Zur Kinetik des Stoffaustausches zwischen Gasen und Flüssigkeiten

Vielstich, W.

doi:10.1002/cite.330280806

Cited by 19 publications

(3 citation statements)

References 17 publications

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“…The absorption of gas into a liquid jet, such as shown in Fig. 2, is widely used to determine diffusion coefficients for a number of reasons (15,22,29,50,52,76,85,91,94,102,121,136,144,145). Jets are simple in design, have freedom from ripples, have small end effects, are stable, and have such short contact time that surface active agents do not have time to adsorb on the surface.…”

Section: A Diaphragm Cells (Porous Disks)mentioning

confidence: 99%

Diffusion of Dissolved Gases in Liquids

Himmelblau¹

1964

Chem. Rev.

461

203

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Section: A Diaphragm Cells (Porous Disks)mentioning

confidence: 99%

Diffusion of Dissolved Gases in Liquids

Himmelblau¹

1964

Chem. Rev.

461

203

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“…Equal mass transfer coefficients for absorption and desorption have been reported by Allen (1938) for the CO2-water system in a column packed with Ys-in. Raschig rings, by Vielstich (1956) for the COz-water and Coydecalin systems in freely falling laminar jets, and by Carlson (1911) for the Os-water and Cos-water systems in stirred vessels. But Emmert and Pigford (1954), using wetted wall columns studied the 02-water and COz-water systems and have reported significant differences between the two processes.…”

Section: Introductionmentioning

confidence: 98%

“…15, No. 4, 1976 Vielstich (1956) for the C02-water and C02-decalin systems in freely falling laminar jets, and by Carlson (1911) for the 02-water and C02-water systems in stirred vessels. But Emmert and Pigford (1954), using wetted wall columns studied the 02-water and C02-water systems and have reported significant differences between the two processes.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Gas Desorption from Aqueous Solution

Thuy¹,

Weiland²

1976

Ind. Eng. Chem. Fund.

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The desorption of COP from supersaturated water solution has been extensively studied using a string-of-spheres apparatus. Dissolved gas supersaturation, liquid flow rate, gas phase composition, and the nature of the solid spherical surfaces were varied. When the ratio of the partial pressure of dissolved gas to total system pressure was below unity, mass transfer was purely diffusional whereas for values of this ratio greater than unity, desorption was accompanied by the rapid generation of gas bubbles. Spheres which were artificially roughened gave higher bubbling desorption rates than smooth polished spheres. No such differences were detected in the absence of bubbling. Mass transfer coefficients were found to be higher for absorption than for non-bubbling desorption.

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Liquid‐side mass transfer coefficients in packed towers

Onda¹,

Sada²,

Murase³

1959

AIChE Journal

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The physical absorption of gas by water in a tower packed with Raschig rings has been investigated. The liquid-side mass transfer coefficient which was separated by dividing the capacity coefficient by the wetted surface area is discussed from the standpoints of the two-film and penetration theories. A new and simpler dimensionless group is presented which correlates about 90% of the data reported, including the author's own, within an accuracy of f20%.The relation of the liquid-side mass transfer coefficient t o parked-tower performance and physical properties of the system is iniportant from the standpoint of packed-tower designs and interesting from the viewpoint of the mechanism of mass transfer. I n this paper physical gas absorption by water in a tower packed with Raschig rings is described, and kL is discussed. The relation of kL, which covers about 90% of the data reported, including the authors', within a 207, accuracy, was obtained. EXPERIMENTS AND RESULTSThe absorption of pure carbon dioxide by water was studied. T o ascertain the exponent of the Schmidt number, the absorption of pure hydrogen was also studied. Because the degree of purity of the gas was more than 99%, the gas-side resistance was regarded as negligible in comparison with the liquid-side resistance. The mass velocity of the liquid was ascertained by the measurement of the quantity of water flowing from the tower bottom per unit time. The termperatures at the top and bottom of the tower were almost the same and were maintained a t 25 f 1°C.T o measure the end effect samples were taken from the lower tower end and the funnel which was placed immediately below the support plate of the packing.For carbon dioxide a sample of 50 cc. was introduced into 0.2N barium hydroxide solution and then back titrated with 0.1N hydrogen chloride solution. The end effect for 6-, &, and 10-mm. Raschig rings was equivalent to a packing height of 3.6, 3.5, and 3.1 cm. respectively. Water Fig. 1 . Schematic diagram of the absorption system.For hydrogen a sample of 500 cc. was withdrawn by Swanson and Hulett's method (21) and analyzed by the explosion method.As stated above, the gas used was of more than 99% purity, and therefore the gas-side resistance could be assumed to be negligible. The liquid-side capacity coefficient can consequently be computed fromThe saturated concentration C, at 25°C. was taken from the International Critical Tables*.The results for carbon dioxide are shown in Figures 2, 3, and 4. I n these cases it is known by previous reports ( 1 1,16,24) that the gas velocity has no relation to the liquid-side capacity Coefficient under its loading point, and here it was about 50 -150 kg./(sq. m.)(hr.) [I1 -31 lb./ (sq. ft.)(hr.)].To test the dumped packing method the tower was repacked with 6-mm. Raschig ring, and the capacity coefficient was measured. The reproducibility was good (Figure 2).The capacity coefficient increases linearly with the increase of liquid velocity; that is,where for 6-, 8 , and 10-mm. Raschig rings c' and rn" were almost t...

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Zur Kinetik des Stoffaustausches zwischen Gasen und Flüssigkeiten

Cited by 19 publications

References 17 publications

Diffusion of Dissolved Gases in Liquids

Diffusion of Dissolved Gases in Liquids

Mechanisms of Gas Desorption from Aqueous Solution

Liquid‐side mass transfer coefficients in packed towers

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