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Degree Of Freedom In Distillation Column And Absorption Column

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#1 lnbsak


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Posted 21 July 2021 - 02:45 PM

The reference I am following 

https://www.ou.edu/c... of Freedom.pdf


So according to the reference we have two degrees of freedom 


So if is specify number of stages and and feed locations are the systems fully defined?


So in my case I have strict feed concertation A & B

Distillate purity defined 0.99

Bottom  purity defined 0.99


So that means I have only two variable to play with No of stages and feed locations, I will get Reboiler duty and condenser duty out of the.


The partial condenser that I have will just add (one) stages to both no of  equations available and total no of variables.



Now for absorption column




Feed locations are fixed But I can change the solvent concentration and flowrates and no of stages. To calculate the column cost.


The purity of top product C 0.99 and bottom products D0.99 are fixed. 


Hear I Also see two degree of freedom 


Ami I correct??









#2 Pilesar


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Posted 21 July 2021 - 03:50 PM

There are English grammar problems in your post that make it difficult to understand. Practically, the purities of your products are NOT fixed. Think of a real distillation column and how the measurements might vary for product quality. What would an operator change to get the specs desired? Those are your degrees of freedom. 

#3 breizh


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Posted 21 July 2021 - 09:38 PM


Consider the document attached to support your work

Good luck


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