Q3 A falling film of water at 30oC and total pressure of 1.45 bar is used to absorb a solute (A) from an insoluble gas. The mass transfer coefficient at the given velocity is estimated to be kc = 90.3 kmol/h. m2 (kmol/m3). It is known that 13.6% of the total mass transfer resistance lies in the gas-phase. At a particular section of the apparatus, the mole fraction of the solute in the bulk gas is 0.065 and the interfacial concentration of the solute in the liquid is (0.00201). The equilibrium solubility of the gas in water at the given temperature is:-
PA = 3.138 x*
Where P is the partial pressure of A in gas in mmHg and x* solubility of A in mole fraction, gas constant 0.0831bar. m3/ k. kmol. Calculate:-
1- Absorption flux of the gas at the given section of the apparatus.
2- The bulk liquid concentration at that section of the apparatus.
3- The overall liquid-phase mass transfer coefficient.
4- The individual and overall gas-phase driving forces in terms of ΔP and Δy where 1.013 bar=760 mmHg. . A