4 replies to this topic

[ashokg9]

Hi,
When I calculated the minimum reflux ratio from Mc Cabe Thiele method and Underwood equation, I got negative value. Please suggest how to find optimum reflux ratio in this type of situation.

Thanks,


Ashok

[breizh]

Ashok ,

Consider this resource :

http://books.google....derwood&f=false


Hope this helps

Breizh

[ashokg9]

Thank you Breizh.

I used the Underwood equation to calculate minimum reflux ratio for a 3 component mixture [formula taken from Unit operations of chemical engineering, Mc Cabe Smith], but the value of minimum reflux ratio [(L/D)min + 1] is -0.68. Now, Rmin = (L/D)min = -0.68-1 = -1.68. How can I proceed further to calculate value of Rmin..?

[breizh]

Consider this resource from Ludwig .

Hope this helps

Breizh



http://books.google....epage&q&f=false


An other esource is "Distillation design "by Henry Z Kister

Edited by breizh, 29 September 2011 - 12:32 AM.

[ashokg9]

Thanks Breizh