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Effective interfacial area determination by gas absorption accompanied by second‐order irreversible chemical reaction
Author(s) -
Matheron Erik R.,
Sandall Orville C.
Publication year - 1979
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690250217
Subject(s) - agitator , chemistry , absorption (acoustics) , mass transfer , sodium hydroxide , carbon dioxide , aqueous solution , mass transfer coefficient , analytical chemistry (journal) , thermodynamics , chromatography , materials science , organic chemistry , composite material , physics
Oxygen and carbon dioxide were absorbed by aqueous sodium hydroxide solutions in an agitated vessel, and the experimental results were interpreted in terms of the surface renewal theory in order to deduce effective interfacial areas. The simultaneous physical and chemical absorption experiments permitted a determination of the enhancement factor under identical physicochemical and hydrodynamic conditions. It was found that for the unbroken interface case, the effective areas for physical and chemical absorption are equal when the Danckwerts parameter γ is approximately unity. γ is defined as the ratio of the increase in absorption capacity of the liquid to the enhancement factor. For the case where the gas is sparged through the liquid, it was found that the effective interfacial area is a strong function of agitator speed (above a critical speed) and gas flow rate, whereas the mass transfer coefficient was found to be nearly independent of agitator speed and gas sparge rate.