THE USE OF DICYCLOHEXANO-18-CROWN-6 AS AN EXTRACTANT-CARRIER FOR THE RECOVERY OF CHROMIC-ACID

被引：27

作者：

ZOUHRI, A ^{[1
]}

BURGARD, M ^{[1
]}

LAKKIS, D ^{[1
]}

机构：

[1] ECOLE EUROPEENNE HAUTES ETUD IND CHIM STRASBOURG,CHIM MINERALE & ANALYT LAB,CNRS,URA 405,F-67008 STRASBOURG,FRANCE

来源：

HYDROMETALLURGY | 1995年 / 38卷 / 03期

关键词：

D O I：

10.1016/0304-386X(94)00073-C

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The solvent extraction and transfer through a bulk liquid membrane of chromic acid in sulphate media by dicyclohexano 18 crown 6 (DC18C6, L) in dichloromethane takes place due to the formation of the complex ion pair [(H(3)O(+)L] [HCr2O] in the organic phase. In spite of the presence of a large a excess of sulphuric acid, the co-extraction and co-transport of sulphuric acid is very slight. The extraction and transport are also selective with respect to Ni2+, Cr3+ and Fe3+ cations. The selectivity of the transfer process characterizes the semi-permeability of the liquid membrane, which is able to concentrate chromic acid according to the Donnan equilibrium. The transport kinetics are explained by the two-film theory, applied to the liquid membrane (diffusion through the stagnant films, reaction equilibrium at the interfaces).

引用

页码：299 / 313

页数：15

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[2]

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[3]

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