Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate

doi:10.1021/acsomega.0c00583

	Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate
	Tan, Boren 1,2; Chang, Chao 2; Xu, Dongbing 2; Wang, Yong 2; Qi, Tao 2
刊名	ACS OMEGA
	2020-06-02
卷号	5 期号:21 页码:12174-12183
ISSN号	2470-1343
DOI	10.1021/acsomega.0c00583
英文摘要	Uranium is a strategic element and plays an important role in energy resources. A H2O-HNO3-UO2(NO3)(2)-TBP (tri-n-butyl phosphate)-diluent system is commonly used for uranium separation and purification in liquid-liquid extraction. Uranyl nitrate is promoted by the existence of nitrate at low HNO3 concentrations but is inhibited at high HNO3 concentrations. Considering the competitive extraction between HNO3 and UO2(NO3)(2), a generic extraction model is developed. The activities of components in the aqueous phase were estimated using Pitzer models. The thermodynamic equilibrium constants and Pitzer parameters were regressed by experimental data. The resulting model was able to successfully predict uranyl nitrate, nitric acid, and water extraction over a large range of conditions (U, 0-1.8 mol/L; HNO3, 0-10 mol/L; TBP, 5-100 vol %) within average absolute relative deviations of 11.2, 15.7, and 23.8%, respectively. The predicted results show that water and nitric acid were extracted as di-solvates HNO3 center dot(TBP)(2)center dot H2O and (TBP)(2)center dot 2H(2)O at low nitric acid concentrations, with the formation of mono-solvates HNO3 center dot TBP and HNO3 center dot TBP center dot H2O as the acid concentration increased. Uranyl nitrate was shown to be rejected from the organic phase as the formation of HNO3 center dot TBP and HNO3 center dot TBP center dot H2O in acid was extracted at high acid concentrations.
资助项目	Science and Technology Service Network Initiative[KFJ-STS-QYZD-081] ; National Key R&D Program of China[2019YFC1907700]
WOS关键词	TRIBUTYL-PHOSPHATE ; ACTIVITY-COEFFICIENTS ; AQUEOUS-SOLUTIONS ; CHEMICAL-MODEL ; WATER ; SYSTEM ; EQUILIBRIA ; SOLVENT ; DILUENT ; TBP
WOS研究方向	Chemistry
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000538419300034
资助机构	Science and Technology Service Network Initiative ; National Key R&D Program of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/41121]
专题	中国科学院过程工程研究所
通讯作者	Wang, Yong; Qi, Tao
作者单位	1.Univ Chinese Acad Sci, Beijing 101400, Peoples R China 2.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100089, Peoples R China
推荐引用方式 GB/T 7714	Tan, Boren,Chang, Chao,Xu, Dongbing,et al. Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate[J]. ACS OMEGA,2020,5(21):12174-12183.
APA	Tan, Boren,Chang, Chao,Xu, Dongbing,Wang, Yong,&Qi, Tao.(2020).Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate.ACS OMEGA,5(21),12174-12183.
MLA	Tan, Boren,et al."Modeling of the Competition between Uranyl Nitrate and Nitric Acid upon Extraction with Tri-n-butyl Phosphate".ACS OMEGA 5.21(2020):12174-12183.