Identification of the rate limiting step locus in the extraction of ni(ii) by dinonylnaphthalenesulphonic acid

C. A. Savastano, E. S. Ortiz, Kwadwo Asare Osseo-Asare

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Experimental results are presented and discussed that demonstrate the interfacial character of the rate-1imiting step (RLS) in the 1iquid-1iquid extraction of Ni(II) by n-hexane solutions of dinonylnaphthalenesulphonic acid (HDNNS) in a non-dispersing stirred reactor. The possibility of a RLS in the bulk aqueous phase was excluded based on the classical criterion of volume-independent transfer rates per unit volume, and a criterion involving dissolution fluxes of the extractant into the aqueous phase. The aqueous diffusion film was excluded as the site to the RLS on the basis of HDNNS partition results. The combination of extractant distribution and dynamic transfer results is shown able to unequivocally identify the site of the RLS for this reactive system.

Original languageEnglish (US)
Pages (from-to)401-423
Number of pages23
JournalSolvent Extraction and Ion Exchange
Volume8
Issue number3
DOIs
StatePublished - Jan 1 1990

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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