A gas absorber is used to reduce the carbon dioxide content of a gas through contact with an aqueous diethanolamine solution. The following results are obtained.
Pressure of operation, atm 0.967
Molecular weight of solvent, lb/lb-mole 24
Entering liquid rate, lb/(sec-ft²) 0.684
Equilibrium partial pressure of CO2
For entering liquid, atm 0
For exiting liquid, atm 0.0658
Entering gas rate, lb-mole/(sec-ft²) 0.00181
CO2 in entering gas, vol% 13.0
CO2 in exiting gas, vol% 8.0
Determine the CO2 concentration (mole fraction) in the exit liquid.