• 한국식품영양학회지
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• 제4권2호
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• pp.141-148
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• 1991

In order to Investigate the extraction mechanism of barley tea in cylindrical packed column, pilot plant scale packed column was designed and constructed. And extraction conditions for steady flow in the packed column were searched. The main results of this study are as follows ; 1. Circulation of the stock barley tea before the extraction running was indispensable In consideration of inequality, gas, particles existed in packed bed. Solid-liquid equilibrium was initially maintained after the circulation. 2. Flow direction of solvent must be up-flow for maintaining the constant bed height and flow rate during the extraction. Paessure drop in pucked bed was similar to decrease ratio of extract concentration. 3. The porosity of packed bed was in the range of 0.24∼0.36 according to the particle sloe. And it was decreased as the particle size became smaller.

• Bulletin of the Korean Chemical Society
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• 제32권1호
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• pp.113-116
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• 2011

Slope analysis method was applied to determine the stoichiometry of the solvent extraction reaction of Ni(II) by Alamine336 from strong HCl solution range from 1 to 10 M. Solvent extraction data was obtained from the literature. The effective equilibrium constant for the solvent extraction reaction was estimated by considering the ionic equilibria of $NiCl_2$ in the HCl solution. The measured distribution coefficients of Ni(II) agreed well with those calculated in this study. Our results suggest that further study on the measurement of the activities of nickel complexes at high HCl solution need to be done.

• Biotechnology and Bioprocess Engineering:BBE
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• 제9권3호
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• pp.207-211
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• 2004

Predispersed solvent extraction (PDSE) of succinic acid with Tri-n-octylamine (TOA) dissolved in 1-octanol from aqueous solutions of 50 g/L succinic acid was examined. It was found that the equilibrium data in PDSE was equal to that in conventional solvent extraction in spite of the lack of mechanical mixing in PDSE. The influence of salts on succinic acid extraction and the stability of colloidal liquid aphrons (CLAs) were also investigated. Results indicated that in the presence of sodium chloride, less succinic acid was extracted by CLAs and the stability of CLAs decreased. However, the stability of CLAs was sufficient to make PDSE practically applicable to real fermentation broth, considering the concentration range of salts in the fermentation process for succinic acid.

• Journal of Industrial and Engineering Chemistry
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• 제67권
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• pp.109-122
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• 2018

This work highlights extraction and removal of Lignosulfonate using sunflower oil-Tri-n-octylamine (TOA) system in bulk liquid membrane transport. Maximum extraction and recovery percentages of 92.4% and 75.2% were achieved. Optimum manifold operating conditions were: 4 vol.% TOA, $2{\pm}0.1$ feed phase pH, 300 rpm stirring speed, at $40^{\circ}C$ with 0.2 (M) $Na_2SO_4$ solution. 1:2 (organic/aqueous) and 1:1 (aqueous/aqueous) phase ratios produced best results. Extraction (36.85 kJ/mol) was found to be intermediate controlled and stripping (54.79 kJ/mol) was chemical reaction controlled. Kinetic estimation of data with higher rate constants for stripping vis-${\grave{a}}$-vis extraction showed latter to be rate determining.

• 분석과학
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• 제10권1호
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• pp.60-65
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• 1997

mono-crown ether(benzo-15-crown-5)와 benzo-15-crown-5를 포함한 bis-(crown ether)s(ethylenediamine bis(4'-formylbenzo-15-crown-5))에 의한 알칼리금속과 알칼리토금속 양이온들의 용매추출을 $25^{\circ}C$, 물-클로로포름계에서 조사하였다. mono-crown ether와 bis-(crown ether)s를 사용한 경우 알칼리금속과 알칼리토금속 양이온들에 대한 추출평형상수($K_e$)와 착물형성상수($K_c$)의 크기 순위는 각각 Ca(II)>Na(I)>Sr(II)>K(I)>Mg(II)>Rb(I)와 Sr(II)>Ca(II)>K(I)>Rb(I)>Mg(II)>Na(I) 순으로 증가하였다. 이들 크기 순위는 금속 양이온의 크기 및 전자밀도효과로서 설명할 수 있었다. 또한 mono-crown ether에 비해서 bis-(crown ether)s를 사용한 경우 금속양이온들에 대한 추출효율이 좋게 나타남을 알 수 있었다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 추계학술발표회
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• pp.354-355
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• 2003

In this study, a risk-based cleanup approach using the leaching potential was suggested for the soil vapor extraction (SVE) process. A multi-component model was adopted with local equilibrium assumption (LEA), and Raoult's law was applied to estimate the leaching potential for BTEX. Finally, a risk analysis was conducted based on the leaching pontential calculated. To complete the feasibility of this approach, more investigations and discussions will be required in future.

• Bulletin of the Korean Chemical Society
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• 제16권6호
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• pp.479-483
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• 1995

The synergistic extraction of palladium(Ⅱ) was studied with 1,2-dichloroethane containing thenoyltrifluoroacetone (TTA; HA) and tri-n-octylphosphine oxide (TOPO; S). The main composition of synergistic adduct extracted into 1,2-dichloroethane phase was found to be PdA2S2. The equilibrium constants of the synergistic reaction were calculated. The application of this method to synthetic mixture for the separation of Pd from Pt was developed.

• 공업화학
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• 제5권1호
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• pp.149-159
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• 1994

금속의 용매 추출에 amidoxime의 추출제로서의 특성을 검토하기 위하여 benzamidoxime 및 phenylacetamidoxime에 의한 금속 추출평형 및 추출속도에 관한 실험 및 이론적 고찰을 하였다 Cu, Pb, Zn 및 Cd 등 단독 금속계와 혼합 금속계에 대한 amidoxime-클로로포름에 의한 추출에서 추출비와 수소이온 농도 및 추출제 농도간의 상관관계로부터 추출기구와 추출성을 검토하고, 수상측 경막 내 확산 방정식으로부터 도출된 이론적 속도식과 실험적 속도식을 비교함으로써 초기 추출 속도식은 $R_o=k{\overline{C}}_{HRO}(C_{Mo}/C_{Ho})^{1/2}$로 표시할 수 있었으며, 추출과정의 율속 단계를 고찰하였다. amidoxime에 의한 Cu의 추출 화학종은 ${\overline{CuR_2}}$의 형이었다.

• Nuclear Engineering and Technology
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• 제53권4호
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• pp.1218-1223
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• 2021

A hydrophobic ionic liquid including an amino moiety ([DiOcAPmim][NTf₂]) was synthesized. Its extraction behaviors towards Pd(II), Ru(III), Rh(III) were investigated in nitric acid aqueous solution as a function of contact time, effect of concentration of nitric acid, effect of temperature, and effect of co-existing metal ions. The extraction kinetics of Pd(II) was fairly fast and extraction equilibrium can be attained within only 5 min under the [HNO₃] = 2.05 M. When [HNO₃]< 1 M, the extraction percentage of Pd(II), Ru(III), Rh(III) were all above 80%. When [HNO₃] reached 2 M, all of the extraction percentage decreased and in an order of Pd(II)>Ru(III)>Rh(III). When [HNO₃]> 2 M, the extraction performance gradually recovered. The effect of temperature can slightly affect the extraction performance of Pd(II). Furthermore, in simulated high-level liquid waste, [DiOcAPmim][NTf₂] showed a better preference towards Pd(II) under the interference of various other co-existing metal ions.

• 한국환경과학회지
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• 제6권2호
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• pp.133-139
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• 1997

말로네이트 제조 공정에서 발생되는 폐액으로부터 용매추출법을 적용하여 코발트 회수 연구를 하였다 용매 추출에서의 주요 변수는 용매의 선택, pH, 코발트 농도, 역추출 온도 등이며 이러한 변수들의 영향을 조사하였다. 용매로써 DEHPA와 PC88A가 사용되었으며 이들 용매의 평형추출 곡선을 구하였다. 공장설계 조건을 찾기 위하여 Mccabe-Tiele 선도를 작성하였고, 연속 공정인 믹서-세틀러 장치를 가동하였다. 본 연구 결과 폐액 중에서 코발트는 99.9% 이상 회수되었고, 회수된 황산코발트의 순도는 99.9% 이상이었다.