Effect of Diffusivity on Gas-Film Absorption Coefficients in Packed Towers

Surosky, Alan E.; Dodge, Barnett F.

doi:10.1021/ie50486a023

Cited by 31 publications

(16 citation statements)

References 6 publications

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“…The values of these exponents are much lower than those generally proposed by correlations for k G which range between 1/2 and 2/3. 2 Sherwood and Holloway 88 and Surosky and Dodge 91 concluded that eddy diffusivity plays an important role in establishing the gas-side mass transfer rate, but they did not consider the effect of liquid properties on a e (especially surface tension), which may have led to underestimated diffusivity exponents. Shulman and Delaney 94 vaporized CCl 4 into air already containing the substance at different concentration levels in order to study the effect of p BM , the mean partial pressure of the inert carrier gas.…”

Section: Vaporizationmentioning

confidence: 99%

“…This approach is not theoretically sound, as the dependency of H E on G and L might not be the same as for the packing. 71,93 The equivalent bed height can be determined by trial and error 91,93 : it is the extra packed bed height that has to be added to the physical one to bring the results of different bed heights into agreement.…”

Section: Treatment Of Internal and External End Effectsmentioning

confidence: 99%

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Absorption methods for the determination of mass transfer parameters of packing internals: A literature review

et al. 2017

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Methods for the determination of mass-transfer coefficients and effective interfacial areas in packed absorption columns are reviewed. For each parameter, the methods are grouped into categories on the basis of their physical principle; the chemical systems used, experimental protocol, and the advantages and inconveniences are discussed. The treatment of end effects, the influence of packed bed height, and the recent efforts in standardization of measurement methods are also treated. The aim of the review is to give a broad overview of the methods used in literature in the last eight decades , some of which might be reconsidered in the light of modern measurement techniques and to evaluate them in relation to precision, practicality and hazardousness thereby to facilitate the search for reliable, precise, and convenient experimental practices.

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Section: Vaporizationmentioning

confidence: 99%

Section: Treatment Of Internal and External End Effectsmentioning

confidence: 99%

Absorption methods for the determination of mass transfer parameters of packing internals: A literature review

et al. 2017

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“…Using Equation 9, it was difficult to obtain calculated values of xML at the opposite end of the tower that were consistent with those observed experimentally. To obtain a reasonable comparison, it was necessary to use trial values of that were about ten times higher than those expected based on the work of others (29,30,42). Furthermore, some of the calculated axial profiles for xML disagreed considerably with those observed experimentally.…”

Section: Discussionmentioning

confidence: 93%

“…To obtain a reasonable comparison, it was necessary to use trial values of that were about ten times higher than those expected based on the work of others (29,30,42). To obtain a reasonable comparison, it was necessary to use trial values of that were about ten times higher than those expected based on the work of others (29,30,42).…”

Section: Discussionmentioning

confidence: 99%

Analysis of simultaneous heat and mass transfer in the stripping of methanol from aqueous solutions

Blackwell

Murray²,

Oldham³

1984

Can J Chem Eng

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Methanol was stripped from a dilute aqueous solution under countercurrent conditions in a pilot scale packed tower, using a gas prepared by mixing air and steam in various proportions. A mathematical model involving simultaneous heat and mass transfer was developed to describe the situation; this model included consideration of fog formation, column pressure drop and heat loss to the environment. Results from the model, including axial profiles for liquid temperature and liquid phase methanol concentration, were reasonably consistent with experimental measurements. Practical use of the model is presently limited by unresolved problems with sensitivity and occasional instability of the analysis. Nonetheless, the mechanism developed may form the basis for an improved model to describe complex situations involving stripping/absorption with significant effects. Pressure drop through the packing was an important consideration in the theoretical analysis of the experimental results.On a extrait le methanol d'une solution aqueuse diluie, dans une colonne garnie a I'Cchelle pilote avec alimentation

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“…Jia et al showed that the presence of ethanol in the gas phase could lead to an imbalance in the surface tension and alteration of the mass transfer coefficient for CO 2 absorption. Surosky and Dodge showed that the value of the convective coefficient increased when the diffusivity increased. Furthermore, studies of oxygen mass transfer in bioreactors , have reported dependence of the mass transfer coefficients on the gas and liquid physical properties.…”

Section: Resultsmentioning

confidence: 99%

Ethanol Recovery from Stripping Gas Mixtures by Gas Absorption: Experimental and Modeling

et al. 2018

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Ethanol removal by CO2 stripping during alcoholic fermentation is one way of overcoming the problem of inhibition by the product. However, the lack of efficient methods to recover ethanol from the gas phase still makes the use of stripping unviable. In this work, gas absorption was evaluated as a method for the recovery of ethanol from the gas mixture generated by CO2 stripping. First, the solvents water, monoethylene glycol (MEG), and diethylene glycol were evaluated in terms of their performance in ethanol absorption. MEG was selected as the most appropriate absorbent because it provided a satisfactory ethanol recovery percentage, in addition to the fact that it is already used in distilleries to obtain anhydrous ethanol. Subsequent assays using MEG were conducted to investigate the influence of the initial MEG volume in the absorber, the recirculation volumetric flow rate of solvent, and the use of two absorbers connected in series. A modeling procedure was developed based on mass balance equations for the species involved (ethanol, water, CO2, and MEG), stripping and absorption kinetics, and vapor–liquid equilibrium concepts and was able to accurately describe the process behavior. The use of two absorbers, each with 0.80 L of MEG, enabled recovery of up to 93.1% of the ethanol from the stripping gas mixture. The results showed that gas absorption with MEG is a highly promising strategy for ethanol recovery, with potential for applications in industrial ethanol fermentation processes.

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Effect of Diffusivity on Gas-Film Absorption Coefficients in Packed Towers

Cited by 31 publications

References 6 publications

Absorption methods for the determination of mass transfer parameters of packing internals: A literature review

Absorption methods for the determination of mass transfer parameters of packing internals: A literature review

Analysis of simultaneous heat and mass transfer in the stripping of methanol from aqueous solutions

Ethanol Recovery from Stripping Gas Mixtures by Gas Absorption: Experimental and Modeling

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