• 자원리싸이클링
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• 제11권6호
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• pp.12-17
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• 2002

$CuCl_2$-$NiCl_2$-$CoCl_2$용액으로부터 구리를 분리하기 위해 추출제로 Alamine336과 LIX84를 사용하여 추출실험을 하였다. 염산용액에서 Alamine336과 LIX84에 의한 구리, 코발트, 니켈의 분배계수와 구리의 분리계수는 금속이온과 염소이온간에 형성되는 착물의 농도에 큰 영향을 받았다. 염소이온농도가 0.5에서 4.0M사이인 용액에서 코발트로부터 구리의 분리성은 LIX84가 Alamine336보다 우수하였다. 염소이온농도가 1.0M인 용액에서 LIX84와 Alamine336의 부피백분율을 5에서 40%까지 변화시켜 추출한 결과 LIX84로 추출하는 경우 Alamine336에 비해 더 높은 구리의 분리계수를 얻었다.

• 한국물환경학회지
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• 제22권1호
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• pp.122-127
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• 2006

Fundamental studies were carried out for an effective removal and recovery of silver from waste photo-developing solution by solvent extraction. The organic solvents examined for silver-extraction were ALIQUAT 336, D2EHPA, KELEX 100, and TBP. ALIQUAT 336, which is an anionic exchanger, was found to be efficient for the extraction of silver and the reason for this was considered to be due to the chloride ion contained in its structure. The extent of silver extraction was examined to increase with the concentration of ALIQUAT 336 until it reached 0.6 M and no more extraction was observed above this concentration. The extraction of silver by ALIQUAT 336 was found to reach its pseudo-equilibrium within a few minutes after the reaction started and additional slight increase in silver extraction was observed until 30 minutes of reaction time. The observed differences in silver extraction for artificial and actual waste solutions were considered to be based upon the different ionic form of silver-containing species in these solutions.

• 상하수도학회지
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• 제12권3호
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• pp.30-40
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• 1998

Increasing water consumption produced sludge problems of the water treatment plants. The objective of this study is to investigate aluminium coagulants recovery n acidic and alkaline conditions. Water treatment plant sludge produced in Pusan Metropolitan City were tested for the aluminium extraction process. Experiment samples were obtained in summer from water treatment plants of Deoksan and Myongjang. Aluminium coagulants used in these plants during the test period were polyaluminium chloride(PAC), polyaluminium sulfate organic(PSO), polyaluminium sulfate silicate(PASS). Aluminium contents of water treatment sludge were in the range of 7.2~10.9% of the total solids. The recovery percentages for aluminium and iron by acidic extraction method was evaluated to 88% and 42% respectively. Extracted mass variation for other materials such as iron, manganese, total organic carbon was observed during the extraction operation. Alkaline extraction produced more than two times amount of total organic carbon than that in the acidic extraction process.

• 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.

• Bulletin of the Korean Chemical Society
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• 제21권11호
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• pp.1101-1105
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• 2000

A simultaneous determination method of BTEX (benzene, toluene, ethylbenzene, o,m.p-xylene) and TPH (kerosene, diesel, jet fuel and bunker C) in soil with gas chromatography/flame ionization detection (GC-FID) was described. The effects of extracti on method, extraction solvent, solvent volume and extraction time on the extraction performance were studied. A sonication method was simpler and more efficient than Soxhlet or shaking methods. Sonication with 10 mL of acetone/methylene chloride (1 : 1, v/v) for 10 min was found to be optimal extraction conditions for 20 g of soil. Peak shapes and quantification of BTEX and TPH were excellent, with linear calibration curves over a wide range of 1-500 mg/L for BTEX and 10-5000 mg/L for TPH. Good reproducibilities by sonication were obtained, with the RSD values below 10%. By using about 20 g of soil, detection limits were 0.8 mg/L for BTEX and 10 mg/L for TPH. The advantages of this procedure are the use of simple and common equipment, reduced volumes of organic solvents, rapid extraction periods of less than 20 min, and simultaneous analysis of volatile and semivolatile compounds.

• 자원리싸이클링
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• 제23권1호
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• pp.17-24
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• 2014

Nd와 Pr이 함유된 모나자이트 샌드의 염산 침출용액에서 PC88A와 D2EHPA를 사용하여 두 금속을 분리하기 위한 용매추출실험을 수행하였다. 이러한 목적을 위해 수상의 pH에 따른 PC88A와 D2EHPA의 비누화가 두 금속의 추출 및 분리에 미치는 영향을 조사하였다. 본 연구에서 수행한 실험조건에서 Nd의 분배계수가 Pr의 분배계수보다 크며, 수상의 pH가 높을수록 분리인자가 증가하였다. PC88A에 비해 비누화시킨 PC88A로 추출하는 경우 분배계수와 분리인자 모두 증가하였다. D2EHPA의 비누화율은 두 금속의 추출에는 영향을 미치지만, 분리인자에는 큰 변화가 없었다.

• Korean Chemical Engineering Research
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• 제51권1호
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• pp.53-57
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• 2013

해수담수화장치에서 배출되는 농축수로부터 희소금속인 리튬을 추출하는 공정을 개발하기 위한 선행 연구로, 용매추출제 TTA와 TOPO를 사용하여 수용액 중의 리튬이온을 추출하는 연구를 수행하였다. 추출제의 농도, 유기용매의 종류, 추출액과 수용액의 비, 수용액의 pH 및 알칼리제 종류 등을 변화시키면서 리튬 이온의 용매추출에 미치는 영향을 조사하였다. 해수의 주요 성분인 염화나트륨의 첨가가 리튬 이온의 용매추출에 미치는 영향도 함께 조사하였다. 리튬 추출의 최적 조건은 추출제 농도는 TTA 0.02 M, TOPO 0.04 M, 유기용매는 케로센, pH는 10.2~10.6 이었으며, 알칼리제로는 암모니아 수용액을 사용한 경우 리튬이온의 추출효율이 가장 높았다. 또한 염화나트륨을 첨가하여 리튬 용매추출을 진행한 결과 염화나트륨은 리튬이온의 추출을 방해하는 것을 알 수 있었다.

• 자원리싸이클링
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• 제28권1호
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• pp.55-61
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• 2019

묽은 염산용액의 pH를 2에서 9까지 변화시켜 아민계(Alamine 308과 TEHA)와 중성추출제(TOP)로 몰리브덴(VI)과 텅스텐(VI)의 용매추출거동을 조사하였다. 텅스텐(VI)이 몰리브덴(VI)보다 상기 세 추출제에 선택적으로 추출되었으며, TEHA로 추출시 가장 높은 분리인자를 얻었다. 수소화처리하지 않은 3차 아민에 의한 두 금속의 추출율은 용액의 pH에 따라 지속적으로 감소하여 pH 9에서는 전혀 추출되지 않았다. 본 논문의 실험조건에서 용매추출거동을 금속의 농도분포곡선을 이용하여 설명하였다. Alamine 308과 TEHA는 TOP에 비해 두 금속의 추출과 분리에 효과적이다.

• 한국세라믹학회지
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• 제13권1호
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• pp.25-29
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• 1976

The properties vary with quality of ferric-oxide that is major material of ferrites. In this point of view, a manufacturing method of pure and homogeneous fine ferric oxide is very important. The characters of this study are as follows: 1) Ferric oxide was made from waste pickling liquor of steel. 2) The crude ferric-oxide that is made by roasting the pickling liquor was dissolved in 20% HCI solution and then produced ferric chloride is purified by ethyl ether extraction. 3) The methanol solution of purified ferric chloride was sprayed into the refractory tube with compressed air and propane gas and then ignited leading to the ferric-oxide powder. 4) The produced oxide powder was introduced to the scrubber type vessel throught cooling system in order to collect the powder. 5) Crystalline phase of the powder was identified by X-ray diffraction and particle size, crystalline shape of the powder were investigated by settling method and electron microscope and the effects of concentration of ferric chloride in methanol on grain size were discussed. Results were obtained as fellows: 1) Total impurity in the ferric oxide produced from waste pickling liquor was 3.7%. 2) The solubilityof crude ferric oxide that was made from waste pickling liquor in HCI solution increased with the HCI concentration and reached to saturation range at 15% HCI concentration. 3) Extraction of FeCl3 increased with HCI concentration which is solvent. 4) Alpha ferric oxide obtained was very fine crystalline particles, the mean crystalline grain increased with the concentration of ferric chloride, and mean grain size distributed from 3.5$\mu$(at 0.5mole/l) to 0.5$\mu$(at 0.05mole/l).

• 한국식품과학회지
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• 제27권1호
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• pp.80-85
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• 1995

국내산 재배 생약류의 용매추출물의 항산화력 비교를 위해 28가지 생약류를 methylene chloride로 각각 추출한 후 linoleic acid에 1,000 ppm 첨가하여 항산화력을 비교하였다. 28종의 생약 methylene chloride 추출물들은 대조구에 비해 다소 차이는 있으나 모두 항산화력을 나타내었다. 황금추출물은 BHA와 비슷한 수준의 항산화력을 보였으며, 목단과 맥문동은 황금보다는 효과가 떨어졌으나 비교적 높은 항산화 효과를 나타내었다. Methylene chloride 추출물의 항산화 효과는 황금이 가장 뛰어난 것으로 나타났으므로 극성이 서로 다른 9가지용매로 추출하였을 때 전반적으로 극성이 높아질수록 수율이 높아졌다. 국내산 생약류의 생리활성을 알아보기 위하여 열수추출물의 아질산염 소거작용, 전자공여 작용 그리고 항보체 활성을 조사하였다.