Extraction behavior of gallium(III) with 2-methyl-5-hexyloxymethyl-8-quinolinol and 5-hexyloxymethyl-8-quinolinol from weakly acidic solution into supercritical CO2 and selective separation of gallium(III) from aluminum(III)

The extraction behavior of gallium(III) with 2-methyl-5-hexyloxymethyl-8-quinolinol (HMO6Q) and 5-hexyloxymethyl-8-quinolinol (HO6Q) (Figure 1) into supercritical CO2 from weakly acidic solution was investigated. The extractability of gallium(III) is appreciably dependent on the temperature and pressure of supercritical CO2. Gallium(III) was separated fairly selectively from aluminum(III) with HMO6Q into supercritical CO2.