Method To Determine MgO and MgOHCl in Chloride Molten Salts
Abstract
A commercial blend of mainly carnallite (KCl∙MgCl2∙6H2O) is considered as a next-generation heat transfer fluid in solar thermal plants. Corrosive properties of MgCl2 hydrates must be addressed at the operating temperatures of 500-720 degrees C. For successful chemical monitoring of the carnallite heat transfer fluid, an experimental method was developed to separate and titrate for MgO and MgOHCl from solid carnallite. This new method was assessed for error and accuracy. The method's relative error for MgOHCl was -7.0% for a mass fraction of 9.0 wt % MgOHCl in the carnallite salt. The method's relative error for MgO was less than +1.0% for a mass fraction of 12.0 wt % MgO in the carnallite salt. Titration results were used to track changes in the MgOHCl concentration in carnallite salt through the carnallite's dehydration and purification.
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1602691
- Report Number(s):
- NREL/JA-5500-73655
Journal ID: ISSN 0003-2700
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Analytical Chemistry
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 5; Journal ID: ISSN 0003-2700
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; 47 OTHER INSTRUMENTATION; MgCl2; thermal energy storage; concentrated solar power; MgOHCl; MgO; high temperature
Citation Formats
Klammer, Noah, Engtrakul, Chaiwat, Zhao, Youyang, Wu, Yilin, and Vidal, Judith C. Method To Determine MgO and MgOHCl in Chloride Molten Salts. United States: N. p., 2020.
Web. doi:10.1021/acs.analchem.9b04301.
Klammer, Noah, Engtrakul, Chaiwat, Zhao, Youyang, Wu, Yilin, & Vidal, Judith C. Method To Determine MgO and MgOHCl in Chloride Molten Salts. United States. https://doi.org/10.1021/acs.analchem.9b04301
Klammer, Noah, Engtrakul, Chaiwat, Zhao, Youyang, Wu, Yilin, and Vidal, Judith C. Wed .
"Method To Determine MgO and MgOHCl in Chloride Molten Salts". United States. https://doi.org/10.1021/acs.analchem.9b04301. https://www.osti.gov/servlets/purl/1602691.
@article{osti_1602691,
title = {Method To Determine MgO and MgOHCl in Chloride Molten Salts},
author = {Klammer, Noah and Engtrakul, Chaiwat and Zhao, Youyang and Wu, Yilin and Vidal, Judith C.},
abstractNote = {A commercial blend of mainly carnallite (KCl∙MgCl2∙6H2O) is considered as a next-generation heat transfer fluid in solar thermal plants. Corrosive properties of MgCl2 hydrates must be addressed at the operating temperatures of 500-720 degrees C. For successful chemical monitoring of the carnallite heat transfer fluid, an experimental method was developed to separate and titrate for MgO and MgOHCl from solid carnallite. This new method was assessed for error and accuracy. The method's relative error for MgOHCl was -7.0% for a mass fraction of 9.0 wt % MgOHCl in the carnallite salt. The method's relative error for MgO was less than +1.0% for a mass fraction of 12.0 wt % MgO in the carnallite salt. Titration results were used to track changes in the MgOHCl concentration in carnallite salt through the carnallite's dehydration and purification.},
doi = {10.1021/acs.analchem.9b04301},
journal = {Analytical Chemistry},
number = 5,
volume = 92,
place = {United States},
year = {Wed Feb 19 00:00:00 EST 2020},
month = {Wed Feb 19 00:00:00 EST 2020}
}
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