Thermochemistry of ionic liquid heat-transfer fluids
Top Cited Papers
- 15 December 2004
- journal article
- Published by Elsevier BV in Thermochimica Acta
- Vol. 425 (1-2), 181-188
- https://doi.org/10.1016/j.tca.2004.11.013
Abstract
Large-scale solar energy collectors intended for electric power generation require a heat-transfer fluid with a set of properties not fully met by currently available commercial materials. Ionic liquids have thermophysical and chemical properties that may be suitable for heat transfer and short heat term storage in power plants using parabolic trough solar collectors. Ionic liquids are salts that are liquid at or near room temperature. Thermal properties important for heat transfer applications are melting point, boiling point, liquidus range, heat capacity, heat of fusion, vapor pressure, and thermal conductivity. Other properties needed to evaluate the usefulness of ionic liquids are density, viscosity and chemical compatibility with certain metals. Three ionic liquids were chosen for study based on their range of solvent properties. The solvent properties correlate with solubility of water in the ionic liquids. The thermal and chemical properties listed above were measured or compiled from the literature. Contamination of the ionic liquids by impurities such as water, halides, and metal ions often affect physical properties. The ionic liquids were analyzed for those impurities, and the impact of the contamination was evaluated by standard addition. The conclusion is that the ionic liquids have some very favorable thermal properties compared to targets established by the Department of Energy for solar collector applications.Keywords
This publication has 12 references indexed in Scilit:
- Thermal stability of low temperature ionic liquids revisitedThermochimica Acta, 2003
- Viscosity and Density of 1-Alkyl-3-methylimidazolium Ionic LiquidsPublished by American Chemical Society (ACS) ,2002
- A short history of ionic liquids—from molten salts to neoteric solventsGreen Chemistry, 2002
- Thermal properties of imidazolium ionic liquidsThermochimica Acta, 2000
- Influence of chloride, water, and organic solvents on the physical properties of ionic liquidsPublished by Walter de Gruyter GmbH ,2000
- The phase behaviour of 1-alkyl-3-methylimidazolium tetrafluoroborates; ionic liquids and ionic liquid crystalsJ. Chem. Soc., Dalton Trans., 1999
- Classical temperature-modulated calorimetry: A reviewThermochimica Acta, 1997
- Densities, molar volumes, and thermal expansivities of 1-methyl-3-ethylimidazolium chloride + aluminum chloride + alkali-metal halide molten saltsJournal of Chemical & Engineering Data, 1994
- Properties of 1,3-dialkylimidazolium chloride-aluminum chloride ionic liquids. 2. Phase transitions, densities, electrical conductivities, and viscositiesThe Journal of Physical Chemistry, 1984
- Dialkylimidazolium chloroaluminate melts: a new class of room-temperature ionic liquids for electrochemistry, spectroscopy and synthesisInorganic Chemistry, 1982