Liquid film in Gas Absorption

Hutchinson, Margaret H; Sherwood, T. K.

doi:10.1021/ie50331a023

Cited by 28 publications

(22 citation statements)

References 9 publications

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“…These values of S are comparable to those reported previously for cross-flow ultrafiltration and microfiltration (Koltuniewicz and Noworyta, 1994;Chatterjee, 2010;Hasan et al, 2013). Hutchinson and Sherwood (1937) studied the absorption of eight different pure gases at 25 ºC in a stirred flask containing water with the gas exposed above the stirred surface. Table 5 shows values of the mass-transfer coefficient k L , which they calculated from dissolved-gas concentration measurements, for hydrogen and oxygen at two different stirrer speeds.…”

Section: Brazilian Journal Of Chemical Engineeringsupporting

confidence: 88%

“…Using the theoretical equa- Danckwerts, 1970) where D i is the diffusion coefficient of the dissolved gas in the liquid, we calculated values of S that are also reported in Table 5, along with values of D i that were estimated from values of the diffusion coefficient of the dissolved gas (in water) at 20 ºC given in Table 3 in the paper of Hutchinson and Sherwood (1937) and using the Wilke-Chang correlation (Perry et al, 1984) , respectively, which indicates an increase of 659% for a change in RPM of 500%, and which also indicates that S varies with the RPM raised to a power of 1.13. The values of S derived from the absorption data of Hutchinson and Sherwood (1937) are about one to two orders of magnitude greater than those for crossflow microfiltration, as found in this work. It can be conjectured that high values of S can be obtained in a rotating-disk membrane module such as the one used by Sarkar et al (2011), which will dramatically enhance the permeate flux.…”

Section: Brazilian Journal Of Chemical Engineeringmentioning

confidence: 99%

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Application of a Surface-Renewal Model to Permeate-Flux Data for Constantpressure Cross-Flow Microfiltration With Dean Vortices

Idan

Chatterjee

2015

Braz. J. Chem. Eng.

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-The introduction of flow instabilities into a microfiltration process can dramatically change several elements such as the surface-renewal rate, permeate flux, specific cake resistance, and cake buildup on the membrane in a positive way. A recently developed surface-renewal model for constant-pressure, cross-flow microfiltration (Hasan et al., 2013) is applied to the permeate-flux data reported by Mallubhotla and Belfort (1997), one set of which included flow instabilities (Dean vortices) while the other set did not. The surfacerenewal model has two forms ─ the complete model and an approximate model. For the complete model, the introduction of vortices leads to a 53% increase in the surface-renewal rate, which increases the limiting (i.e., steady-state) permeate flux by 30%, decreases the specific cake resistance by 14.5% and decreases the limiting cake mass by 15.5% compared to operation without vortices. For the approximate model, a 50% increase in the value of surface renewal rate is shown due to vortices, which increases the limiting permeate flux by 30%, decreases the specific cake resistance by 10.5% and decreases the limiting cake mass by 13.7%. The cake-filtration version of the critical-flux model of microfiltration (Field et al., 1995) is also compared against the experimental permeate-flux data of Mallubhotla and Belfort (1997). Although this model can represent the data, the quality of its fit is inferior compared to that of the surface-renewal model.

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Section: Brazilian Journal Of Chemical Engineeringsupporting

confidence: 88%

Section: Brazilian Journal Of Chemical Engineeringmentioning

confidence: 99%

Application of a Surface-Renewal Model to Permeate-Flux Data for Constantpressure Cross-Flow Microfiltration With Dean Vortices

Idan

Chatterjee

2015

Braz. J. Chem. Eng.

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“…Assuming for O 2 gas a transfer constant of the order of 10 À6 m/s [42], values of k w for other gases are deduced from Eq. (49).…”

Section: Where [H 2 ] Is the True Concentration In Solution (Mol/dm 3mentioning

confidence: 99%

A comprehensive model to describe radiolytic processes in cement medium

Bouniol

Bjergbakke

2008

Journal of Nuclear Materials

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“…Convection currents are difficult to assess quantitatively, but their significance is certainly not to be overlooked. Hutchinson and Sherwood (14) found that the absorption coefficients for oxygen in their system were 0.41 cm./hour when there was no stirring of the liquid and increased to 7.64 cm./hour when the stirring speed was increased to 1025 it. 1,.…”

Section: Absorption Of Oxygen In Liquidmentioning

confidence: 96%

The Production of Hydrogen Peroxide by High Oxygen Pressures

Gilbert

Gerschman

Ruhm

et al. 1958

The Journal of General Physiology

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Hydrogen peroxide is formed in solutions of glutathione exposed to oxygen. This hydrogen peroxide or its precursors will decrease the viscosity of polymers like desoxyribonucleic acid and sodium alginate. Further knowledge of the mechanism of these chemical effects of oxygen might further the understanding of the biological effects of oxygen. This study deals with the rate of solution of oxygen and with the decomposition of hydrogen peroxide in chemical systems exposed to high oxygen pressures. At 6 atmospheres, the absorption coefficient for oxygen into water was about 1 em./hour and at 143 atmospheres, it was about 2 em./hour; the difference probably being due to the modus operandi. The addition of cobalt (H), manganese (II), nickel (II), or zinc ions in glutathione (GSH) solutions exposed to high oxygen pressure decreased the net formation of hydrogen peroxide and also the reduced glutathione remaining in the solution. Studies on hydrogen peroxide decomposition indicated that these ions act probably by accelerating the hydrogen perioxide oxidation of glutathione. The chelating agent, ethylenediaminetetraacetie acid disodium salt, inhibited the oxidation of GSH exposed to high oxygen pressure for 14 hours. However, indication that oxidation still occurred, though at a much slower rate, was found in experiments lasting 10 weeks. Thiourea decomposed hydrogen peroxide very rapidly. When GSH solutions were exposed to high oxygen pressure, there was oxidation of the GSH, which became relatively smaller with increasing concentrations of GSH.When reduced glutathione solutions are exposed to high oxygen pressures, there is a significant production of hydrogen peroxide (1). If sodium desoxyribonucleic acid or sodium alginate were present in these solutions there was a decrease in viscosity which was attributed to reaction of these polymers with the hydrogen peroxide formed or its precursors (free radicals). These prooxidative effects of glutathione are inhibited by ethylenediaminetetraacetic acid disodium salt (EDTA) and thiourea. It has been found that agents

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Liquid film in Gas Absorption

Cited by 28 publications

References 9 publications

Application of a Surface-Renewal Model to Permeate-Flux Data for Constantpressure Cross-Flow Microfiltration With Dean Vortices

Application of a Surface-Renewal Model to Permeate-Flux Data for Constantpressure Cross-Flow Microfiltration With Dean Vortices

A comprehensive model to describe radiolytic processes in cement medium

The Production of Hydrogen Peroxide by High Oxygen Pressures

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