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HWAHAK KONGHAK,
Vol.31, No.4, 466-474, 1993
Vol.31, No.4, 466-474, 1993
Methylheptanedione에 의한 Cu(II)의 추출특성
Characteristics of Cu(II) Extraction by Methylheptanedione
Sodium amide에 의한 methyl isobutyl ketone과 초산에틸간의 반응으로 -diketone인 methylheptanedione（이하 MHD）을 합성하고, 클로로포름 용매하에 Cu(II)의 용매추출실험으로부터 추출평형 및 추출속도 등을 고찰하였다. 흡광도와 Cu의 농도변화 측정으로부터 MHD의 분배계수, 해리정수, MHD-Cu착화합물의 분배계수, 안정도 상수 및 총괄추출 평형정수 등을 구하고 추출 기구를 구명하였다. MHD에 의한 Cu(II)의 추출 화학종은 1:2의 형태인 CuR2였으며, MHD-클로로포름에 의한 Cu(II)의 총괄 초기추출속도는 R0=3.3×10-9[HR]([Cu2+]/[H+])0.5(mol/cm2sec)로 표시되었다.
The equilibrium and kinetic characteristics of copper extraction by methylheptanedione（abbreviated to MHD） synthesized from methylisobutylketone and ethylacetate with sodium amide were investigated. Equilibrium constants such as the dissociation constant and the distribution coefficient of MHD were determined from the molecular extinction coefficient of MHD. The stability constant of MHD-Cu chelate and the overall equilibrium constant in Cu-extraction by MHD-chloroform were also determined, and the mechanism and the rate of copper extraction by MHD-chloroform were proposed. The extracted species of Cu-chelate was found to be CuR2 and the overall initial extraction rate was expressed by R0=3.3×10-9[HR]([Cu2+]/[H+])0.5(mol/cm2sec).
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