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Hollow‐fiber dispersion‐free extraction and stripping of Pb(II) in the presence of Cd(II) using D2EHPA under recirculating operation mode
Author(s) -
Escobar Armando,
Schimmel Keith A,
de Gyves Josefina,
de San Miguel Eduardo Rodríguez
Publication year - 2004
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1004
Subject(s) - stripping (fiber) , extraction (chemistry) , chemistry , aqueous solution , hollow fiber membrane , chromatography , enrichment factor , stoichiometry , dispersion (optics) , partition coefficient , contactor , fiber , analytical chemistry (journal) , mass transfer , kerosene , aliquat 336 , solvent extraction , materials science , detection limit , organic chemistry , power (physics) , physics , optics , quantum mechanics , composite material
Lead(II) and cadmium(II) solvent extraction (SX) with D2EHPA dissolved in heptane and kerosene from aqueous chloride media was studied. Extraction reaction stoichiometries and extraction equilibrium constants were evaluated. Application of a dispersion‐free membrane‐based extraction and stripping technique with two hollow‐fiber contactors under recirculating operation mode allowed a quantitative (>97%) removal of lead from the aqueous solution in the extraction module with a separation factor of 19 and a 62% recovery in the back‐extraction module with a separation factor of 6.3 after 7 h under optimum conditions. Mass‐transfer coefficients for the system were evaluated. Optimal conditions for transport and separation are reported and compared using SX and the membrane‐based technique. Copyright © 2004 Society of Chemical Industry