CH ENGR 101C Quiz: Problem Set 10 (extra practice)
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9 Jan 2019
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air-H2S mixture is flowing by a film of water that is flowing as a thin film down a vertical plate. H2S is being absorbed. P = 1.5 atm and T= 303K. K'c= 9.567*10^-4 m/s and pA (atm) = 609xA (liquid mole fraction). Na=-1.485 *10^-6 kg-mol/s*m^2.
a) Convert the gas-phase mass-transfer coefficient, kc ' , to k y ' and k G ' . |
b) Based on the flux calculated above, calculate the liquid-phase mass-transfer |
coefficient, kc ' , at this point in the tower. |
c) Convert the liquid-phase mass-transfer coefficient, kc ' , to k x ' . |
d) Calculate Kyâ, Kxâ and the percent resistance offered by the gas and liquid phases. |
e) Sketch both the concentration profiles (i.e., cA vs distance) and the mole-fraction |
profiles (i.e., xA and yA vs distance) in the gas and liquid phases. Clearly indicate |
values at the interface and bulk. |
Again consider the falling film in TP 7.2-3, but assume negligible gas-phase mass |
transfer (i.e., xA1 â 2 Ã 10-5). What value of z (see Equation 7.3-22) corresponds to NA |
= -1.485 Ã 10-6 kg-mole/sâ m2? Assume the diffusion coefficient for water-H2S is DAB = |
10-9 m2/s, the liquid has the properties of pure water, and the liquid film is |
approximately 2 mm thick (see section 2.9C for more information on the velocity |
profile in a following film). Calculate kcʹ in the gas and liquid phases at this z and at a |
z half this value. Sketch both the concentration profiles and the mole-fraction profiles |
in the gas and liquid phases. Again, clearly indicate values at the interface and bulk. |