Publication Date:
2015-08-08
Description:
Catalyzed reaction of sulfite with oxygen is often used by industry for corrosion protection by chemical deoxygenation. The same reaction system is considered very important as a part of atmospheric chemistry due to SO2 immission modeling. In these applications, reaction kinetic data are of crucial importance. In deoxygenation, low concentrations of sulfite close to the stoichiometric ratio to oxygen are being used. Unfortunately, the values of kinetic constants for the reaction are sparse.The reaction kinetics was investigated in a rapid-mixing apparatus, where air or pure oxygen saturated solution containing the catalyst was mixed with aqueous sulfite solution. Mixing ratios with stoichiometric excess of dissolved oxygen were tested.Analysis of literature data suggests that the reaction is of 1.5 order in sulfite, 0 order in oxygen and 0.5 order in cobalt(II) catalyst. These reaction orders had been confirmed in the concentration range tested. The apparent kinetic constant and activation energy are also presented. Crucial importance of proper mixing of the two reacting solutions is reported, which was revealed during the development of the precise experimental technique providing reliable kinetic data.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
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Process Engineering, Biotechnology, Nutrition Technology
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