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Main Title Oxidative degradation of organic acids conjugated with sulfite oxidation in flue gas desulfurization /
Author Lee, Y. Joseph. ; Rochelle, G. T.
Other Authors
Author Title of a Work
Rochelle, Gary T.
CORP Author Texas Univ. at Austin. Dept. of Chemical Engineering.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher U.S. Environmental Protection Agency, Air and Energy Engineering Research Laboratory,
Year Published 1988
Report Number EPA/600/2-88/018
Stock Number PB88-180674
Subjects Organic acids--Deterioration ; Sulfites ; Oxidation ; Flue gases--Desulfurization ; Sulphites ; Flue gases--Desulphurization
Additional Subjects Organic acids ; Degradation ; Sulfites ; Oxidation ; Flue gases ; Desulfurization ; Adipic acid ; Buffers(Chemistry) ; Reaction kinetics ; Air pollution control ; Limestone scrubbing
Library Call Number Additional Info Location Last
NTIS  PB88-180674 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 173 pages ; 28 cm
The report gives results of a study of organic acid degradation conjugated with sulfite oxidation under flue gas desulfurization (FGD) conditions. The oxidative degradation constant, k12, is defined as the ratio of organic acid degradation rate and sulfite oxidation rate times the ratio of the concentrations of dissolved S(IV) and organic acid. It is not significantly affected by pH or dissolved oxygen in the absence of Mn or Fe. However, k12 is increased by certain transition metals such as Fe, Co, and Ni, and is decreased by Mn and halides. Lower dissolved S(IV) magnifies these effects. A free radical mechanism was proposed to describe the kinetics. Hydroxy and sulfonated carboxylic acids degrade approximately three times slower than saturated dicarboxylic acids; while maleic acid, an unsaturated dicarboxylic acid, degraded an order of magnitude faster. A wide spectrum of degradation products of adipic acid were found, including carbon dioxide (the major product), smaller dicarboxylic acids, monocarboxylic acids, other carbonyl compounds, and hydrocarbons.