MOLYBDENUM RECOVERY

摘要

MOLYBDENUM RECOVERY A process for recovery of molybdenum from residual fractions derived from an epoxidation reaction of propylene with tertiary butyl hydroperoxide in liquid phase with tertiary butyl alcohol, in the presence of soluble molybdenum, which process comprises: Fractionating epoxidation reaction product for obtaining a liquid fraction containing essentially all molybdenum from the reaction product; Contacting the liquid fraction with anhydrous ammonia for forming a precipitate containing the major portion of the molybdenum and a liquid phase containing 500 ppm or less molybdenum; Separating the liquid phase from the precipitated solid; Evaporating the liquid phase under conditions of elevated temperatures and reduced pressure in the presence of 1 to 3 % water for separation into an evaporator overhead vapor essentially free of molybdenum and an evaporator concentrate comprising essentially all of the molybdenum fed to the evaporator; Rapidly cooling evaporator concentrate from about evaporation temperature to about room temperature or less for converting the evaporator concentrate into a brittle, fracturable solid which is easier to accumulate and dispose of in an environmentally acceptable manner.