Hot Selling Potassium Phosphonate Fungicide Phosphorous Acid With Factory Prices
Model Number : HMHT0040-8
Other Names : PA ; PPA ;Phosphonic Acid ; Hydrogen Phosphonate
Molecular Formula : H3PO3
Molecular Weight : 82.00
H.S. CODE NO.: 2811199090
EINECS NO.: 237-066-7
Solubility: Easily soluble in water
CAS NO.: 13598-36-2
UN NO.: 2834
|Product name||phosphoric acid|
|Corrosive||easily soluble in water|
|Application||It is widely used as a raw material for the manufacture of phosphites, as a raw material for the manufacture of plastic stabilizers in the plastics industry, as a reducing agent in chemical reactions, and also in the synthetic fiber and pesticide industries.|
1. Slowly add phosphorus trichloride dropwise to the water while stirring, control the dripping speed so that the reaction is not too intense, and cool the reactor with ice water. After the reaction is completed, filter, heat and evaporate the filtrate below 140°C to one third of the original volume to drive off the hydrogen chloride gas, then cool to 60-85°C, add a small amount of phosphorous acid crystals as crystal seeds, and further cool and crystallize under stirring , the system of phosphorous acid. Its reaction formula is as follows:
PCI3+ 3H2O → H3PO3+ 3HCl
2. Take a 1000mL three-necked round-bottomed flask and install it with a mechanical stirrer, dropping funnel and condenser (the outlet is connected to an HCl absorber). Put distilled water in the flask and cool with ice. 100 mL of freshly distilled PCl3 (boiling range 74-76°C) was slowly added from the dropping funnel with stirring. Filter and evaporate the filtrate to 1/3 of the original volume at below 140°C. Cool to 60-65°C, sprinkle H3PO3 crystal grains as seed crystals, cool and crystallize under stirring. Yield about 63g. For further purification, 10g of the product can be dissolved in 3.5g of water first, then all the rest of the product is added, stirred carefully, and crystallized by suction filtration, the yield is 40g. Put in a ground glass jar.
3. The device is the same as above, take 300 mL of CCl 4 and 100 g of newly steamed PCl 3 into the flask, cool with ice, and slowly add 75 g of distilled water dropwise from the dropping funnel under stirring. After all the water was added, the water bath was removed, and stirring was accelerated for 1 h. The reaction was transferred to a separatory funnel and washed with four times the amount of CCl4 (if crystals were precipitated, add 2-3 mL of water). The washed acid solution was filtered through a glass funnel and transferred to a flask. Under reduced pressure, it was evaporated on a water bath (not exceeding 60 °C) and HCl was removed for 3 h. Then put it into a desiccator to cool and crystallize.
Reduction of sulfuric acid to sulfur dioxide
Used as reducing agent in chemical reactions
It is the raw material of organophosphorus water treatment chemicals
Used as nylon brightener
For synthetic fibers
It is a chemical additive
It is a pesticide intermediate
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