Research on the Treatment Technology of Sulfur-Containing Tail Gas Using Chelated Iron
DOI:
https://doi.org/10.54691/p34jx706Keywords:
Chelated Iron; Complexation Capacity; H₂S Removal.Abstract
This study investigates a chelated iron‑based process for H₂S removal from sulfur‑containing tail gas. Eight chelating agents were evaluated for iron complexation capacity at different pH values. The effects of pH, chelator mixing ratio, and Fe³⁺/Fe²⁺ molar ratio on desulfurization performance were examined through 42 complex systems using MATLAB regression analysis. Results show that pH 8–9 enables >90% H₂S absorption. HEDP exhibited the highest iron complexation capacity (30.8 g/L at pH 10) but poor stability; TEA and HEDTA performed stably across the tested pH range. Among the three factors, pH showed the strongest synergistic effect, followed by chelator ratio, while Fe³⁺/Fe²⁺ ratio had the weakest effect. Optimal combinations for binary chelator systems were identified. The developed novel iron‑based desulfurization solution demonstrates promising potential for industrial application.
Downloads
References
[1] Qi, G., Liu, Y., & Jiao, W. (2011). Study on industrial application of hydrogen sulfide removal by wet oxidation method with high gravity technology. China Petroleum Processing and Petrochemical Technology, 13(4), 29–34.
[2] Xiao, J., Yang, J., & Hao, A. (2003). Abroad research progress of H₂S removing process with chelated iron. Journal of Chemical Industry & Engineering, 24(5), 41–44.
[3] Hu, Y. (2007). High-efficiency H₂S removal process—LO-CAT. Petroleum Refinery Engineering, 37(11), 30–35.
[4] Zhang, W., He, J., Chang, H., et al. (2008). The applications status and prospect analysis of iron-redox desulfurization technology. Chemical Engineering of Oil & Gas, 37, 130–133.
[5] Martell, A. E., Motekaitis, R. J., & Chen, D. (1996). Selection of new Fe(III)/Fe(II) chelating agents as catalysts for the oxidation of hydrogen sulfide to sulfur by air. Canadian Journal of Chemistry, 74(10), 1872–1879. https://doi.org/10.1139/v96-211.
[6] Piche, S., Ribeiro, N., & Bacaoui, A. (2005). Assessment of a redox alkaline/iron-chelate absorption process for the removal of dilute hydrogen sulfide in air emissions. Chemical Engineering Science, 60(22), 6452–6461. https://doi.org/10.1016/j.ces.2005.05.047.
[7] Hardison, L. C., & Ill, B. (1992). Method and apparatus for removing H₂S from a process gas and recovering sulfur (U.S. Patent No. 5,122,351). U.S. Patent and Trademark Office.
[8] Marcus, Y., & Kertes, A. (1969). Ion exchange and solvent extraction of metal complexes. Wiley-Interscience.
Downloads
Published
Issue
Section
License
Copyright (c) 2026 Scientific Journal of Technology
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
