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首页> 外文期刊>The Journal of Supercritical Fluids >Extraction of lanthanide ions from aqueous solution by modified supercritical CO_2: tri-n-butylphosphate + CO_2 and bis-2-ethylhexyl phosphoric acid + CO_2
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Extraction of lanthanide ions from aqueous solution by modified supercritical CO_2: tri-n-butylphosphate + CO_2 and bis-2-ethylhexyl phosphoric acid + CO_2

机译：改性超临界CO_2：磷酸三正丁酯+ CO_2和双-2-乙基己基磷酸+ CO_2从水溶液中萃取镧系离子

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摘要

High-pressure single-phase limit of binary tri-n-butylphosphate (TBP) + CO_2 and bis-2-ethylhexyl phosphoric acid (B2EHPA) + CO_2 was measured. By a variable-volume view-cell apparatus, the phase transition pressures of each system were measured at various phase-equilibrium conditions (313.15-333.15 K, 10-25 MPa, 3.7-18.9 mol% TBP and 1.0-45.0 mol% B2EHPA). Based on this data, supercritical fluid extraction (SFE) was carried out for lanthanide ions from acidic aqueous solution. In the first place, SFE was carried out for Nd~(3+) over a wide range of conditions (0-5 M HNO_3, 313.15-333.15 K and 10-25 MPa) and optimum SFE process conditions are evaluated. In the second place, SFE was carried out at 313.15 K and 25 MPa for six types of lanthanide ions (La~(3+), Ce~(3+), Nd~(3+), Sm~(3+), Eu~(3+), and Yb~(3+)) from 1 M HNO_3 acidic solution and the characteristics of different metals on the SFE were compared.
机译：测量了磷酸三正丁酯（TBP）+ CO_2和双-2-乙基己基磷酸（B2EHPA）+ CO_2的高压单相极限。通过可变体积视单元设备，在各种相平衡条件下（313.15-333.15 K，10-25 MPa，3.7-18.9 mol％TBP和1.0-45.0 mol％B2EHPA）测量每个系统的相变压力。 。基于此数据，对酸性水溶液中的镧系元素离子进行了超临界流体萃取（SFE）。首先，在很宽的条件范围（0-5 M HNO_3、313.15-333.15 K和10-25 MPa）下对Nd〜（3+）进行SFE，并评估了最佳SFE工艺条件。其次，对六种镧系离子（La〜（3 +），Ce〜（3 +），Nd〜（3 +），Sm〜（3+），比较了1 M HNO_3酸性溶液中的Eu〜（3+）和Yb〜（3+））以及SFE上不同金属的特性。

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