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Send EmailPhosphorus Pentoxide, Phosphoric Pentoxide, P2O5, 1314-56-3
CAS: 1314-56-3
Molecular Formula: O5P2
Names and Identifiers
| Name | Phosphorus pentoxide |
| Synonyms | P2O5 Phosphorus(Ⅴ)oxide Phosphorus(V) oxide Phosphoric anhydride Phosphorus pentoxide Phosphoric Pentoxide phosphorusoxide(p2o5) phosphorusoxide[p2o5] Phosphorous Pentoxide phosphoruspentoxide101 diphosphorus pentaoxide Phosphorusoxidewhitepowder Phosphorous Pentoxide (P2O5) phosphorus pentoxidedessicant PhosphorusVoxideACSwhitepowder phosphorus pentoxide for high purity 1,3-dioxodiphosphoxane-1,3-diium-1,3-diolate tricyclo[3.3.1.1~3,7~]tetraphosphoxane 1,3,5,7-tetraoxide |
| CAS | 1314-56-3 |
| EINECS | 215-236-1 |
| InChI | InChI=1/O5P2/c1-6(2)5-7(3)4 |
| InChIKey | YWEUIGNSBFLMFL-UHFFFAOYSA-N |
Physico-chemical Properties
| Molecular Formula | O5P2 |
| Molar Mass | 141.94 |
| Density | 2.3 g/mL at 25 °C (lit.) |
| Melting Point | 340 °C (lit.) |
| Boling Point | 122 °C (1 mmHg) |
| Flash Point | 340-360°C |
| Water Solubility | Soluble in sulfuric acid. Insoluble in acetone and ammonia. Decomposes in water. |
| Solubility | Soluble in sulfuric acid. Insoluble in acetone and ammonia. |
| Vapor Presure | 1 mm Hg ( 384 °C) |
| Vapor Density | 4.9 (vs air) |
| Appearance | Very Deliquescing Powder |
| Specific Gravity | 2.39 |
| Color | White |
| Odor | Pungent odour |
| Merck | 14,7355 |
| PH | 1 (5g/l, H2O, 20℃) |
| Storage Condition | no restrictions. |
| Stability | Stability Stable, but reacts violently with water, alcohols, metals, sodium, potassium, ammonia, oxidizing agents, HF, peroxides, magnesium, strong bases. |
| Sensitive | Moisture Sensitive |
| Refractive Index | 1.433-1.436 |
| Physical and Chemical Properties | Character white monoclinic crystal or powder. melting point 580~585 ℃ relative density 2.39 solubility: it is soluble in water to produce phosphoric acid and release a lot of heat, and soluble in sulfuric acid. Insoluble in acetone and ammonia. |
| Use | Used as a desiccant, dehydrating agent, sugar, and used for the preparation of phosphoric acid, phosphorus compounds and aerosols It is used as the doping source of semiconductor silicon, dehydration desiccant, organic synthesis condensing agent and surfactant, and also used in the preparation of high purity phosphoric acid |
Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | 35 - Causes severe burns |
| Safety Description | S22 - Do not breathe dust. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 1807 8/PG 2 |
| WGK Germany | 1 |
| RTECS | TH3945000 |
| FLUKA BRAND F CODES | 3-10 |
| TSCA | Yes |
| HS Code | 2809 10 00 |
| Hazard Class | 8 |
| Packing Group | II |
Upstream Downstream Industry
| Raw Materials | White phosphorus |
| Downstream Products | Diethyl chlorothiophosphate 2-Chloro-5-chloromethylpyridine Trichloroacetonitrile aminoglutethimide Amitriptylinehydrochloride Ammonium polyphosphate |
Nature
white monoclinic crystals or powders. Relative density 2. 30 I melting point 340 ℃,360℃ sublimation. Soluble in sulfuric acid, insoluble in ammonia and acetone. Contact with water to generate phosphoric acid and release a large amount of heat, and organic matter will burn. Corrosive to the skin. Exposure to organic matter may cause combustion risk. Heat or water in case of liberation of heat, release of toxic corrosive smoke. Highly corrosive.
Preparation Method
oxidation method: after the yellow phosphorus is heated and melted, it is sent to the oxidation combustion furnace, and the dry air (dehydrated by concentrated sulfuric acid) is used to carry out the oxidation combustion reaction, and the phosphorus pentoxide is sublimated by heating, the final product of phosphorus pentoxide is prepared in the sedimentation chamber which falls into the bottom of the oxidation combustion furnace when the furnace top is cold. The exhaust gas from the oxidation combustion furnace was passed through a cyclone separator to recover phosphorus pentoxide dust. The recovered product is packaged as a finished product along with the product in the settling chamber.
Use
It is used as a raw material for producing high-purity phosphoric acid, phosphates and phosphate esters, and is also used for the production of phosphorus pentoxide Sol and H-type aerosol. It can be used as a drying agent for gas and liquid, and a dehydrating agent for organic synthesis. Antistatic agents for synthetic fibers and refined preparations of sugars. It is also used in the manufacture of optical glass, UV-transparent glass, heat-insulating glass, microcrystalline glass and opaque glass, etc., to improve the dispersion coefficient of glass and the ability to transmit UV light. Also used in the production of pharmaceuticals, pesticides, surfactants.
Safety
It is irritant to skin and mucous membrane. The maximum allowable concentration is 1mg/ma. The production site should be well ventilated, and the staff should be well protected. If the skin is accidentally touched, it should be washed with water immediately. Should be stored in a cool, ventilated, dry warehouse. The container must be sealed. It is not allowed to be stored and mixed with flammable articles, Organic Articles, oxidants, etc. Moisture and water should be isolated. During the transport process, it is necessary to prevent rain, moisture and sun exposure. When there is a fire, it is not possible to use water to put out the fire. It can be used with dry yellow sand and dry powder, but it is not possible to use water.
Reference Information
| pH range of acid-base indicator | |
| sublimation point | 340-360°C |
| Overview | phosphorus pentoxide, also known as phosphoric anhydride, is a phosphorus oxide generated by the combustion of white phosphorus, yellow phosphorus or red phosphorus in dry air, white soft powder or colorless monoclinic crystal at room temperature, easy to deliquescence, melting point 580~585 ℃, relative density of 2.39, sublimation at 347 ℃. Upon heating to 563 ° C. Under pressure, the crystals were converted into amorphous glass-like bodies (melted). Insoluble in acetone, ammonia, soluble in sulfuric acid. It is easy to absorb moisture in the air, easy to absorb water, and has a strong dehydration, and even can be concentrated sulfuric acid dehydration, sulfur trioxide, is a strong desiccant, and water reaction, release heat and white smoke, release 68 kcal per mole of phosphorus pentoxide, usually with cold water to generate metaphosphoric acid, and hot water to generate orthophosphoric acid, according to the amount of water added to generate different pentavalent phosphorus oxyacid, such as metaphosphoric acid, pyrophosphoric acid, orthophosphoric acid and so on. |
| Application | phosphorus pentoxide is a common raw material and reagent in the chemical industry, which is widely used in medicine, coating additives, antistatic agent, chemical industry and other industries, mainly used in the manufacture of high purity phosphoric acid, gas and liquid desiccant, organic synthesis of dehydrating agent, and the preparation of organic phosphoric acid ester. |
| hazard category | Category 8.1 acid corrosion products |
| hazard characteristics | non-combustible. However, when water and organic matter such as wood, cotton or grass occur intense reaction heat release, can cause combustion. Water can occur a lot of smoke and heat, when the tide, the majority of metal slightly corrosive. Local irritation is very strong, steam and dust can seriously stimulate the eyes, mucous membranes, skin and respiratory system. And corrosion of skin and mucosa. Even dust at a concentration of 1mg/m3 was difficult to tolerate. |
| reference quality standard | project Index chemical pure analytical pure specific grade content (phosphorus pentoxide) ≥ 99% ≥ 99.5% ≥ 99.5% active R value: 1.2 1.7 2.0 reductant (calculated as P2O3) ≤ 0.02% ≤ 0.01% ≤ 0.005% ≤ 0.02% of qualified water-insoluble matter ≤ 0.01% ≤ 0.01% ≤ 0.002% of total nitrogen (N) ≤ 0.001% ≤ 0.001% ≤ of heavy metals (Pb) ≤ 0.002% ≤ 0.001% ≤ 0.001% iron content (Fe) ≤ 0.002% ≤ 0.001% ≤ 0.001% ≤ 0.01% arsenic content (As) ≤ 0.005% ≤ 0.0025% ≤ |
| react with water | and react with cold water to produce extremely toxic metaphosphoric acid: P2O5 H2O = 2HPO3 and react with hot water, generation of non-toxic orthophosphoric acid: P2O5 3H2O = (heated) 2H3PO4, exothermic reaction, the phenomenon is not very severe. |
| toxicity | the smoke of phosphorus pentoxide irritates the mucosa. Has a irritating and burning effect on the skin (tissue dehydration). The maximum allowable concentration is 1mg/rn3. Production equipment and piping should be closed and well ventilated. Production workers should wear protective equipment, wear anti-virus masks, and wear gas masks when they have phosphorus pentoxide vapor and smoke. Pay attention to protect the skin, do not enter and touch the eye. If the skin is touched, it should be immediately rinsed with water. |
| water absorption | has a strong water absorption, easy deliquescence in the air, corrosive to the skin, the maximum allowable concentration in the workplace is 1mg/m3. The drying efficiency of phosphorus pentoxide is 0.00001 K when the content of water vapor is 1 cubic meter of 0.00001 grams, that is, after drying by phosphorus pentoxide, up to grams of water per cubic meter of air, phosphorus pentoxide can make sulfuric acid, nitric acid dehydration. When the amount of phosphorus pentoxide and water species is 1:6, phosphorus pentoxide can be converted to orthophosphoric acid. |
| Use | used as a desiccant, dehydrating agent, sugar concentrate, and for the preparation of phosphoric acid, phosphorus Compounds and aerosols used as doping source of silicon semiconductor, dehydration desiccant, organic synthesis condensing agent and surfactant, also used in the preparation of high purity phosphoric acid used for the production of high purity phosphoric acid, the raw materials of phosphate and phosphate are also used in the manufacture of phosphorus pentoxide Sol and H-type aerosol. It can be used as a drying agent for gas and liquid, and a dehydrating agent for organic synthesis. Antistatic agents for synthetic fibers and refined preparations of sugars. It is also used in the manufacture of optical glass, UV-transparent glass, heat-insulating glass, microcrystalline glass and opaque glass, etc., to improve the dispersion coefficient of glass and the ability to transmit UV light. Also used in the production of pharmaceuticals, pesticides, surfactants. as a semiconductor dopant, it is a raw material for the preparation of high purity phosphoric acid. desiccant and dehydrating agent. Organic synthetic condensing agent. High-purity grade dopants for drawing optical fiber preforms, N-type dopants for integrated circuit fabrication, synthesis of optical crystals. |
| production method | using reagent-grade phosphorus pentoxide as raw material, it is purified by calcination and sublimation in a fully dried oxygen gas stream, the high-purity phosphorus pentoxide product was prepared by collecting the sublimated product through the condenser. after the yellow phosphorus is heated and melted by the oxidation method, it is sent to the oxidation combustion furnace, and the dry air (dehydrated by concentrated sulfuric acid) is used to carry out the oxidation combustion reaction, and the phosphorus pentoxide is sublimated by heating, the final product of phosphorus pentoxide is prepared in the sedimentation chamber which falls into the bottom of the oxidation combustion furnace when the furnace top is cold. The exhaust gas from the oxidation combustion furnace was passed through a cyclone separator to recover phosphorus pentoxide dust. The recovered product is packaged as a finished product along with the product in the settling chamber. P4 5O2 → 2P2O5 |
| category | corrosive article |
| toxicity grade | high toxicity |
| Acute toxicity | inhalation-rat LC50:1217 mg/cm/1 hour; Inhalation-mouse LC50:271 mg/nm/1 h |
| flammability hazard characteristics | Water smoke |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from alkalis and combustibles |
| fire extinguishing agent | dry sand, dry soil; No water |
| Occupational Standard | TWA 1 mg/m3; Tel 2 mg/m3 |
