Abstract
Technology used to produce high purity anhydrous rubidium perrhenate on an industrial scale from high purity perrhenic acid and rubidium nitrate by the ion-exchange method is described in this paper. This material is dedicated to catalyst preparation, therefore, strict purity requirements have to be fulfilled. These are satisfied by combining rubidium ion sorption on an ion exchange column and the subsequent elution of the high purity perrhenic acid solution, followed by crystallization, evaporation, purification, and drying. In the current study, rubidium and rhenium contents were found to be 22.5 wt.% and 55.4 wt.%, respectively, while contaminations were as follows: <2 ppm As, <2 ppm Bi, <5 ppm Ca, <5 ppm Cu, <3 ppm Fe, <10 ppm K, <3 ppm Mg, <5 ppm Mo, <2 ppm Na, <5 ppm Pb, and <3 ppm Zn.
Highlights
Preparation methods of rubidium perrhenate are poorly described in scientific databases.In particular, there is no information on the industrial scale production of this compound
Preparation is generally based on the neutralization of perrhenic acid solution by rubidium carbonate or hydroxide in equimolar amounts, resulting in the precipitation of rubidium perrhenate [4,5]
The post-washing solutions from elution were divided into two parts—the first was combined with the solution subjected to concentration, while the other, was mixed with mother liquors and post-purification solutions and sent for rubidium perrhenate preparation (>40 nm)
Summary
Preparation methods of rubidium perrhenate are poorly described in scientific databases. Perrhenate, chromium(III) perrhenate, and cesium perrhenate production and has been described in past works [8,9,10,11] This method (for nickel(II) and cobalt(II)) has been implemented in industry practice. The obtained high-purity materials may be used for the production of inorganic and organic Re compounds, like catalysts, e.g., methyltrioxorhenium (MTO), rhenium carbonyl (Re2 (CO)10 ), and its derivatives [12,13]. It may be an important additive to heterogeneous (e.g., Al2 O3 - or SiO2 -based) catalysts [14,15,16,17]. Unnecessary components, like nitrate and ammonium ions, are eliminated
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