Kinetic Study of Ambient-Temperature Reduction of FeIIIedta by Na2S2O4

Autor:	Barbara Mathews, Tomasz T. Suchecki, Hidehiro Kumazawa
Rok vydání:	2005
Předmět:	Aqueous solution Reducing agent Chemistry General Chemical Engineering Inorganic chemistry Batch reactor General Chemistry Dithionite Industrial and Manufacturing Engineering Ferrous chemistry.chemical_compound Limiting oxygen concentration Absorption (chemistry) NOx
Zdroj:	Industrial & Engineering Chemistry Research. 44:4249-4253
ISSN:	1520-5045 0888-5885
DOI:	10.1021/ie0493006
Popis:	The chelate method can provide simultaneous control of combustion flue gases SO2/NOx by scrubbing into aqueous solutions of ferrous chelates, e.g., FeIIedta, an ethylenediaminetetraacetic acid. Because of oxidation of FeIIedta to completely inactive in the system FeIIIedta, the absorption solution requires regeneration. A new proposal here for this process is based on the direct reduction of FeIIIedta by a dithionite ion, S2O42-. The rate equation for the reduction of FeIIIedta by dithionite was derived in terms of the rate-determining-step approximation method. A kinetic study of this process was conducted by using a bubbling-type batch reactor. The following initial parameters were examined: FeIIIedta and Na2S2O4 concentrations, pH, and oxygen concentration. It was concluded that dithionite is a promising reducing agent for the regeneration of the absorption solution of the chelate method. The ambient-temperature regeneration process should be operated under the following conditions: pH0 = 3.5−9.0 and...
Databáze:	OpenAIRE
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