Supercritical water desalination (SCWD) of multi-component brines

被引：3

作者：

van Wyk, Surika ^{[1
,2
]}

van der Ham, Aloijsius G. J. ^{[1
]}

Kersten, Sascha R. A. ^{[1
]}

机构：

[1] Univ Twente, Sustainable Proc Technol, Fac Sci & Technol, Postbus 217, NL-7500 AE Enschede, Netherlands

[2] European Ctr Excellence Sustainable Water Technol, Wetsus, Oostergoweg 9, NL-8911 MA Leeuwarden, Netherlands

来源：

JOURNAL OF SUPERCRITICAL FLUIDS | 2022年 / 188卷

基金：

欧盟地平线“2020”;

关键词：

Supercritical water desalination (SCWD); Multi-component brines; Phase equilibria; Thermodynamic modelling; CONTINUOUS SALT PRECIPITATION; SYNTHETIC FLUID INCLUSIONS; THERMODYNAMIC-PTX ANALYSIS; OF-STATE REPRESENTATION; SOLID-LIQUID EQUILIBRIA; PHASE-EQUILIBRIA; SODIUM-SULFATE; SYSTEM NACL-KCL-H2O; VOLUMETRIC PROPERTIES; HYPERSALINE BRINES;

D O I：

10.1016/j.supflu.2022.105687

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The phase behaviour of two model multi-component salt-water mixtures (NaCl-KCl-H2O and NaCl-Na2SO4-H2O) was investigated for the application of supercritical water desalination (SCWD). The experimental investigation was a two-step procedure starting with qualitative analysis followed by quantitative measurements. The qualitative experiments served as a screening step to visually inspect phase behaviour. The quantitative results for NaCl-KCl-H2O, showed similarities in phase behaviour between the salts, which led to the assumption that the ternary mixture behaved as an ideal mixture between two binary solutions. The ternary equilibrium concentrations in the SCW phase could therefore be predicted using the binary salt-water models of the respective salts and accounting for the feed concentrations. Based on the quantitative results for NaCl-Na2SO4-H2O, the phase behaviour of the mixture was divided into three regions. The third region was the suitable region for SCWD, as the precipitated salts (Na2SO4) dissolved in the hydrothermal brine (NaCl), forming a vapour-liquid equilibrium.

引用

页数：11