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Study on the Extraction Properties of Uranium (Ⅵ ),thorium (Ⅳ ) in Solution Using Db18c6- Ethyl Acetate System

Author: XuLiHua
Tutor: YuanYaLi
School: Nanhua University
Course: Analytical Chemistry
Keywords: Dibenzo-18 - crown - 6 Extraction Ethyl acetate Uranium ( VI ) Thorium ( IV ) Salicylic acid Salting agent Thinner
CLC: O621.2
Type: Master's thesis
Year: 2010
Downloads: 77
Quote: 0
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Abstract


Chapter 1: a brief introduction to the coordination of the crown ether compounds, including good coordination ability of crown ethers, unique ligand selectivity and impact of crown ethers with the physical stability and selectivity factor (ligand, yin and yang kind of ions and solvent), briefly the extractant research progress of the crown ether metal ion separation and uranium (VI). Finally, the significance of research on the subject and summarized and concluded. Chapter 2: Dibenzo-18 - crown-6 as extractant investigated a variety of thinner, salting and organic media dibenzo - 18 - crown -6 extraction of uranium (VI) to determine ethyl acetate as a diluent, 0.1mol / L of KH2PO4 for the salting-out agent, and salicylic acid as the acidic medium of the solvent extraction system. The apparent equilibrium constant and thermodynamic functions of the extraction system under selected conditions, 1 × 10-4mol / L of uranium (VI) extraction rate of up to 82.5%, and calculate the extraction reaction. Chapter 3: established dibenzo - 18 - crown - 6 - ethyl acetate extraction system of uranium (VI) based on depth study of the system back extraction organic phase after the extraction of uranium (VI). Compare a variety of uranium (VI) reagents in organic phase stripping rate, screened satisfactory stripping agent, to obtain a better stripping ratio. Reextracted acidity, concentration, temperature and other conditions are discussed. Chapter 4: salicylic acid medium, dibenzo-18 - crown-6 as extractant extraction solution of uranium (VI) ion extraction process Dibenzo-18 - crown - 6 of uranium (VI) ion coordination reaction. Water phase after phase separation, the organic phase was eluted drying, recrystallization, elemental analysis, and were characterized by means of infrared, TGA, speculated Dibenzo-18 - crown - 6 of uranium (VI) complexes The matter may be composed of: {[UO2 (DB18C6)] (NO3) (C7H5O3)} · 2H2O. Chapter 5: thorium, uranium belong to actinides, this chapter based on the similarity of uranium (VI) and thorium (IV) the nature, with dibenzo-18 - crown-6 as extractant, ethyl acetate as diluent, KH2PO4 salting agent, salicylic acid is the acidic medium of the extraction system for extraction separation of thorium (IV) solution. In selected experimental conditions applied to the determination of simulated samples of 1 × 10-4mol / L thorium (IV) ion extraction rate of 88.5%. And calculate the apparent equilibrium constant of the extraction reaction and thermodynamic functions.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Properties of organic compounds
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