Extraction of gallium(III) from hydrochloric acid solutions by trioctylammonium-based mixed ionic liquids.
The extractabilities of aluminium(III), gallium(III), and indium(III) from hydrochloric acid solutions were investigated using a mixture of two protic ionic liquids, trioctylammonium bis(trifluoromethanesulfonyl)amide ([TOAH][NTf(2)]) and trioctylammonium nitrate ([TOAH][NO(3)]).  At a HCl concentration of 4 mol L(-1) or more, gallium(III) was nearly quantitatively extracted and the extractability order was Ga > Al >> In.  The extractability of gallium(III) increased with increasing [TOAH][NO(3)] content in the mixed ionic liquid.  The extracted gallium(III) was quantitatively stripped with aqueous nitric acid solutions.  The separation and recovery of gallium(III) from hydrochloric acid solutions containing excess indium(III) was demonstrated using the mixed ionic liquid.
Department of Chemistry, Graduate School of Science, Chiba University, Chiba 263–8522, Japan. katsuta@faculty.chiba-u.jp
Shoichi
S
Katsuta
Miho
M
Okai
Yuki
Y
Yoshimoto
Yoshihiro
Y
Kudo
D000535:Aluminum / Q000302:isolation & purification; D005591:Chemical Fractionation / Q000379:methods*; D005708:Gallium / Q000302:isolation & purification*; D006851:Hydrochloric Acid / Q000737:chemistry*; D007204:Indium / Q000302:isolation & purification; D052578:Ionic Liquids / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012996:Solutions
D052578:Ionic Liquids; D000644:Quaternary Ammonium Compounds; D012996:Solutions; D007204:Indium; C037759:trioctylmethylammonium; D005708:Gallium; D000535:Aluminum; D006851:Hydrochloric Acid