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 investigate d. The extractability of gallium(III) is appreciably dependent on the temperature and pressure of supercritical CO2. Gallium(III) was separa ted fairly selectively from aluminum(III) with HMO6Q into supercritica l CO2.