A kind of phosphotungstic acid secondary salt decomposition aid and preparation method
A technology of phosphotungstic acid and phosphotungstic heteropoly acid, which is applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of secondary pollution of the environment, the result and degree of environmental damage, and harsh operating environment, etc. less effect
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Embodiment １
[0034] Take 1200g of phosphotungstic heteropolyacid with Keggin structure, add 700g of soft water, dilute phosphotungstic heteropolyacid into phosphotungstic acid aqueous solution, take 400g of dilute sulfuric acid and 400g of urea into a reaction kettle with a stirring device and stir evenly, slowly and evenly When heating to 80-95°C, continue heating for 1-2 hours, then add the aqueous solution of phosphotungstic acid into the reaction kettle, heat slowly and evenly to 100-130°C, the heating time is 2-3 hours, and then put the obtained Take out the intermediate product, add calcium hydroxide to neutralize the excess sulfuric acid, then filter it with a centrifugal filter, take out the filtered product and put it in an electric heating box for heating, and synthesize it in solid phase at 140-160°C, the synthesis time After 3-4 hours, the intermediate product phosphotungstic acid mixture was obtained. After drying, crushing and grinding, the target product phosphotungstic acid ...
Embodiment 2
[0036] Take 1200g of phosphotungstic heteropolyacid with Keggin structure, add 700g of soft water, dilute phosphotungstic heteropolyacid into phosphotungstic acid aqueous solution, take 400g of dilute sulfuric acid and 400g of urea into a reaction kettle with a stirring device and stir evenly, slowly and evenly When heating to 80-95°C, continue heating for 1-2 hours, then add the aqueous solution of phosphotungstic acid into the reaction kettle, heat slowly and evenly to 100-130°C, the heating time is 2-3 hours, and then put the obtained Take out the intermediate product, add calcium hydroxide to neutralize the excess sulfuric acid, then filter it with a centrifugal filter, take out the filtered product and put it in an electric heating box for heating, and synthesize it in solid phase at 140-160°C, the synthesis time After 3-4 hours, the intermediate product phosphotungstic acid mixture was obtained, which was dried, pulverized and ground, with a particle size of 20 mesh, and ...
Embodiment 3
[0038] Take 1000g of phosphotungstic heteropolyacid with Keggin structure, add 600g of soft water, dilute phosphotungstic heteropolyacid into phosphotungstic acid aqueous solution, take 500g of dilute sulfuric acid and 400g of urea into a reaction kettle with a stirring device and stir evenly, slowly and evenly When heating to 80-95°C, continue heating for 1-2 hours, then add phosphotungstic acid aqueous solution into the reaction kettle, slowly and uniformly heat to 100-130°C, heating time is 2-3 hours, and then put the obtained intermediate Take out the product, add calcium hydroxide to neutralize excess sulfuric acid, then filter it with a centrifugal filter, take out the filtered product and put it in an electric heating box for heating, and synthesize it in solid phase at 140-160°C, and the synthesis time is 3 -4 hours, the intermediate product phosphotungstic acid mixture was obtained, after drying, crushing and grinding, the target product phosphotungstic acid auxiliary ...
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