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Alky β-diketone에 의한 구리의 추출속도에 관한 연구
A Study on the Rate of Copper Extraction by Alkyl β-Diketones
HWAHAK KONGHAK, June 1994, 32(3), 367-375(9), NONE
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Abstract
25℃에서 일정 계면적의 수평 교반조를 사용하여 킬레이트형 금속 추출제로서 수종이 알킬β-diketone의 클로로포름 용액에 의한 수용액으로부터 구리의 추출속도 특성을 고찰하였다. 유기상의 추출제 농도와 수상의 구리 및 수소이온 농도 등의 초기 추출속도에 대한 영향을 검토하여 실험적 상관관계를 구하였으며, 경막설에 기준하여 수상측 경막 내에서의 확산을 고려한 계면 반응에 따라 킬레이트 생성속도를 이론적으로 고찰하고, 이로부터 추출속도식을 도출하여 실험결과와 비교함으로써 킬레이트 생성 속도정수 및 초기 추출속도정수를 결정하였다. 또한 β-diketone계 킬레이트 추출제에 의한 구리의 추출속도 결정단계는 추출제와 구리간 1:1 킬레이트 생성반응으로서 비가역 유사 1차의 반응단계이며, 추출종은 CuR2형임을 규명하였다.
The kinetics of copper extraction by several alkyl β-diketones diluted with chloroform was investigated using a flat-stirred cell of constant interfacial area at 25℃. The extraction rate was experimentally determined by analyzing the effects of the concentration of extractants in the organic phase, the concentrations of copper and hydrogen ion in aqueous phase on the initial rate of extraction. The rate constants of chelate formation and initial extraction were determined from the comparison of the experimental results with the theoretical rate obtained by assuming the interface reaction with diffusion in aqueous film. The rate determining step of copper extraction by β-diketones was found to be the reaction of 1:1 chelate formation of irreversible pseudo-first order reaction and the extracted species was CuR2 type.
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Pearlmutter AF, Stueher J, J. Am. Chem. Soc., 90, 858 (1968)
Holyer RH, Hubbard CD, Kettle SFA, Wilkins RG, Inorg. Chem., 4, 929 (1965)
