EXTRACTION OF GALLIUM(III) AND ALUMINUM(III) FROM ALKALINE-SOLUTIONS BY THE PYROCATECHOL DERIVATIVES

The ability to extract gallium (III) and aluminium (III) from aqueous sodium solution by the derivatives of pyrocatechol and 2,3-dihydroxyna phtalene has been investigated. Gallium (III) was extracted in quantit y from 1-6 mol/dm3 NaOH by 4-alkilpyrocatechols having ten carbon atom s. The ability to extract ortho-derivatives of pyrocatechol has been i nvestigated. Ortho-iso-propyl, ortho-tret-buthyl groups wese proved to decrease te ability to extract pyrocatechols. Similar effect for the 1,4-di(piperidylmethyl)-2,3-dihydroxynaphthalene was observed. Piperid ylmethyl groups suppress the formation of micellas.