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[Abdulrazzaq S. Abdullah]

I convert reboiled absorber to distillation , the top gas out is condensed and part of it return to the top as recycle.How I can make the recyle as specified variable in absorber?

[FRBChemE]

Somehow I do not think you can.  There are not enough degrees of freedom.  Incidentally what software are you using.  I would recommend "ChemSep".  It is free for the lite version and just simulate the distillation.  Perhaps the easiest set of specifications are the bottoms flow rate and the Reflux Ratio.  Then on the second go have a look at the RR suggested in the results.