Absorption
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When carbon dioxide in the air is absorbed using water under normal pressure in countercurrent flow, how does the overall mass transfer coefficient in the gas phase change if the amount of water used is increased?
The mass transfer coefficient is based on the fact that the mass transfer rate G is directly proportional to both the mass transfer area F and the mass transfer driving force Δ. The mass transfer area is the area of interphase contact. The driving force can take the form of the average of various differential concentrations or pressure differences. That is, G = KF△mean. In the formula, K is the mass transfer coefficient. With the area remaining constant and the concentration difference increasing, the mass transfer driving force Δμ increases~~~ The change in mass transfer rate is small~~~ As a result, K decreases. Please give me some advice, expert.
Why does the mass transfer rate decrease?
The analysis factor S = M*G/L; as L increases, S decreases, and the driving force for absorption increases. Since HOG = V/KyQ, Ky decreases.