以酸性萃取劑萃取稀土金屬銪(III)與鏑(III)之研究

A Study on the Extraction Equilibria of the Europium (III) and Dysprosium (III) with Acidic Extractants

邱柏傑(Po-Chieh Chiu)

指導教授 ： 蔡德華

國立臺北科技大學/工程學院/化學工程研究所/碩士(2013年)

摘要

本論文是在探討利用酸性萃取劑二(2-乙基己基)磷酸(D2EHPA)，在25 ℃定溫下以煤油(Kerosene)為稀釋劑，分別探討萃取氯化銪、氯化鏑個別水溶液以及氯化銪、氯化鏑混合水溶液中銪(III)和鏑(III)之萃取平衡實驗，藉此所得的萃取平衡數據，探討反萃所需pH值、萃取劑濃度、陰離子濃度等因素對萃取反應的影響。
由實驗數據得知，以酸性萃取劑D2EHPA萃取氯化銪和氯化鏑個別溶液以及氯化銪氯化鏑混和溶液平衡實驗中，銪和鏑在有機相和水溶液相間萃取分配比會隨酸性萃取劑濃度和pH值的增加而增大，且經圖解分析法得知萃合物組成。

關鍵字

萃取 ； 二(2-乙基己基)磷酸 ； 銪(III) ； 鏑(III)

並列摘要

In this study, the equilibrium of the separation of Europium(III) and Dysprosium(III) by solvent extraction methods were investigated at 25°C；meanwhile, the acidic extractants D2EHPA was used. It began with the extraction equilibrium of Europium (III) and Dysprosium (III) in extractants-kerosene solution and extractants-aqueous solution, and eventually the mixed Europium (III) and Dysprosium (III)extractants-aqueous solutionwas studied.
The experimental results indicated that the distribution coefficients for the extraction ofEuropium(III) and Dysprosium(III)increased with either of rising concentrations of extractant in the organic phase or equilibrium pH values in the aqueous phase. Moreover we could realize the composition of the extractants throughthe graphical and numerical analysis.
The composition of EuCl3/D2EHPA complex formed in the organic phase were found to be EuA3(HA)和EuA3(HA)2, and at the same time the respective corresponding equilibrium constants were KEu31 = 0.76 kmol/m3、KEu32 = 0.58 (kmol/m3)0.5 ; The composition of DyCl3/D2EHPA complex formed in the organic phase were found to be DyA3(HA)、DyA3(HA)2, and furthermore the respective corresponding equilibrium constants were KDy31 = 10.03 kmol/m3、KDy32 = 24.54 (kmol/m3)0.5.
The composition of EuCl3、DyCl3/D2EHPA complex formed in the organic phase were found to be EuA3(HA)、EuA3(HA)2；DyA3(HA)、DyA3(HA)2, and simultaneously the respective corresponding equilibrium constants were KEu31 = 0.65 kmol/m3、KEu32 = 1.41 (kmol/m3)0.5；KDy31 = 1.26 kmol/m3和KDy32 = 28.79 (kmol/m3)0.5；separation factor：α_DyEu=21.28[(H_2 A_2 ) ‾]^0.28

並列關鍵字

Extraction ； Di(2-ethylhexyl) phosphoric acid ； Europium(III) ； Dysprosium(III)

參考文獻

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