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Oxygen absorption in alkaline sodium dithionite solutions

✍ Scribed by F. Camacho Rubio; Ma.P. Paez Dueñas; G. Blazquez Garcia; J.M. Garrido Martin

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
631 KB
Volume
47
Category
Article
ISSN
0009-2509

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✦ Synopsis

The absorption rate of oxygen in alkaline sodium dithionite solutions, in a stirred tank with a flat interfacial surface, has been studied experimentally. Under the conditions studied (12.0 < pH Q 13.7, 2045"C, partial oxygen pressure 0.20 at 1 atm and a dithionite concentration of O.OOWIk20 M), absorption occurs by means of a fast reaction of zero order in oxygen and 1.5 order in dithionite. A chain mechanism of free radicals is proposed to explain these results and the apparent kinetic constant is adjusted to the following equation as a function of temperature: k = 3.22 x 10s exp (-Y), . mol-cJ.5 m1.5 s-1

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