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HWAHAK KONGHAK,
Vol.34, No.6, 806-812, 1996
Vol.34, No.6, 806-812, 1996
소수성 실관막 모듈을 이용한 중금속추출에 관한 연구
A Study on the Extraction of Heavy Metals by use of Hydrophobic Hollow Fiber Membrane Module
특정 용질에 대해 화학적 친화력을 가진 추출제를 사용하여 실관막 모듈을 통해 액-액추출 조작을 행할 경우, 실관막의 단위부피당 표면적이 매우 크기 때문에 물질전달이 대단히 신속하다. 본 연구에서는 Cd(II)와 Co(II)를 산성 수용액으로부터 추출하기 위해 소수성 실관막을 사용하였으며, 추출제로서는 D2EHPA(di-2-ethylhexylposphoric acid), TOPO(trioctylphosphine oxide) 및 TOA( tri-n-octylamine)를 사용하였다. 그 결과, Cd(II)는 TOPO에 양호하게 추출되었으며, D2EHPA는 Co(II)에 대해 우수한 추출제로 작용하였다. 소수성 실관막에서의 율속단계를 결정하기 위해 실관막 내.외부의 유속에 대한 영향을 실험하였다. 분배비가 큰 계에서는 실관 내부수용액에서의 물질전달이 전체 물질전달을 지배하였으며, 본 연구에서 Kw와 실관 내부유속과의 상관관계는 (Kwd/ D)=1.89(d2Vt/LD)1/3를 얻었다. 반면, 분배비가 작은 계의 경우는 실관막 내부저항이 막세공에 비해 작았다.
When liquid-liquid extractant processes through the hollow fibers membrane module by using extractants having the chemical affinity for a specific solute, mass transfer is unusually fast because of the large surface area per volume of the hollow fiber membrane. The extractions of Cd(II) and Co(II) from acidic aqueous solution were carried out by using the hydrophobic hollow fiber membrane. The extractants used in this work were D2EHPA (di-2- ethylhexyl- phosphoric acid), TOPO(troctylphosphine oxide)and TOA(tri-n-octylamine) for the metal ions extraction. Cd(II) was extracted very well by TOPO, D2EHPA was good extractant for Co(II) extraction. To determine the rate controlling step in the hydrophobic hollow fibers, we also examined the effect of inside and outside flow rates of the hollow fibers membrane. For the system with high distribution ratio, mass transfer in the inside aqueous feed dominated the overall mass transfer, and in this paper, correlation between Kw and inside velocity was ob- tained as (Kwd/D)=1.89(d2Vt/LD)1/3. On the other hand, for the system with low distribution ratio, the resistance in the inside of hollow fibers was much less than membrane resistance.
Keywords:
Hydrophobic Hollow-Fiber; Extraction
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