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Supercritical Extraction of Lanthanide Tributyl Phosphate Complexes: Current Status and Future Directions
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-05-22 , DOI: 10.1021/acs.iecr.9b01193 L. K. Sinclair 1 , J. W. Tester 2 , J. F. H. Thompson 3 , R. V. Fox 4
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-05-22 , DOI: 10.1021/acs.iecr.9b01193 L. K. Sinclair 1 , J. W. Tester 2 , J. F. H. Thompson 3 , R. V. Fox 4
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Many researchers have studied the extraction of lanthanides with tributyl phosphate in supercritical carbon dioxide. Potential applications include the enhanced extraction or separation of lanthanides from ores and recycled materials by making use of the unique solvation properties of supercritical CO2. In some cases, tributyl phosphate has been used to extract lanthanides from their solid nitrate salt form or from nitrate solutions. In other cases, tributyl phosphate/nitric acid adducts have been used to extract lanthanides from oxides, hydroxides, ores, phosphors, magnets, and waste batteries. Flow-through-type experiments have been useful for measuring extraction kinetics for various lanthanide-containing materials. Equilibrium -type experiments have helped to show the effect of different parameters on phase equilibria, often making use of spectroscopy to measure supercritical lanthanide concentrations in situ. Several studies have noted that extraction decreases when more water is added to the system; this is likely due to the condensation of aqueous droplets, which segregate lanthanides and thus inhibit extraction. It is proposed that varying degrees of water dissolution account for the inconsistent effect of pressure or temperature on extraction across various studies.
中文翻译：
超临界萃取镧系磷酸三丁酯配合物的现状和未来方向
许多研究人员已经研究了在超临界二氧化碳中用磷酸三丁酯萃取镧系元素。潜在的应用包括通过利用超临界CO 2的独特溶剂化特性，增强从矿石和再生材料中萃取或分离镧系元素的能力。。在某些情况下，磷酸三丁酯已用于从其固态硝酸盐形式或硝酸盐溶液中提取镧系元素。在其他情况下，磷酸三丁酯/硝酸加合物已用于从氧化物，氢氧化物，矿石，磷光体，磁体和废电池中提取镧系元素。流通型实验可用于测量各种含镧系元素的材料的萃取动力学。平衡型实验有助于显示不同参数对相平衡的影响，通常利用光谱法现场测量超临界镧系元素的浓度。几项研究表明，当向系统中添加更多的水时，提取量会减少。这可能是由于水滴的凝结而使镧系元素分离，从而抑制了萃取。
更新日期：2019-05-23
中文翻译：
超临界萃取镧系磷酸三丁酯配合物的现状和未来方向
许多研究人员已经研究了在超临界二氧化碳中用磷酸三丁酯萃取镧系元素。潜在的应用包括通过利用超临界CO 2的独特溶剂化特性，增强从矿石和再生材料中萃取或分离镧系元素的能力。。在某些情况下，磷酸三丁酯已用于从其固态硝酸盐形式或硝酸盐溶液中提取镧系元素。在其他情况下，磷酸三丁酯/硝酸加合物已用于从氧化物，氢氧化物，矿石，磷光体，磁体和废电池中提取镧系元素。流通型实验可用于测量各种含镧系元素的材料的萃取动力学。平衡型实验有助于显示不同参数对相平衡的影响，通常利用光谱法现场测量超临界镧系元素的浓度。几项研究表明，当向系统中添加更多的水时，提取量会减少。这可能是由于水滴的凝结而使镧系元素分离，从而抑制了萃取。
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