Decomposition of Sodium Thiosulfate and Sodium Thiocyanate in Supercritical Water
Open accessAbstract
For the purpose of establishing recycle technology to reduce environmental load, technical and practical development of supercritical water is required. An area of high impact on above purpose is in the recycling of sulfur-containing wastes that are produced in gas clean-up facilities of coal gasification processes. For this purpose, pseudo-first order rate constants were evaluated for thiosulfate ion and thiocyanic ion decomposi-tion in subcritical water and in supercritical water (SCW). Experiments were conducted to decompose so-dium thiosulfate and sodium thiocyanate at 340-400°C and at 25MPa. Thiosulfate ion could be decomposed 100% in 10s reaction time to sulfite, sulfate, and sulfide ions in SCW. Thiocyanic ion could be decomposed 20% in 30s in SCW. When thiosulfate ion was added to sodium thiocyanate solution, however, decomposition rate increased to about 30%. Main reaction pathways and kinetics were determined with a flow reactor. The results show that thiosulfate ion can be completely decomposed in SCW, but that decomposition of thiocyanic ion in SCW requires different conditions, additives, or oxidants.
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Thiosulfate is known to readily decompose above 250°C.
“thiosulfate is known to readily decompose above 250 • C [72].”
From Sub- and Supercritical Water Liquefaction of Kraft Lignin and Black Liquor Derived Lignin (2020) · cites this paper as [72]
The paper reports that thiosulfate ion decomposed completely within 10 seconds in supercritical water at 25 MPa, with experiments conducted at 340–400°C (opening summary; page not available). This supports rapid decomposition under those conditions, but it does not establish that thiosulfate readily decomposes throughout the range above 250°C or under unspecified conditions. (LLM, conf=0.88)
Experimental — accuracy not yet measuredSodium thiosulfate decomposes readily into sulfite, sulfate, and sulfide ions.
“Sodium thiosulfate readily decomposes into a mixture of sulfite, sulfate, and sulfide ions 36 .”
From Continuous Extraction of Black Liquor Salts under Hydrothermal Conditions (2021) · cites this paper as [36]
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Sorted by citations
Sub- and Supercritical Water Liquefaction of Kraft Lignin and Black Liquor Derived Lignin
Lappalainen, J., Baudouin, D., Hornung, U., Schuler, J., Melin, K., Bjelić, S., Vogel, F., Konttinen, J., & Joronen, T. (2020) · Energies · doi:10.3390/en13133309 · Cited by 87 · see citing works
“Unfortunately, no data is available on the phase behavior of sodium sulfite, but thiosulfate is known to readily decompose above 250 ◦C [72].”
BackgroundLignite sulfur transformation during the supercritical water gasification process
Chen, G., Chen, S., Song, Z., Zhao, X., & Ma, C. (2015) · Journal of Analytical and Applied Pyrolysis · doi:10.1016/j.jaap.2015.09.014 · Cited by 33 · see citing works
Sulfur transformation mechanism during supercritical water gasification of black liquor
Lu, L., Wei, W., Liu, F., Ge, Z., Jin, H., Chen, Y., & Guo, L. (2023) · Fuel · doi:10.1016/j.fuel.2022.127333 · Cited by 22 · see citing works
Wang, R., Lu, L., Chen, J., Kou, J., Jin, H., & Guo, L. (2021) · Journal of Molecular Liquids · doi:10.1016/j.molliq.2021.115654 · Cited by 22 · see citing works
Continuous Extraction of Black Liquor Salts under Hydrothermal Conditions
Wang, R., Deplazes, R., Vogel, F., & Baudouin, D. (2021) · Industrial & Engineering Chemistry Research · doi:10.1021/acs.iecr.0c05203 · Cited by 20 · see citing works
Canabarro, N. I., Yeadon, D. J., Wörner, M., Hornung, U., Vogel, F., & Baudouin, D. (2024) · The Journal of Supercritical Fluids · doi:10.1016/j.supflu.2024.106230 · Cited by 5 · see citing works
Decomposition of Thiocyanate Ion by Sub- and Supercritical Water Oxidation
Ihara, K., Ueda, H., Sue, K., NONAKA, T., & Arai, K. (2008) · Journal of the Japan Institute of Energy · doi:10.3775/jie.87.840
Self-citationAL-ARD, I. C., RAGAB, M., & MOHAMMED, A. T. (2009) · Journal of university of Anbar for pure science · doi:10.37652/juaps.2009.15620
- Authors
- IHARA, K., UEDA, H., SUE, K., NONAKA, T., & ARAI, K.
- Affiliations
- J-Power (Japan) (JP)
- Nihon University (JP)
- Tohoku University (JP)
- ORCID
- SUE, Kiwamu
- Venue
- Journal of the Japan Institute of Energy
- Publisher
- The Japan Institute of Energy
- Published
- 2006
- Volume
- 85
- Issue
- 2
- Pages
- 126-134
- ISSN
- 0916-8753 (ISSN-L)
- 1882-6121
- OpenAlex
- W2333697811
- Cited by
- 8
- References
- 0
- Citations by year
- 2024: 1 · 2023: 1 · 2021: 2 · 2020: 1 · 2015: 1
- FWCI
- 0.51
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of the Japan Institute of Energy (publishedVersion)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Subcritical and Supercritical Water Processes
- Physical Sciences › Engineering › Biomedical Engineering › Phase Equilibria and Thermodynamics
- Physical Sciences › Engineering › Computational Mechanics › Heat transfer and supercritical fluids
- Keywords
- sodium thiosulfate, sodium thiocyanate, supercritical water, decomposition kinetics, pseudo-first-order rate constant, coal gasification, gas purification, sulfite, sulfate, sulfide, reaction pathways, continuous flow reactor
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