Oxidative degradation of organic acids conjugated with sulfite oxidation in flue-gas desulfurization. Final report, June 1984-June 1986

Technical Report · Mon Feb 01 04:00:00 EST 1988

OSTI ID:5329692

Lee, Y J; Rochelle, G T

This 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.

• Research Organization: Texas Univ., Austin (USA). Dept. of Chemical Engineering
• OSTI ID: 5329692
• Report Number(s): PB-88-180674/XAB
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
ADIPIC ACID
AIR POLLUTION CONTROL
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
DICARBOXYLIC ACIDS
DOCUMENT TYPES
FLUE GAS
GASEOUS WASTES
KINETICS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
POLLUTION CONTROL
PROGRESS REPORT
REACTION KINETICS
SULFITES
SULFUR COMPOUNDS
WASTES