Extraction and separation of Pt(IV)/Rh(III) from acidic chloride solutions using Aliquat 336

Recovery of platinum from spent catalysts by liquid–liquid extraction in chloride medium

“…Some extractants for platinum from spent samples or standard chloride solutions have been reported in the last years, but these extractants fall into only two basic groups: (i) organophosphorus compounds such as tributyl phosphate (TBP) [16], 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) [17], try-octyl phosphine oxide (Cyanex 921) [6,18] and bis(2,2,4-trimethyl-pentyl)monothiophosphinic acid (Cyanex 302) [19]; (ii) amines such as tri-octyl/decylamine (Alamine 308) [15], tri-octyl/decylamine (Alamine 336), [16,20] mixtures of trioctylamine and tridecylamine [21] and ammonium quaternary salts such as Aliquat 336 [22]. Amines are of interest because Pt can be extracted without the interference of metals such as Fe and Al [15,20].…”

“…It can be readily decomposed by calcination or gaseous reduction at high temperature; sponge-like Pt metal is the final product [20]. Other studies use stripping with Na 2 S 2 O 3 [21] or thiourea [15,19,22] in a single stage.…”

Quaternary Ammonium and Phosphonium Ionic Liquids in Chemical and Environmental Engineering

“…Further, Aliquat ® 336 could be efficiently applied for the recovery of Co and Ni from spent Ni-MH batteries (Nayl, 2010). Aliquat ® 336 dissolved in kerosene was also applied for the effective separation of Pt(IV) from Rh(III) from acidic chloride solutions (Lee et al, 2009). As Aliquat ® 336 was first applied as extractant in the mining industry, it is not surprising that numerous studies are dealing with the evaluation of its extraction ability towards uranium, thorium and several lanthanides (e.g.…”

Separation of Platinum(IV) and Rhodium(III) from Acidic Chloride Solution by Solvent Extraction with Tri 2-Ethylhexyl Amine(TEHA)

“…The spent catalysts produced from the petrochemical and automobile industries are important secondary resources for PGMs. In hydrometallurgical treatment of spent catalysts, PGMs together with other minor elements in the spent catalysts are dissolved by leaching with chloride based solutions 3) , and then the PGMs are recovered by solvent extraction with different extractants [4][5][6][7][8][9][10] or by ion exchange with various resins.…”