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The solution is milky white before the reaction, golden yellow in the early stage, and green in the later stage. During the reaction, the reaction solution should be kept boiling steadily, and water should be added to maintain the liquid level. The pH value in the later stage of the reaction should be controlled at about 1.0, and then the filter residue is removed by vacuum filtration. 30% hydrogen peroxide solution was added dropwise to the filtrate to make the solution change from green to yellow, then evaporated and concentrated to a temperature of 105°C, the solution was slowly cooled and crystallized, and finally centrifuged to obtain phosphomolybdic acid crystals. Phosphomolybdic acid is mainly used as an oxidation-reduction catalyst, such as direct oxidation of methane to formaldehyde, propylene oxidation to acrolein acetone, propylene ammoxidation to prepare acrylonitrile, etc. It is also used as a weighting agent for silk and leather. The raw materials and analytical r…

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