期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 152, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.supflu.2019.104567
关键词
SCWO; Supercritical water; Salt precipitation; Multiphasic systems; Solubility
资金
- INNOVEOX Company
- French Environment and Energy Management Agency (ADEME)
- French Region Nouvelle Aquitaine
Supercritical water oxidation processes (SCWO) have been developed as an alternative technology to treat toxic and/or complex chemical wastes with a very good efficiency. However, one main limitation of the SCWO process comes from the precipitation of inorganic compounds. When dealing with supercritical water conditions (T >= 374 degrees C, p >= 22.1 MPa), the polarity of water drops and inorganics, such as salts, are no longer soluble. This precipitation phenomenon results in a solid salt deposition in the reactor, which can lead to clogging and interruption of the continuous process. Considering a specific salt, beside its intrinsic solubility in supercritical water, the presence of other salts or other compounds in the media can modify its precipitation behaviour. With the use of a specific experimental set-up, we propose in the present work to study the solubility of NaCl (type I salt) in supercritical water, and the influence of its phase diagram on its precipitation behaviour as well as on the solubility of a second salt, Na2SO4 (type II salt). The complex and dynamic aspect of NaCl precipitation has been studied through the use of a continuous solubility measurement set-up, revealing unexpected results. (C) 2019 Elsevier B.V. All rights reserved.
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