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

Technical Report · Mon Feb 01 00:00:00 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
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLUE GAS
DESULFURIZATION
ORGANIC ACIDS
OXIDATION
SULFITES
ADIPIC ACID
AIR POLLUTION CONTROL
PROGRESS REPORT
REACTION KINETICS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CONTROL
DICARBOXYLIC ACIDS
DOCUMENT TYPES
GASEOUS WASTES
KINETICS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION CONTROL
SULFUR COMPOUNDS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry