Structure of supercritical CO2 between 30 and 70°C for pressure between 70 and 180 bar
SuperCritical fluids based on CO2 have become increasingly used in many industrial sectors as they can be employed for extraction, impregnation of solids inorganic), particle coating, foaming, textile and paper dyeing,… Even the properties of the SC-CO2 such as compressibility, heat capacity, viscosity, thermal conductivity, are well known, its structural features remain very scarce for temperature between 30 and 70°C under pressure between 70 and 180 bar (corresponding to the region, roughly, just above the critical point). Several properties in that temperature-pressure region could be explained referring to a description based on a 'gas+liquid emulsion structure';. The goal of the project is to: - characterised this 'gas+liquid emulsion structure' through the acquisition of systematic data in the P-T region mentioned above, - to define the size and relative proportion of gas and liquid domains and to evaluate the mean distance within the gas and the liquid domains, - and then, to define a relation linking the portion and the relative size of the gas and liquid domains in the CO2 supercritical state as a function of temperature and pressure.
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Saint-Antonin; BLANCHOT Olivier; CRISTIGLIO Viviana; CUELLO Gabriel; GEBEL Gerard; Lebaigue O. and PONCELET Olivier. (2019). Structure of supercritical CO2 between 30 and 70°C for pressure between 70 and 180 bar. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-02-591
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