Abstract
Supercritical water (SCW: T > 374.15 °C, P > 22.1 MPa) possesses specially physical and chemical properties such as high diffusivity, low viscosity, low dielectric constant, and a small amount of hydrogen bonds. Organic matter and oxygen can be dissolved in SCW with any ratio under high enough pressure condition while the solubility of inorganic salt in SCW is extremely low. Therefore, these properties are beneficial to reduce resistance of mass and heat transfer and to separate salts from SCW. As an attractive media for regulating chemical reaction process and performing salt separation process, SCW has attracted more attentions since the early 1980s. The definition of supercritical water oxidation (SCWO) is that the organic matter is oxidized into harmlessly small molecular compounds such as carbon dioxide, nitrogen, water, and inorganic salt by excess oxidant in SCW. Supercritical water gasification (SCWG) means that organic matter undergoes hydrolysis, pyrolysis reaction and so on in SCW to form a hydrogen-rich mixing gas.
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Wang, S. et al. (2020). Study on Key Technologies of Supercritical Water Gasification/Oxidation. In: Supercritical Water Processing Technologies for Environment, Energy and Nanomaterial Applications. Springer, Singapore. https://doi.org/10.1007/978-981-13-9326-6_8
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DOI: https://doi.org/10.1007/978-981-13-9326-6_8
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