Effect of diluents on extraction behavior of rare earth elements with N,N,N′,N′-tetrabutyl-3-oxy-glutaramide from hydrochloric acid

The extraction of rare earth elements with N,N,N′,N′-tetrabutyl- 3-oxy-glutaramide (TBDGA) in different diluents from hydrochloric acid medium was investigated to evaluate the effect of diluent on the distribution ratio and the stoichiometry of extracted species. The extraction capacity of TBDGA in different diluents for lanthanides increases in the order: toluene < n-octane < CCl4 < CHCl3. The effect of hydrochloric acid concentration, extractant concentration, and temperature on the distribution of rare earth elements was also studied.

M3 + 3CL−nTBDGA ⇌ MCL3 ⋅ nTBDGAn is different in various diluent systemsFigure optionsDownload as PowerPoint slideHighlights
► The rare earth elements can be extracted effectively from chloride solution by TBDGA.
► The extraction capacity increases in the order: toluene < n-octane < CCl4 < CHCl3.
► The distribution ratio increases with the concentrations of TBDGA and HCl.
► The stoichiometries of the extracted species are different in various diluents.
► TBDGA has better affinity for heavy lanthanides.