About The Journal
  Aims and Scope
  Editorial Board
  Submit a Manuscript 
  Subscription Information
Articles & Issues
  Issue
  Search
For Authors
  Instructions to Authors
  Ethics in Publishing
  Peer Review Process
  Author's Checklist
  Copyright Transfer Form
Contact us
 
 
 
 
Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.28, No.3, 264-270, 1990
D2EHPA 및 Dithizone에 의한 납의 추출평형
Equilibrium in the Extraction of Pb(II)by D2EHPA and Dithizone
이재홍, 남세종
납 수용액으로부터 di(2-ethylhexyl) phosphoric acid(D2EHPA)-carbon tetrachloride와 di-phenylthiocarbazone(dithizone)-chloroform을 사용한 추출평형을 측정하였다. D2EHPA일 때 적용 한계 부하비 0.05이하에서 추출화학종은 PbR2(RH)2이고 평형상수는 3.0×10-3이었으며, 추출제 di-thizone일 때 적용한계 부하비 0.03 이하에서 추출화학종은 Pb(Dz)2이고 평형상수는 1.2×10-1이었다. 한계 부하비를 넘으면 추출화학종과 평형상수는 D2EHPA일 때 (PbR2)n(RH)2, 6×10-3이고 dithizone일 때[Pb(Dz)2]n, 2.2[m3/mol]로 각각 변하였다. 식초산 완충용액을 수용액상에서 가하면 추출상수는 다소 감소하였고 유기상에 계면활성제 Span#80을 첨가하면 평형상수는 약간 증가하였다.
Measurements of the extraction equilibrium of lead acetate aqueous solution with di(2-ethylhexyl)phosphoric acid(D2EHPA)in carbon terachloride, and diphenylthiocarbazone (dithizone)in choloroform were carried out at 25℃. Over the range of loading ratios less then 0.05for D2EHPA and 0.03 for dithizone, the extracted organic metal species and equilibrium constants were found to PbR2(RH)2. 3.0×10-3 for D2EHPA and to Pb(Dz)2. 1.2×10-1 for dithizone. Upon increasing the loading ratio above the threshold value, the extracted chemical species and equilibrium constants were estimated to (PbR2)n(RH)2. 6×10-3 for D2EHPA, and to [Pb(Dz)2]n, 2.2[m3/mol] for dithizone. The equi-librium constants were found to decrease upon adding of acetic buffers, and to a little increase by addition of Span#80.
[References]
  1. Kondo K, Takahashi S, Ysuneyuki T, Nakashio F, J. Chem. Eng. Jpn., 11, 193, 1978
  2. Yoshizuka K, Kondo K, Nakashio F, J. Chem. Eng. Jpn., 18, 163, 1985
  3. Hoh YC, Wang WK, J. Chem. Technol. Biotechnol., 31, 345, 1981
  4. Suh DH, Kim SS, M. Eng. Dissertation, Inha Univ., 1982
  5. Biehl MP, Izatt RM, Loamb JD, Christensen JJ, Sep. Sci. Technol., 17, 289, 1982
  6. Komasawa I, Otake T, Hattori I, J. Chem. Eng. Jpn., 16, 210, 1983
  7. Komasawa I, Otake T, Ind. Eng. Chem. Fundam., 22, 122, 1983
  8. MeClellan BE, Freiser H, Anal. Chem., 36, 2262, 1964
  9. Oh JS, Freiser H, Anal. Chem., 39, 295, 1967
  10. Bayes CF, Zingaro RA, Coleman CF, J. Phys. Culm., 62, 129, 1958
  11. Brisk ML, MeManamey WJ, J. Appl. Chem., 19, 103, 1969
참고문헌정보(참고문헌, 인용문헌)는 화학공학소재연구정보센터에 의해 제공되고 있습니다.