Method to Determine MgO and MgOHCl in Chloride Molten Salts

Noah Klammer; Chaiwat Engtrakul; Youyang Zhao; Judith Vidal; Yilin Wu

doi:10.1021/acs.analchem.9b04301

Method to Determine MgO and MgOHCl in Chloride Molten Salts

Noah Klammer, Chaiwat Engtrakul, Youyang Zhao, Judith Vidal, Yilin Wu

Research output: Contribution to journal › Article › peer-review

17 Scopus Citations

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 °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.

Original language	American English
Pages (from-to)	3598-3604
Number of pages	7
Journal	Analytical Chemistry
Volume	92
Issue number	5
DOIs	https://doi.org/10.1021/acs.analchem.9b04301 https://doi.org/10.1021/acs.analchem.9b04301
State	Published - 3 Mar 2020

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

NREL Publication Number

NREL/JA-5500-73655

Keywords

concentrated solar power
high temperature
MgCl2
MgO
MgOHCl
thermal energy storage

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title = "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 °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.",

keywords = "concentrated solar power, high temperature, MgCl2, MgO, MgOHCl, thermal energy storage",

author = "Noah Klammer and Chaiwat Engtrakul and Youyang Zhao and Judith Vidal and Yilin Wu",

note = "Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",

year = "2020",

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doi = "10.1021/acs.analchem.9b04301",

language = "American English",

volume = "92",

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T1 - Method to Determine MgO and MgOHCl in Chloride Molten Salts

AU - Klammer, Noah

AU - Engtrakul, Chaiwat

AU - Zhao, Youyang

AU - Vidal, Judith

AU - Wu, Yilin

PY - 2020/3/3

Y1 - 2020/3/3

N2 - 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 °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.

AB - 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 °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.

KW - concentrated solar power

KW - high temperature

KW - MgCl2

KW - MgO

KW - MgOHCl

KW - thermal energy storage

UR - http://www.scopus.com/inward/record.url?scp=85080082417&partnerID=8YFLogxK

U2 - 10.1021/acs.analchem.9b04301

DO - 10.1021/acs.analchem.9b04301

M3 - Article

C2 - 32073829

AN - SCOPUS:85080082417

SN - 0003-2700

VL - 92

SP - 3598

EP - 3604

JO - Analytical Chemistry

JF - Analytical Chemistry

IS - 5

ER -

Method to Determine MgO and MgOHCl in Chloride Molten Salts

Abstract

Bibliographical note

NREL Publication Number

Keywords

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