ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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

E-mail: Daria.Schrotterova@vscht.cz

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.

DOI: 10.2478/s11696-006-0078-9

Chemical Papers 60 (6) 427–431 (2006)