A chemical kinetic model for NO{sub x} removal in an aqueous scrubber system using the additive Fe[II]{center_dot}EDTA

Conference · Tue Sep 01 00:00:00 EDT 1992

OSTI ID:10182281

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, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10182281
• 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; Other Information: PBD: [1992]
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
54 ENVIRONMENTAL SCIENCES
FLUE GAS
DENITRIFICATION
CHEMICAL REACTION KINETICS
NITRIC OXIDE
REMOVAL
IRON COMPLEXES
EDTA
SCRUBBERS
SULFUR DIOXIDE
ADDITIVES
AQUEOUS SOLUTIONS
COMBINED SOXNOX PROCESSES
ANTIOXIDANTS
SULFITES
CHELATES
REGENERATION
010800
200202
540120
WASTE MANAGEMENT
NOXIOUS GAS AND PARTICULATE EMISSIONS
CHEMICALS MONITORING AND TRANSPORT