MOLYBDENUM TRIOXIDE PURIFICATION METHOD Russian patent published in 2017 - IPC C01G39/02 

FIELD: chemistry.

SUBSTANCE: molybdenum trioxide purification involves vacuum sublimation. prior to purification molybdenum trioxide is mixed with a d-element oxide. The resulting mix is calcined at a temperature of 650-700°C. Oxygen pressure is 0.2-1 atm. The calcined mix is then purified by vacuum sublimation at a temperature of 650-715°C, the purified molybdenum trioxide is precipitated at a temperature rise of 520-600°C. The vacuum sublimation is alternated with oxidation at the oxygen pressure of 0.1-0.4 atm.

EFFECT: reduced number of metal impurities in molybdenum trioxide, high content of molybdenum trioxide with a fixed stoichiometric deviation, high yield of the purified product, reduced waste.

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