Solvent Extraction of PtCl<SUB>4</SUB> from Hydrochloric Acid Solution with Alamine336

Abstract

We have conducted solvent extraction of Pt(IV) from HCl solution with Alamine336. Solvent extraction reaction in our system was determined from the experimental results by graphical method. The equilibrium constant of the solvent extraction reaction was estimated from our experimental results by considering the activity coefficients of chemical species present in the aqueous phase with Bromley equation. Bromley interaction parameter between hydrogen ion and PtCl 2À 6 was evaluated from the solvent extraction data reported in the literature. Solvent extraction of PtCl 4 by Alamine336 and the corresponding equilibrium constant in our experimental range can be represented by PtClThe measured distribution coefficients of Pt(IV) agreed well with those calculated in this study.

Separation of Pt(IV) and Rh(III) from Chloride Solution by Solvent Extraction with Amine and Neutral Extractants

“…[4][5][6][7][8][9][10][11][12][13] TBP, TOPO, and DOS have been widely used in the separation of base metals together with PGMs 13,14) and in the refining of precious metals. 15,16) The existence form of PGMs and availability of certain type of metal species are highly dependent on the acidity and chloride concentration in the aqueous solution.…”

Trash or treasure? Sustainable noble metal recovery

“…At this stage, the pivotal aspect of the extraction agent is its efficiency and selectivity, crucial for expediting the successful separation of the target metal ions from other coexisting ones. Various organic solvents used to separate platinum group metals can be roughly divided into three categories: phosphorus-containing extractants, 72 nitrogen-containing extractants 73 and sulfur-containing extractants. 74 Because of variations in charge quantities within the platinum group and their distinct solid geometry structures, the central atomic charges in different metal chlorine complexes differ.…”

“…These series of extractants have notable chemical stability and high selectivity with platinum group metals. 72 Compared with the above extractants, sulfur-containing extractants typically exhibit greater stability in strong acid solutions. The sulfur atoms in the skeleton have a strong interaction with platinum group metals based on hard soft acid–base theory.…”

Adsorption and separation of palladium and platinum with microcapsules containing tri-n-octylamine hydrochloride

“…The use of polymeric materials that contain a selective extractant offers some advantage over the use of solvent extraction techniques [9][10][11]. Extractants having an amine or amide group, such as N,N-dihexyl cyanamide and alamine 336 [12,13] have been used for the recovery of platinum group metals. In this study, the adsorption equilibrium of palladium and platinum was measured using microcapsules containing tri-n-octylamine hydrochloride as an extractant and then attempted the separation of palladium and platinum with a column packed with the same microcapsules.…”