Open AccessSolvent Extraction of Uranium (VI) by Didodecylphosphoric Acid
Author(s) -
Khaled Mousa,
Fawwaz I. Khalili
Publication year - 1999
Publication title -
maǧallaẗ ǧāmiʿaẗ al-sulṭān qābūs li-l-ʿulūm/sultan qaboos university journal for science
Language(s) - English
Resource type - Journals
eISSN - 2414-536X
pISSN - 2308-3921
DOI - 10.24200/squjs.vol4iss0pp15-21
Subject(s) - diluent , nitric acid , stripping (fiber) , chemistry , uranium , extraction (chemistry) , solvent , enthalpy , ionic strength , electrolyte , toluene , perchlorate , partition coefficient , solvent extraction , inorganic chemistry , ion , chromatography , nuclear chemistry , aqueous solution , organic chemistry , materials science , thermodynamics , electrode , metallurgy , composite material , physics
Solvent extraction of uranium(Vl) ion from perchlorate solution using didodecylphosphorie acid, DDPA, in toluene diluent was studied. The effects of stripping nitric acid concentration, stripping time, extraction time, DDPA concentration, pH, ionic strength, supporting electrolyte and temperature on the extraction processes have been studied. From the distribution coefficient values at different temperatures, the enthalpy, the free energy and the entropy changes associated with the extraction processes were determined. The composition of the complex formed was established to be UO2(CLO4)(HR2)(HR)2 where, (HR)2 represents the dimer of DDPA.