A new solvent system: Hydrothermal molten salt

In a new report on Science Advances, T. Voisin and a research team in the Scientific Research National Center and the Institute of Technology and Energy Management in France, proposed a new solvent system. The hydrothermal molten salt (HyMoS) system, is composed of a molten salt in pressurized water and is able to change the solubility of inorganics in supercritical water. The scientists used sodium hydroxide (NaOH); a low melting temperature salt, and showed the ability to precipitate it at a temperature above its melting point, to instantly form HyMoS. The molten salt could then dissolve a large amount of inorganic salt including sodium sulfate (Na2SO4). The solvent system opens a new path in diverse fields including materials synthesis, biomass conversion, green chemistry, recycling, catalysis and sustainable manufacture. The work offers opportunities beyond hydrothermal dynamics to investigate the chemistry and insights of innovative salt precipitation.

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