2019 Volume 29 Issue 3 Pages 206-216
In our research group, resource conversion processes in high pressure solutions focusing on hydrothermal or ionic liquid as reaction and separation fields have been discussed. Specifically, we have examined kinetic study about enhancement of functionality and addition of higher value by breaking into low molecular weight materials from biomass using high pressure and high temperature water as solvent. For hydrothermal systems, our research groups have studied active control for pH in solutions as reaction controlling factors and utilization of solid acid/base. Additionally, development of recycling technique of positive-electrode material in lithium-ion batteries using function of organic acid in hydrothermal fields. For ionic liquid systems, our research group have studied extraction of reaction products and viscosity reduction effect for ionic liquid solution by adding CO2. Recently, physical properties of mixed ionic liquid systems which contain two or more ionic liquids have been measured and predicting method for them have been assessed. In this review, the results focusing on our research are overviewed, current research trends are introduced, and perspectives are discussed.
