Degradation Kinetics of Fe-EDTA in Hydrogen Sulfide Removal Process release_uwpbh7vzuzhgrmm65pxrqmdgm4

by R. Saelee, C. Bunyakan

Published in ISRN Chemical Engineering by Hindawi Limited.

Volume 2012p1-8 (2012)

Abstract

Available data on the degradation of Fe-EDTA liquid redox H<jats:sub>2</jats:sub>S removal processes are reviewed, and the effect of H<jats:sub>2</jats:sub>S molar flow rate, the initial concentration of Fe(III)EDTA, and the presence of sodium citrate in Fe-EDTA solution were investigated in this study. The semibatch with continuous flow of H<jats:sub>2</jats:sub>S containing biogas was used under a wide range of experimental conditions; , H<jats:sub>2</jats:sub>S molar flow rate, (1.08 × 10<jats:sup>−3</jats:sup>–3.40 × 10<jats:sup>−3</jats:sup> mol/h), the initial concentration of Fe(III)EDTA, (2.17–8.16 mol/m<jats:sup>3</jats:sup>), and the concentration of sodium citrate, (0–300 mol/m<jats:sup>3</jats:sup>). The result showed that sodium citrate acted as stabilizer with a good ability to reduce the degradation rate. The degradation rate of Fe-EDTA was found to follow pseudo first-order kinetics. Empirical correlations expressed the degradation rate constant as a function of significant H<jats:sub>2</jats:sub>S molar flow rate, and the initial Fe(III)EDTA and sodium citrate concentration were successfully developed for the prediction of Fe-EDTA degradation rate. Moreover, the precipitated solid, called sulfur cake, was recovered, and its composition was investigated. The result revealed that the sulfur cake contained more than 98% sulfur element and almost balances with iron, and no significant EDTA was degraded into the solid form.
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