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nPr-BTP/nitrobezene 추출 계에 의한 악티나이드(III)의 선택적 분리
이일희,임재관,정동용,양한범,김광욱,Lee, Eil-Hee,Lim, Jae-Kwan,Chung, Dong-Yong,Yang, Han-Beom,Kim, Kwang-Wook 한국방사성폐기물학회 2008 방사성폐기물학회지 Vol.6 No.1
A selective separation of Actirlide(III) by a nPr-BTP/nitrobezene extraction system was studied. The nPr-BTP (2.6-Bis-(5.6-n-propyl-1.2.4-triazin-3-yl)-pyridine) of a environmentally -friendly CHN type was self-synthesized and its compatability with diluent and stability with nitric acid were investigated. At the 0.1M nPr-BTP/nitrobenzene-1M $HNO_3$ and O/A=2, extraction yields of Am used as a representative of Actinide(III) and Eu were about 85% and 8%, respectively, and the other RE elements such as Nd, Ce and Y were extracted less than 3% (separation factor of Am and Eu was about 60). Thus, there was no problems in the selective extraction of Actinide(III) from RE. The stripping yield of Am with 0.05M $HNO_3$ at O/A= 1, however, was about 43% and the maximum stripping yield was 65% at O/A=0.3. It is necessary to develop the stripping system including the stripping agent instead of nitric acid solution.
$(Zr-DEHPA)/n-dodecane-HNO_3$ 금속함유 추출 계에 의한 악티나이드(III)및 RE의 공추출 및 상호 분리
이일희,임재관,정동용,양한범,김광욱,Lee, Eil-Hee,Lim, Jae-Kwan,Chung, Dong-Yong,Yang, Han-Beom,Kim, Kwang-Wook 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.2
This study was performed to evaluate the co- and mutual separation for Am, Cm and RE elements from the simulated multi-component solution equivalent to real HLW level by a Zr-DEHPA(di-(2-ethylhexyl) phosphoric acid containing Zirconium)/$NDD(n-dodecane)-HNO_3$ extraction system. Zr-DEHPA was self-synthesized and the optimal condition of (15g/L Zr-1M DEHPA)/NDD-1M $HNO_3$ was selected taking into consideration of prevention of the third phase, and effects of concentration of DEHPA, nitric acid and impregnant amount of Zr on the co-extraction of Am, Cm and RE. In that condition, the extraction yields were 81% (Am), 85% (Cm), more than 80% (RE elements), 98% (Mo), 85% (Fe), 98% (U), 73% (Np), and less than 5% (other elements) so that the system developed for the co-extraction of Am-Cm/RE was proved to be available. For that, however, U, Np, Mo and Fe was elucidated to have to be removed in advance, and Zr inducing the third phase formation was found to be practically excluded. The co-extracted Am-Cm/RE were sequentially separated in an order of Am-Cm (stripping agent : 0.05 M DTPA-1M Lactic acid of pH 3.6)${\rightarrow}RE$ (stripping agent : 5M $HNO_3$), and then their separation factors were evaluated. At above conditions, Am of 65.4%, Cm of 63.9%, RE (except for Y) of more than 85% were stripped.
HEV 운전 특성 분석을 위한 MATLAB 시뮬레이터 개발
임덕영(Deokyoung Lim),임재관(Jae-kwan Im),최재호(Jaeho Choi),정교범(Gyo-Bum Chung) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
HEV 운전특성 연구를 위한 시뮬레이터에 사용되는 HEV 구성요소들의 모델링은, 연구 목적에 따라 크게 정상상태 모델과 동적모델로 분류할 수 있다. 정상상태 모델이 시스템의 구조해석과 포괄적인 운전 전략에 관한 툴이라면 동적모델은 각 구성요소의 특성과 손실에 관하여 더 자세한 정보를 제공한다. 본 논문은 HEV 운전 특성 분석을 위한 시뮬레이터에 사용하기 위한, Energy-based system model을 기반으로 한 정상상태 모델과 동적 모델을 제안한다.
TBP 추출제에 의한 Neptunium 의 산화 추출 거동
김광욱,박현수,권선길,유재형,이일희,임재관 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.6
TBP 추출제에 의한 Np의 추출률은 산화제의 첨가 여부에 관계 없이 질산 농도 증가에 따라 증가하였다. 산화제가 첨가되지 않은 경우 2 M 질산에서 약 12%가 추출되었으며, 4 M 질산에서는 불균등화 반응에 의거 약 56%가 추출되었다. 그러나 1 g/L의 NH₄VO₃산화제가 첨가된 경우는 Np(V)가 Np(VI)로 산화되어 2 M 질산에서도 약 75%가 추출되었다. 그리고 Np에 U이 단독으로 첨가된 경우 Np의 추출물은 U 농도 증가에 따라 감소하며, 10 g/L의 U 경우 약 66.3%가 추출되었다. 반면에 Zr의 경우 Zr의 농도 증가에 따라 88±2%가 추출되어 Zr의 농도에는 거의 영향이 없었으며, Np이 단독으로 존재할 때의 추출률인 75% 보다 약 13-15% 정도 증가되는 상승 효과를 보이고 있다. U과 Zr이 함께 공존하고 있는 경우 또한 Zr의 농도에는 거의 영향이 없었으나, U의 농도 증가에 따라 추출률이 감소하였다. U 농도가 5 g/L 이하에서는 Zr에 의한 상승 효과로 88±2%가 추출된 반면에, U의 농도가 10 g/L에서는 Zr에 의한 상승 효과와 U 농도 증가에 따른 감소 효과에 의해 82±1%가 추출되었다. 마지막으로 9성분계에서의 Np 및 U의 추출물은 각각 89%, 93%였고 기타 Zr, Fe, Mo, Y, Cs 및 Sr 등은 약 5% 미만이 추출되었다. The extraction yields of Np(E_(Np)) by solvent extraction with tributyl phosphate in n-dodecane(TBP/NDD) increased with concentration of HNO₃regardless of oxidant. Without oxidant, E_Np was about 12% at 2 M HNO₃and increased to 56% at 4 M HNO₃due to the disproportionation of Np(V) to Np(VI) and Np(IV). Adding the NH₄VO₃of 1 g/L, as a oxidant, E_(Np) was about 75% at 2 M HNO₃. This was attributable to the oxidation of Np(V) to Np(VI). In the presence of U or Zr, E_(Np) decreased with concentration of U and was about 66.3% at U of 10 g/L. On the other hand, E_(Np) had no effect with concentration of Zr and was in the range of 88±2%. It was found that E_(Np) adding Zr was more enhanced about 13-15% than that of Np only. In the presence of both U and Zr, E_(Np) also had no effect with concentration of Zr and slightly decreased with concentration of U. When U was less than 5 g/L, E_(Np)was in the range of 88±2% by the synergetic effect of Zr only. At U of 10 g/L, however, E_(Np) was 82±1% by the synergetic effect of Zr and decreasing effect of U. In the 9 components system containing the NH₄VO₃of 1 g/L, the extraction yields of Np and U were about 89% and 93%, respectively, and those of Fe, Mo, Zr, Y, Cs and Sr were below 5%. Therefore, Np and U could be effectively co-separated from the simulated HLW solution by controlling the oxidation state of Np.