Separation of Mo from Chloride Leach Liquors of Petroleum Refining Catalysts by Ion Exchange

Abstract

Separation of molybdenum from the synthetic chloride leach liquors of spent hydrodesulphurization catalysts was studied by employing cationic (Diphonix) and anionic resins (AG1-x8). The composition of the solution was Mo 394 ppm, Co 119 ppm and Al 1782 ppm. In the HCl concentration range from 1 to 6 kmol/m³, the loading of Co and Al was negligible. As the concentration of HCl increased, the loading percentage of Mo by AG1-x8 increased, while that by Diphonix decreased. The Mo in the loaded AG1-x8 was successfully eluted by using NaOH solution. In terms of the possibility of producing Mo compound from the eluant, AG1-x8 was found to be better than Diphonix. The loading capacity of AG1-x8 for molybdenum was determined. Column experiments verified that it was possible to separate Mo from Co and Al by ion exchange with AG1-x8.