Process for separation of technetium from alkaline low level waste using di-tert-butyldibenzo-18-crown-6+isodecyl alcohol/n-dodecane solvent

被引：14
作者：
Sharma, J. N. [1 ,2 ]
Sinharoy, Prithwish [1 ]
Kharwandikar, B. [1 ]
Thorat, Vidya S. [1 ]
Tessy, V [1 ]
Kaushik, C. P. [1 ]
机构：
[1] Bhabha Atom Res Ctr, Nucl Recycle Grp, Bombay 400085, Maharashtra, India
[2] Homi Bhabha Natl Inst, Bombay 400094, Maharashtra, India
来源：
SEPARATION AND PURIFICATION TECHNOLOGY | 2018年 / 207卷
关键词：
Technetium; Pertechnetate; Di-tert-butyldibenzo-18-crown-6; Extraction; LLW; RHENIUM; TC-99;
D O I：
10.1016/j.seppur.2018.04.058
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Di-tert-butyldibenzo-18-crown-6 ether (CE) dissolved in a mixture of isodecyl alcohol and n-dodecane has been investigated for separation of technetium from alkaline low level waste (LLW). Technetium present as TcO4- pairs with sodium ion-crown ether complex formed due to high sodium nitrate concentration in the waste solution results in extraction of TcO4- by ion-pair formation of the kind Na+.CE.TcO4-. Stoichiometry of the extracted complex as determined by slope analysis of log-log plot of technetium distribution ratio (D-Tc) vs. the CE concentration suggests a combining ratio of 1 TcO4- to 1 CE. Extraction of TcO4- was examined from aqueous phase with varying NaNO3 and NaOH concentrations. DT, was found to increase with increase in Na+ concentration having NO3- or OH- as counter ions, however, above 5 M concentrations of them, Drc remained constant for NaOH while it decreases for NaNO3 due to a strong competitive extraction of NO3- ion compared to OH-. Quantitative stripping of TcO4- was achieved in three consecutive contact of loaded organic with deionized water.
引用
收藏
页码：416 / 419
页数：4
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