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A comprehensive study on co 2 ‐interphase mass transfer in vertical cocurrent and countercurrent gas‐liquid flow
Author(s) -
Deckwer W.D.,
Adler I.,
Zaidi A.
Publication year - 1978
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450560107
Subject(s) - countercurrent exchange , interphase , mass transfer , bubble , coalescence (physics) , mechanics , chemistry , analytical chemistry (journal) , hydrostatic equilibrium , thermodynamics , volumetric flow rate , desorption , materials science , chromatography , adsorption , physics , organic chemistry , quantum mechanics , biology , astrobiology , genetics
Cocurrent and countercurrent absorption and desorption of CO 2 in water was investigated in tall bubble columns (length 440 and 720 cm, diameter 15 and 20 cm, respectively). Operating conditions were applied which provided for high interphase mass transfer rates. Under these circumstances the relative gas holdup varies considerably with axial position whereas the mean bubble diameter measured at two points was found to be approximately constant. The measured data permit the calculation of local values of interfacial areas, superficial gas velocities, and frequency factors for bubble coalescence and break up. A dispersion model which takes into account the hydrostatic head and a variable gas velocity was applied to describe the measured concentration profiles in both phases. If increased mass transfer coefficients at the column bottom and measured local values of the hold up were used a striking agreement between experimental and predicted profiles could be obtained. The findings lead to a more sophisticated picture of the complex behaviour of gas‐liquid dispersions at high interphase mass transfer rates.