polyphosphoric acid
Polyphosphoric acid
CAS: 8017-16-1
Molecular Formula: (H)n+2.(P)n.(O)3n+1
polyphosphoric acid - Names and Identifiers
polyphosphoric acid - Physico-chemical Properties
| Molecular Formula | (H)n+2.(P)n.(O)3n+1 |
| Molar Mass | 337.93 |
| Density | 2.06 g/mL at 25 °C |
| Melting Point | -20°C |
| Boling Point | 550 °C |
| Water Solubility | MAY DECOMPOSE |
| Vapor Presure | 2 hPa (20 °C) |
| Appearance | Viscous Liquid |
| Specific Gravity | 2.06 |
| Color | Colorless |
| Merck | 14,7580 |
| pKa | 0.91[at 20 ℃] |
| Storage Condition | Store below +30°C. |
| Stability | Stable. Incompatible with strong bases. Hygroscopic. |
| Sensitive | Hygroscopic |
| Physical and Chemical Properties | Colorless transparent viscous liquid. Deliquescence. It can be miscible with water and hydrolyzed to orthophosphoric acid without crystallization. Corrosive. |
| Use | It is used as a cyclizing agent and acylating agent in organic synthesis, and is also a substitute for orthophosphoric acid. |
polyphosphoric acid - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | 34 - Causes burns |
| Safety Description | S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S25 - Avoid contact with eyes. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| UN IDs | 3264 |
| WGK Germany | 1 |
| TSCA | Yes |
| HS Code | 28092000 |
| Hazard Class | 8 |
| Packing Group | III |
polyphosphoric acid - Upstream Downstream Industry
| Raw Materials | Phosphoric acid |
polyphosphoric acid - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| What is polyphosphoric acid | polyphosphoric acid is simply a polymer of phosphoric acid. More than 100% of the phosphoric acid is generally referred to as polyphosphoric acid. Transparent viscous liquid, with the increase of the content, the greater the viscosity, 115% polyphosphoric acid glass-like viscous matter. The viscosity of Polyphosphoric acid will be reduced by heating, so it is necessary to heat the polyphosphoric acid before it is used in some industrial applications so that it can be produced normally after it has fluidity. polyphosphoric acid is produced by dehydration and condensation of phosphoric acid (H3PO4) by heating. It can also be obtained by heating condensation after adding phosphorus pentoxide to pure water. It is a colorless and transparent syrup-like substance at room temperature. At low temperature, it is a strong glass-like, and the fluidity appears when heated to 50~60 °c. Easy deliquescence, miscible with water and hydrolysis to phosphoric acid. The concentration of Polyphosphoric acid can be expressed by two methods, one is expressed by P2O5%, and the other is expressed by H3PO4 as 100%, which is expressed by the content of H3PO4 in the polyphosphoric acid. The acidity of Polyphosphoric acid is weaker than that of nitric acid and sulfuric acid, and has no oxidation ability. Hygroscopicity and easy deliquescence. In case of H, the blowing agent can cause combustion. polyphosphoric acid is corrosive, which belongs to the bipolar inorganic acid corrosion articles. Polyphosphoric acid is a proton acid, which can dissolve a variety of low molecular and high molecular organic compounds. It is used as a water loss agent, a cyclizing agent, and an acylating agent in organic synthesis as a catalyst or a solvent for reactions such as condensation, cyclization, rearrangement, and substitution. Polyphosphates (PPE) are sometimes used to increase the solubility of Polyphosphoric acid in organic solvents. In addition, Polyphosphoric acid is also used as a substitute for orthophosphoric acid and an analytical reagent. |
| Use | is used as a compound cyclizing agent and an acylating agent in organic synthesis. It is also used as a substitute for orthophosphoric acid and an analytical reagent. used in organic synthesis, also used as a substitute for orthophosphoric acid used as a cyclizing agent and acylating agent in organic synthesis, and also a substitute for orthophosphoric acid mainly used as an analytical reagent, and can be used as organic synthesis of the ring condensation agent (chemical cyclizing agent) and acylating agent. |
| production method | synthesis method phosphoric acid and phosphorus pentoxide are heated for polymerization reaction, hydrogen peroxide is added to remove iron ions from the solution, and after purification, cooling, filtration, preparation of multi-phosphoric acid products. Its 2H3PO4 P2O5 → H6P4O13 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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View History
polyphosphoric acid
2-羟基-5-碘-3-甲氧基苯甲醛
2-甲氧基-3-硝基-4-吡啶甲醛
六(4-甲氧苄基)六氮杂异伍兹烷
Thionitrous acid (HNOS), S-[1-(hydroxymethyl)cyclohexyl] ester
2-羟基-3-硝基-5-氯吡啶
左旋沙丁胺醇相关杂质E(盐酸盐)
cis-8-eicosenoic acid methyl ester
2-(4-氨基-3-硝基苯基)乙酸
N-[(S)-(4-nitrophenoxy)phenoxyphosphinyl]-L-Alanine 2-ethylbutyl ester
2-羟基-5-碘-3-甲氧基苯甲醛
2-甲氧基-3-硝基-4-吡啶甲醛
六(4-甲氧苄基)六氮杂异伍兹烷
Thionitrous acid (HNOS), S-[1-(hydroxymethyl)cyclohexyl] ester
2-羟基-3-硝基-5-氯吡啶
左旋沙丁胺醇相关杂质E(盐酸盐)
cis-8-eicosenoic acid methyl ester
2-(4-氨基-3-硝基苯基)乙酸
N-[(S)-(4-nitrophenoxy)phenoxyphosphinyl]-L-Alanine 2-ethylbutyl ester
Raw Materials for polyphosphoric acid