Optimization of molybdenum recovery from spent HDS catalysts using Cyanex ۲۷۲

The solvent extraction method was used for the recovery of molybdenum from the spent HDS (Hydrodesulfurization) catalysts. The required experiments were designed by RSM (Response Surface Methodology) method according to CCD (Central Composition Design), and four independent parameters were examined. The value of Mo recovery in different conditions showed that the effect of the leach solution acidity is insignificant at a low concentration of Cyanex ۲۷۲. The optimum value for Cyanex ۲۷۲ concentration, H+ concentration of leach solution, temperature, and Mo concentration was obtained ۰.۲۷ M, ۳.۴ M, ۳۰ ˚C, and ۲۷۹.۷۴ mg/L, respectively. The Mo recovery was ۹۹.۰۵% in these conditions, which had ۰.۷۴ error from the software predicted value.

Keywords:

Molybdenum , HDS catalysts , Solvent extraction , Response surface methodology.