EXTRACTION OF MOLYBDENUM AND VANADIUM FROM HYDROCHLORIC ACID BY TRI-n-BUTYL PHOSPHATE IN VARIOUS DILUENT SOLUTIONS

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

HIROYUKI HOSOBA¹  TSUTAO OTAKE¹  ISAO KOMASAWA¹  NOBUHIRO KUROKAWA¹ 

[1] Department of Chemical Engineering, Osaka University

关键词: Chemical Equilibrium;    Metal Extraction;    Diluent Effect;    Solvation;    Tri-n-butyl Phosphate;    Molybdenum;    Vanadium;    Electron Donor;    Electron Acceptor;   

DOI  :  10.1252/jcej.20.176

来源: Maruzen Company Ltd

【 摘 要 】

References(21)Cited-By(8)The mechanism of extraction was studied, employing several diluents with differing electron-accepting properties. For molybdenum, from 3-7 mol/l acid, the following formulation holds for all diluents and over the whole range of loading ratio of TBP. 2TBP+MoO22++2CL-=(TBP)2MoO2CL2 KexThe extraction constants are 4.42 for n-heptane, 1.50 for xylene and 0.0114 for chloroform at low loading. They start to decrease sharply at medium and high loading. This is caused by the variation of properties of the organic solution due to the presence of the excessive amount of organic molybdenum. For vanadium, from 2-5 mol/l acid, the following formulations hold in the range observed. 4TBP+VO2++H++3CL-=(TBP)4VO(HCL)CL2 Kex.1 4TBP+VO2+2CL-=(TBP)4VOCL2 Kex.2The constants are Kex, 1 = 1.41 × 10-5 and Kex, 2=9.19 × 10-5 in xylene diluent. They remain constant in the range of normal operation, since the extractability of TBP for this metal is very low.

【 授权许可】

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