A chemical kinetic model for NO sub x removal in an aqueous scrubber system using the additive Fe(II)ter dot EDTA

Conference · Wed Jan 01 00:00:00 EST 1992

OSTI ID:6970193

Mendelsohn, M H; Livengood, C D

Addition of the metal chelate, ferrous{center dot} ethylenediaminetetraacetate anion (Fe(II){center dot}EDTA{sup 2{minus}}), has been shown to increase the amount of gaseous nitrogen oxides absorbed from a gas stream containing sulfur dioxide, where an aqueous scrubbing process is used to treat the gas. Recently, we published data on improved systems for NO{sub x} removal that incorporate an antioxidant and/or reducing agent (A/R) in the process along with the Fe(H){center dot}EDTA. The purpose of the A/R is to maintain the highest possible concentration of iron in the +2 form. The major mechanism for NO removal is believed to be the equilibrium reaction of Fe(II){center dot}EDTA with dissolved NO to form a Fe(II){center dot}EDTA{center dot}NO complex. It has been shown that both sulfite and bisulfite anions can react with Fe(II){center dot}EDTA{center dot}NO to regenerate Fe(II){center dot}EDTA and other products. In a complex system, other oxidation and reduction mechanisms are also possible. We have chosen, therefore, to approach this problem empirically by fitting our experimental data to a model containing at most three kinetic terms, chosen from among the following: a baseline removal rate, which is equivalent to the rate of reaction of Fe(II){center dot}EDTA with nitric oxide; a regeneration rate, which is equivalent to decomposition of the Fe(II){center dot}EDTA{center dot}NO complex to Fe(II){center dot}EDTA; an oxidation rate, which is a combined rate for all possible oxidation reactions involving Fe(II){center dot}EDTA; and a reduction rate, which is a combined rate for all possible reduction reactions involving ferric-EDTA in the system.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6970193
• Report Number(s): ANL/CP-75263; CONF-920808-9; ON: DE92040750
• Resource Relation: Conference: American Institute of Chemical Engineers (AIChE) summer national meeting, Minneapolis, MN (United States), 9-12 Aug 1992
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
54 ENVIRONMENTAL SCIENCES
DENITRIFICATION
CHEMICAL REACTION KINETICS
FLUE GAS
NITRIC OXIDE
REMOVAL
ADDITIVES
ANTIOXIDANTS
AQUEOUS SOLUTIONS
CHELATES
COMBINED SOXNOX PROCESSES
EDTA
IRON COMPLEXES
REGENERATION
SCRUBBERS
SULFITES
SULFUR DIOXIDE
AMINO ACIDS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHELATING AGENTS
CHEMICAL REACTIONS
COMPLEXES
DESULFURIZATION
DISPERSIONS
EQUIPMENT
GASEOUS WASTES
KINETICS
MIXTURES
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
REACTION KINETICS
SOLUTIONS
SULFUR COMPOUNDS
SULFUR OXIDES
TRANSITION ELEMENT COMPLEXES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)