Selective dissolution of copper oxalate using supported liquid membranes

Damir Kralj, Gerdi R.M. Breembroek, Geert Jan Witkamp*, Gerda M. Van Rosmalen, Ljerka Brečević

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


A supported liquid membrane has been used to dissolve selectively copper oxalate from a suspension of copper, calcium and cadmium oxalate, which have low, similar solubilities. 2-Hydroxy-5-nonyl-acetophenone oxime (HX) dissolved in kerosene was used as a carrier for copper transport from the suspension to the stripping solution. A mathematical model of the copper permeation is presented. The model takes into account the dissolution kinetics of CuC2O4·1/2H2O, the diffusion of copper ions through an aqueous stagnant layer, the chemical reaction at the aqueous/membrane interface, and the diffusion of the CuX2 complex in the membrane. The model fits the experimental data well with a unique parameter set, except for the transport from an acetate buffered system, for which a lower rate constant for the reaction at the membrane interface had to be assumed. In a separate set of experiments the dissolution of copper oxalate hemihydrate in water was found to be surface reaction controlled.

Original languageEnglish (US)
Pages (from-to)705-720
Number of pages16
JournalSolvent Extraction and Ion Exchange
Issue number4
StatePublished - Jan 1 1996
Externally publishedYes


  • 2-hydroxy-5-nonyl-acetophenone-oxime
  • Copper oxalate
  • Selective dissolution
  • Supported liquid membranes
  • Suspension

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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