Synthesis of perrhenic acid using solvent extraction

Recovery of rhenium from a molybdenite roaster fume as high purity ammonium perrhenate

“…c o m / l o c a t e / h y d r o m e t Hosseinzadeh et al, 2014). Quaternary ammonium salts (Aliquat 336), or mixtures of TOA and hexyl phosphine oxides (Cyanex 923) were also used to selectively extract Re over ammonium ions for the production of high purity perrhenic acid containing 300 g/L Re (with less than 100 ppm of ammonium, Na, K, Mg ions) (Leszczynska-Sejda et al, 2009). It's worth noted that for Re or Mo solvent extraction, the cotransfer of nitrate, chloride and sulphate from the aqueous to the organic phase (Shu and Yang, 2010;Xiong et al, 2008) would significantly interfere with the extraction or loading of Re (as ReO 4 − ) and Mo (as MoO 4 2− ) into the organic phase or resins.…”

Rhenium(VII) Compounds as Inorganic Precursors for the Synthesis of Organic Reaction Catalysts

“…Perrhenic acid of high purity, produced at the IMN using extraction as well as ion-exchange method (rhenium concentrations above 300.0 g/dm 3 ), was used as the source of rhenium in all experiments. Perrhenic acid contained 50-900g/dm 3 Re and <20 ppm ammonium ions, <2 ppm As; <2 ppm Bi, <3 ppm Zn, <3 ppm Mg, <3 ppm Cu, <5 ppm Mo, <5 ppm Ni, <5 ppm Pb, <10 ppm K, <3 ppm Ca, <3 ppm Fe, <3 ppm Al, <5 ppm Co [41,42,43,44]. High purity nitric acid (HNO 3 ) and 30% solution of hydrogen peroxide (POCH, Gliwice, Poland) were also used.…”

“…The production method of perrhenic acid depends on the planned further use of the mentioned perrhenates. It can be obtained either by ion-exchange method (for superalloy precursors production) [41,42,43] or by solvent extraction [44] (for catalyst preparation). Solutions from the elution step were mixed with the other one, e.g., obtained from the washing after elution, and directed for the evaporation (in case of Ni, Co, Cr, Cs, Rb, Al, Cu) or crystallization (in case of nano -Rb, nano -Cs).…”

Technology to Produce High-Purity Anhydrous Rubidium Perrhenate on an Industrial Scale

“…High-purity perrhenic acid, which was prepared using ion-exchange, solvent extraction, or ion-exchange methods at the IMN, was used as the source of rhenium [18,19,20,21]. Its purity was confirmed by quantitative analysis, which showed the following components: 100.0–500.0 g/dm 3 Re, <20 ppm NH 4 + , <3 ppm Al, <2 ppm As, <2 ppm Bi, <3 ppm Ca, <5 ppm Co, <3 ppm Cu, <3 ppm Fe, <10 ppm K, <3 ppm Mg, <5 ppm Mo, <5 ppm Ni, <5 ppm Pb, and <3 ppm Zn.…”