Project ForgeMass Transfer
Mass Transfer Operations
GATE 2017
Hard
Countercurrent stripping with pure steam reduces solute mole ratio in the liquid from X=0.25 to X=0.05. Solute-free liquid feed=3 mol/s. Equilibrium line: Y*=0.6X. The MINIMUM flowrate of pure steam, rounded to 1 decimal place, is
4 mol/s(± 0.15 accepted)
Explanation
At minimum gas rate, exit gas is in equilibrium with entering liquid (X=0.25): Ymax=0.6×0.25=0.15. Gmin=L(Xin−Xout)/(Ymax−Yin)=3×0.20/0.15=4.0 mol/s.
Source: GATE CH 2017 (2017)
This question is part of a 15-day revision cycle — sign in and Project Forge will bring it back the day before you'd forget it.