Method To Determine MgO and MgOHCl in Chloride Molten Salts

Klammer, Noah; Engtrakul, Chaiwat; Zhao, Youyang; Wu, Yilin; Vidal, Judith C.

doi:10.1021/acs.analchem.9b04301

Method To Determine MgO and MgOHCl in Chloride Molten Salts

Journal Article · Wed Feb 19 04:00:00 EST 2020 · Analytical Chemistry

DOI:https://doi.org/10.1021/acs.analchem.9b04301· OSTI ID:1602691

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National Renewable Energy Lab. (NREL), Golden, CO (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1602691

Report Number(s):: NREL/JA--5500-73655

Journal Information:: Analytical Chemistry, Journal Name: Analytical Chemistry Journal Issue: 5 Vol. 92; ISSN 0003-2700

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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