Question

The exit gas from an alcohol-fermenter consists of an air- CO. mixture containing 10 mol% CO, is to be absorbed in triethanolamine solution, containing 0.03 mol of CO, per mole of amine solution. The column is operated isothermally at 25 °C and Table 1 shows the equilibrium data for the system. The outlet gas contains 2.5 mol % of CO, and the absorption is carried out in a three theoretical plates Table 1: Equilibrium Data (mole CO./mole air) (mole CO/mole amine solution) 0.003 0.008 0.015 0.023 0.032 0.043 0.055 0.068 0.083 0.099 0.12 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.11 u) Determine the composition of the CO2 in the exit liquid (17 Marks) 2) If the flowrate of the inert triethanolamine set at stream 90kmol/hr, what is the flowrate of inlet and outlet gases? (8 Marks)

Answer 1

Soe non 2, y 2 moles 어 SoNen - mole Prain solu LI a i

moles ofar moles of CO2 ols o dmine moles O 025 0.0.2564 2- 025 oe motes a amioe soluonis FedPemsle CO2 Fsoe gas Applyng mole bodoncc 011-O 025 X 0.03959 2 NlOUS

L-moles\ ( o moles of dmne . 82 moles of (02 moles of amine moles 어(02= 2.j kmol/h GI, moles 야 Co2 + moles of mo les of co2 moley of di 0