首页|Directional amine-based solvent extraction for simulta-neous enhanced water recovery,salt separation and effective descaling from hypersaline brines
Directional amine-based solvent extraction for simulta-neous enhanced water recovery,salt separation and effective descaling from hypersaline brines
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The feasibility of simultaneous water recovery,salt separation and effective descaling of hypersaline brine was investigated by diisopropylamine(DIPA)-based directional solvent extraction(DSE),using diluted/concentrated seawater with initial saline concentration range of 12-237 g/L at extraction temperatures of 5 and 15 ℃,respectively.The water recovery shows an obvious boundary at saline concentration of 115 g/L under dual effect of specific water extraction efficiency and extraction cycles.High Cl-ion concentration in product water is in sharp contrast to the nearly complete removal of SO42-and hardness ions,indicating that DIPA-based DSE process indeed achieved efficient separation and purification of Cl-ion from hypersaline brines.Especially,the radical precipitation of Mg2+and Ca2+ions in form of Mg(OH)2 and CaCO3 demonstrates effective descaling potential,although it leads to more DIPA residues in dewatered raffinate than product water.Moreover,an exponential correlation between the Cl-removal efficiency and specific water extraction efficiency further reveals the intrinsic relationship of water extraction process and transfer of Cl-ion to the product water.Overall,the study provides a novel approach for integrating the water recovery and separation of Cl-ion from ultra-high-salinity brines with radical precipitation of Mg2+and Ca2+ions in one step.
Hypersaline brinesDirectional solvent extractionSalt separationCa2+ and Mg2+ descaling
Yuyao Zhang、Litao Jia、Jin Zhao、Xuming Liu、Shuyu Dong、Chuanyang Liu、Yuanyuan Cui
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Shougang Research Institute of Technology,Beijing 100043,China
Research Center of Environmental Technology in Water Pollution Source Identification and Precise Supervision,School of Environment,Tsinghua University,Beijing 100084,China
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