Project ForgeFor which of the following combinations, does the absorption operation become gas-film controlled? P. The solubility of gas in the liquid is very high. Q. The solubility of gas in the liquid is very low. R. The liquid-side mass transfer coefficient is much higher than the gas-side mass transfer coefficient. S. The liquid-side mass transfer coefficient is much lower than the gas-side mass transfer coefficient.
- AP & Q
- P & R
- CP & S
- DQ & R
Explanation
Gas-film control occurs when the liquid-side resistance is negligible relative to the gas-side. This happens when the gas is highly soluble (P, small Henry's constant minimizes the liquid-side driving force needed) and/or when the liquid-side coefficient is much larger than the gas-side coefficient (R, so 1/kL≪1/kG). So P & R.
Source: GATE CH 2012 (2012)
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