• Bulletin of the Korean Chemical Society
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• 제32권9호
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• pp.3429-3432
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• 2011

Distribution diagram of $FeCl_2$ in HCl solution indicated that $FeCl^+$ was a predominant species in strong HCl solution up to 10 M. Solvent extraction of $FeCl_2$ has been performed in the HCl concentration range from 5 to 9 M by using Alamine336 as an extractant. Interaction parameter of $FeCl^+$ for Bromley equation was estimated from our solvent extraction data. This parameter thus obtained in our study can be employed in calculating the activity coefficient of $FeCl^+$ in high concentration of HCl.

• Bulletin of the Korean Chemical Society
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• 제30권7호
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• pp.1526-1530
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• 2009

Solvent extraction reaction of Zn(II) by Alamine336 from strong HCl solution up to 10 M was identified by analyzing the data reported in the literature. The equilibrium constant of this reaction was estimated by considering the complex formation between zinc and chloride ion. The necessary thermodynamic parameters, such as equilibrium constant for the formation of complexes and the interaction parameters, were evaluated from the thermodynamic data reported in the literature. The following solvent extraction reaction and the equilibrium constant was obtained by considering the activity coefficients of solutes present in the aqueous phase with Bromley equation. $Zn^{2+}\;2Cl^{-}\;+\;R_3NHCl_{org}\;=\;ZnCl_3R_3NH_{org},\;K_{ex}\;=\;6.33\;{\times}\;10^2$ There was a good agreement between measured and calculated distribution coefficients of Zn(II).

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.546-547
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• 2007

Magnesium is widely used as a lightweight alloy for car engine components and case of cellular phone. Extraction technologies of magnesium are divided to fused salt electrolysis process and thermal reduction process. In this study, electrolysis magnesium is prepared by fused salt electrolysis process with magnesium chloride. We compared two kinds of mixed salt at 7V. As a result, 47% of current efficiency was obtained by electrolyzing KCl/NaCl/$MgCl_2$ mixed salt bath at $760^{\circ}C$, and purity of the prepared magnesium was over 98%. With this study, we can scale up fused salt electrolysis device and accumulate basic data which will be needed for designing an electrolysis cell.

• Korean Chemical Engineering Research
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• 제55권4호
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• pp.503-509
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• 2017

The present experimental study proposed two ionic liquids (ILs) namely [Aliquat 336] [$HSO_4$] (prepared and characterized at our laboratory) and Cyphos 101 IL (supplied by Cytec Company) dissolved in two different diluents such as DCM (di-chloro-methane) and toluene applied for PMs extraction. The first IL [Aliquat 336] [$HSO_4$] prepared and confirmed the formation of final product by using FT-IR and TGA studies. The primary experiment in solvent extraction processing is kinetic effect; 0 to 30 time varied for PMs by using two ILs and confirmed the optimized extraction equilibrium time. This study was conducted for PMs (Pt, Rh and Cu) extraction and separation from each other by using proposed ILs. This is the primary study of the utilizing green solvents such as ILs as an extractant system for Pt, Rh and Cu extraction and possible separation.

• Membrane and Water Treatment
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• 제12권2호
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• pp.75-82
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• 2021

This study aimed to prepare a W/O nonionic microemulsion system(MEs) consisting of OP-4[polyoxyethylene(4) nonylphenol], OP-7[polyoxyethylene(7) nonylphenol], 1-hexanol, D2EHPA, kerosene and HCl solution and applied to the extraction of La(III) from chloride aqueous solution within the polysulfone hollow fiber contactor (HFC),laboratory-scale experiments were carried out to investigate the recovery of La(III) using as-prepared microemulsion from the simulation wastewater containing La(III),Al(III) and Fe(III). The right weight ratio(Rs) of OP-4 to OP-7 was firstly confirmed through determination of the solubilization capacity of HCl solution(W0,HCl) in microemulsion, the effect of several factors such as the HCl concentration, temperature and effective extraction time on the extraction efficiency of La(III) was discussed. Results showed that the acceptable Rs was 4:6 to prepare the W/O MEs. The extraction yield of La(III) increased with the increasing of HCl concentration, temperature and effective extraction time and reaches to 97.3% while using five-stage modules. The recovery yield of La(III) from simulation La-bearing wastewater was 90.6%.

• Korean Chemical Engineering Research
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• 제58권2호
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• pp.273-279
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• 2020

본 연구에서는 바이오매스로부터 파클리탁셀 회수를 위한 전통적 용매 추출(conventional solvent extraction, CSE), 마이크로웨이브를 이용한 추출(microwave-assisted extraction, MAE), 초음파를 이용한 추출(ultrasound-assisted extraction, UAE) 방법을 비교하였다. 추출 용매 종류(아세톤, 클로로포름, 에탄올, 메탄올, 메틸렌 클로라이드)에 따른 영향을 조사한 결과, 메탄올이 모든 추출 방법에서 가장 적합하였다. 메탄올을 이용한 MAE와 UAE의 경우, 단 1회의 추출로 대부분의 파클리탁셀 회수(>95%)가 가능하였다. 또한 MAE와 UAE의 경우 추출 온도(25-45 ℃), 마이크로웨이브 파워(50-150 W), 초음파 파워(180-380 W)의 증가에 따라 파클리탁셀 회수율이 증가하였다. 또한 SEM 분석을 통해 바이오매스 표면을 조사한 결과, 표면 구조가 CSE의 경우에는 조금 주름진 형태를 보인 반면 MAE와 UAE의 경우에는 강한 충격으로 매우 거칠고 파괴된 형태를 보였다.

• 자원리싸이클링
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• 제23권2호
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• pp.37-45
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• 2014

Nd와 Pr이 함유된 모나자이트 샌드의 염산침출용액에서 Cyanex272 및 PC88A를 기반으로 한 TBP 및 Cyanex272와의 혼합용매를 사용하여 두 금속을 분리하기 위한 용매추출실험을 시행하였다. 이러한 목적을 위해 수상의 pH에 따른 추출제의 농도가 두 금속의 추출 및 분리에 미치는 영향을 조사하였다. 본 연구의 실험범위에서 Nd의 분배계수가 Pr의 분배계수보다 컸다. Cyanex272로 추출하는 경우 추출제의 농도와 초기 pH는 분배계수에 영향을 미치지 않으나, 초기 pH가 증가할수록 분리인자는 증가하였다. 혼합용매의 경우 PC88A를 단독으로 사용했을 때보다 분배계수가 낮고 분리인자에 차이가 없었다.

• 자원리싸이클링
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• 제14권2호
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• pp.33-42
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• 2005

Nd와 Sm이 혼합된 염산용액에서 PC88A에 의한 두 금속의 분리에 대한 실험을 수행하였다. 또한 PC88A의 비누화가 두 금속의 추출 및 분리에 미치는 영향을 조사하였다. 본 연구에서 수행한 실험조건에서 Sm의 분배계수가 Nd의 분배계수보다 크며, 분리인자는 수상의 pH에 따라 증가하였다. 비누화 PC88A로 추출하는 경우 PC88A로 추출하는 경우에 비해 분배계수와 분리인자 모두 증가하였다. PC88A와 비누화 PC88A에 의한 추출시 초기추출조건으로부터 Nd와 Sm의 분배계수와 분리인자를 예측할 수 잇는 모델을 개발하였다. 본 연구에서 개발된 모델을 초기추출조건에 적용하여 예측한 Nd와 Sm의 분배계수는 실험으로 측정한 값과 서로 잘 일치하였다.

• 자원리싸이클링
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• 제17권1호
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• pp.12-19
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• 2008

Gd와 Nd이 혼합된 염산용액에서 PC88A와 비누화 PC88A에 의한 용매추출실험을 하였다. 본 연구에서 수행한 실험조건에서 H88A에 의해 Gd이 Nd보다 추출이 잘 되었으며, 40% 비누화된 H88A를 사용하여 Gd와 Nd의 분배계수가 증가하였다. PC88A와 비누화 PC88A에 의한 추출시 초기추출조건으로부터 Gd와 Nd의 분배계수를 예측할 수 있는 모델을 개발하였다. 본 연구에서 개발된 모델을 초기추출조건에 적용하여 예측한 Gd와 Nd의 분배계수는 실험으로 측정한 값과 서로 잘 일치하였다

• 한국재료학회지
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• 제34권5호
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• pp.247-253
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• 2024

The separation of zirconium and hafnium using tributyl phosphate (TBP)-Dodecane extractants in nitric acid medium was performed. Zirconium oxychloride, used as extraction feed, was obtained from the synthesis of Kalimantan zircon sand concentrate smelted using NaOH. The extraction process was carried out by dissolving chloride-based metals in nitric acid media in the presence of sodium nitrate using TBP-Dodecane as an extractant. Some of the extraction parameters carried out in this study include variations in organic phase and aqueous phase (O/A), variations in contact time, and variations in nitric acid concentration. Extraction was carried out using a mechanical shaker according to the parameter conditions. X-ray fluorescence (XRF) was used for elemental (Zr and Hf) composition analysis of the aqueous solution. The results showed that zirconium was separated from hafnium at optimum conditions with an organic/aqueous ratio of 1:5, contact time of 75 min, and an HNO₃ concentration of 7 M. The resulting separation factor of zirconium and hafnium using TBP-Dodecane was 14.4887.