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Polyphosphoric acid
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Molecular formula: H6P4O13
Molecular weight: 337.93
· Classification and numbering of hazardous regulations:
GB8.1 Class 815052. Original iron standard: Grade II inorganic acidic corrosive substance, 93007
· Use:
Used as cyclization and acylation agents, analytical reagents, and substitutes for orthophosphate in organic synthesis.
· Physical and chemical properties:
Colorless transparent viscous liquid. Easy to deliquescent, non crystalline, soluble in water and hydrolyzed into orthophosphate.
· Dangerous characteristics:
Not flammable. But contact with H pore forming agent can cause combustion. Not very corrosive. Hydrolysis into orthophosphate upon contact with water.
· Emergency measures and firefighting methods:
Use water to extinguish the fire. And use misty water to keep the fire container cool. First aid: Prevent phosphoric acid from coming into contact with the skin and splashing into the eyes to prevent serious burns to the skin and corrosion of the eyes. The patient should be removed from the contaminated area, immediately take off their clothes, rinse their skin and eyes with plenty of water, and apply magnesium oxide glycerin ointment on the skin. If there are burns, they should be sent to the hospital for treatment. Immediately rinse your mouth and drink magnesium milk if ingested by mistake, and urgently seek medical treatment.
· Storage and transportation conditions:
Corrosive products. Packaging method: Class (III). Plastic drums or glass bottles are wrapped in wooden boxes and lined with non combustible materials. Storage and transportation conditions: Store in a dry and cool place. It is strictly prohibited to store and transport together with alkaline substances, drugs, and their perishable products. Operators must wear acid resistant protective equipment. Leakage handling: Gas masks and gloves must be worn for handling leaked materials. Sprinkle sodium carbonate on the polluted ground, rinse with water, and dilute the wastewater into the wastewater system.
· Specifications and quality indicators:
| Item | Index | |
| Food grade | Industrial grade | |
| Content | ≥117% | ≥115—116% |
| P2O5 % | ≥85% | ≥83—84% |
| Chloride | ≤0.001 | ≤0.001 |
| Sulfate radical | 0.002 | 0.01 |
| Viscosity | 35000 | 35000 |
| Chroma | 20 | 50 |
| Pb % | ≤0.001 | ≤0.01 |
| Fe % | ≤0.001 | ≤0.01 |
| As % | ≤0.0050 | ≤0.01 |
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