Selective liquid-liquid extraction of palladium(II) from hydrochloric acid media by di-(2-ethylhexyl) thiophosphoric acid (DEHTPA)

Journal Article · Mon Mar 01 04:00:00 EST 1999 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299908934616· OSTI ID:343793

Rovira, M; Cortina, J L; Sastre, A M ^[1]

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1. Univ. Politecnica de Catalunya, Barcelona (Spain). Dept. of Chemical Engineering

Liquid-liquid extraction of Pd(II) from hydrochloric acid solutions using di-(2-ethylhexyl) thiophosphoric acid (DEHTPA or HL) dissolved in kerosene has been studied. The distribution equilibrium of DEHTPA between the aqueous phase and the organic phase was investigated by treating the data with the computer program LETAGROP-DISTR. The extraction of Pd(II) from HCl solutions by DEHTPA was studied as a function of several variables: equilibration time, organic phase diluent, HCl and DEHTPA concentrations as well as temperature. Experimental equilibrium data were analyzed numerically using the program LETAGROP-DISTR and the results showed that Pd(II) extraction can be explained assuming the formation of PdL{sub 2} complexes in the organic phase. DEHTPA was found to be selective for Pd(II) against Pt(IV), Rh(III), Cu(II), Fe(III) and Zn(II). The back-extraction of Pd(II) loaded in the organic phase using different stripping reagents is also reported.

• Sponsoring Organization: USDOE
• OSTI ID: 343793
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 2 Vol. 17; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COPPER
IRON
L CODES
ORGANIC SULFUR COMPOUNDS
PALLADIUM
PARAMETRIC ANALYSIS
PHOSPHORIC ACID ESTERS
PLATINUM
RHODIUM
SOLVENT EXTRACTION
ZINC