with propane refrigeration on the overhead.  If the refrigerant is at -40°C, then you can likely design to condense at between -35 and -30°C, with an overhead pressure 915-1065 kPaA.   If there is a lot of methane in the system, the pressure will need to be higher because the partial pressure of ethane in the overhead stream will be lower.






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