ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Extraction of Re(VII) by neutral and basic extractants
D. Schrötterová and P. Nekovář
Department of Inorganic Technology, Institute of Chemical Technology Prague, CZ-166 28 Prague, Czech Republic
Received: 21 April 2006 Revised: 30 June 2006 Accepted: 9 July 2006
Abstract: The mechanism of Re(VII) extraction from sulphate-containing solutions using primary amine Primene JMT, trioctylphosphine oxide (TOPO), tributyl phosphate (TBP), and their mixtures was investigated. It was found that the ratio of Re(VII) with Primene JMT and its sulphate in the organic phase was 1:1. The composition of Re(VII) complexes with TOPO depended on the acidity of solution ranging from about 1:1 to 2:1. When the extraction was carried out by TBP the mole ratio of TBP to Re was approximately 4. Primene JMT proved to be the most suitable agent for Re(VII) extraction with the exception of strongly acidic solutions, in which TOPO provided better results. The mixed solvents Primene JMT and TOPO as well as Primene JMT and TBP presented a slight synergism in weakly acidic solutions.
Keywords: extraction - equilibrium - rhenium(VII) - sulphate solution - amine - organic phosphates
Full paper is available at www.springerlink.com.
Chemical Papers 60 (6) 427–431 (2006)