Influence of alkyl chain length and structure on the extraction of copper(II) from aqueous acid by 5-alkyl-2-hydroxybenzaldoximes in hydrocarbon solvents: Diffusion coefficients of extractants and their complexes

Ainscow, T.A. and Aldalur, I. and Beezer, A.E. and Connor, J.A. and Garbett, N.C. and Mitchell, J.C. and Page, A.L. and Tindale, N. and Turner, K.A. and Willson, R.J. (1999) Influence of alkyl chain length and structure on the extraction of copper(II) from aqueous acid by 5-alkyl-2-hydroxybenzaldoximes in hydrocarbon solvents: Diffusion coefficients of extractants and their complexes. Journal of Colloid and Interface Science, 213 (1). pp. 87-91. ISSN 0021-9797. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1006/jcis.1999.6113

Abstract

Measurement of the kinetics of extraction of copper(II) by 19 different 5-alkyl-2-hydroxybenzaldoximes (alkyl is C7H15 and C9H19) from acidic (hydrogen sulfate buffer) aqueous solution in the range pH 3.4-2.0, into 20% v/v toluene in n-hexane is reported. The lowering of the interfacial tension has been measured in some cases. The solubility of the extractants in water has been measured spectrophotometrically. A modified Taylor-Aris dispersion technique has been used to measure the diffusion coefficients in n-hexane and Orfom SX7 of some of the extractants and of the copper(II) complexes which they form. At low initial bulk concentrations (<10 mol m(-3)) of the extractants, the rate of extraction is controlled by the rate of diffusion of the extractant from the bulk to the organic-aqueous interface. The diffusion coefficient is related to the steric bulk of the alkyl substituent. At higher initial bulk concentrations (200 mol m(-3)) of the extractants, when the interface is saturated, the rate of extraction is inversely related to the apparent steric bulk of the alkyl substituent. (C) 1999 Academic Press.

Item Type: Article
Uncontrolled keywords: extraction; copper; diffusion coefficients; structure; kinetics
Subjects: Q Science > QD Chemistry
Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: M. Nasiriavanaki
Date Deposited: 25 Jul 2009 15:58
Last Modified: 25 Jul 2009 15:58
Resource URI: http://kar.kent.ac.uk/id/eprint/17010 (The current URI for this page, for reference purposes)
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