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Phosphorus pentoxide

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Phosphorus pentoxide Basic information
Outline Risk category Hazardous characteristics Reference quality standards Reaction with water Toxicity Water absorption Chemical Properties Uses Production method Category Toxicity grading Acute toxicity Flammability hazard characteristics Storage Characteristics Extinguishing agent Occupational standards
Product Name:Phosphorus pentoxide
Synonyms:GRANULATED;DI-PHOSPHORUS PENTOXIDE;DIPHOSPHORUS PENTAOXIDE;EATON'S REAGENT;SICAPENT;SICAPENT(R);PHOSPHORIC ANHYDRIDE;PHOSPHORIC ACID ANHYDRIDE
CAS:1314-56-3
MF:O5P2
MW:141.94
EINECS:215-236-1
Product Categories:Inorganic Chemicals;Inorganics;element oxide;Organics;Phosphate
Mol File:1314-56-3.mol
Phosphorus pentoxide Structure
Phosphorus pentoxide Chemical Properties
mp 340 °C(lit.)
bp 122 °C (1 mmHg)
density 2.3 g/mL at 25 °C(lit.)
vapor density 4.9 (vs air)
vapor pressure 1 mm Hg ( 384 °C)
refractive index 1.433-1.436
Fp 340-360°C
storage temp. Store at RT.
Sensitive Moisture Sensitive
Merck 14,7355
Sublimation 340-360 ºC
Stability:Stability Stable, but reacts violently with water, alcohols, metals, sodium, potassium, ammonia, oxidizing agents, HF, peroxides, magnesium, strong bases.
CAS DataBase Reference1314-56-3(CAS DataBase Reference)
NIST Chemistry ReferenceDiphosphorus pentoxide(1314-56-3)
EPA Substance Registry SystemPhosphorus oxide (P2O5)(1314-56-3)
Safety Information
Hazard Codes C
Risk Statements 35
Safety Statements 22-26-45
RIDADR UN 1807 8/PG 2
WGK Germany 1
RTECS TH3945000
3-10
HazardClass 8
PackingGroup II
Hazardous Substances Data1314-56-3(Hazardous Substances Data)
MSDS Information
ProviderLanguage
SigmaAldrich English
ACROS English
ALFA English
Phosphorus pentoxide Usage And Synthesis
OutlineAlso known as phosphoric anhydride, phosphorus pentoxide is phosphorus oxides generated by combustion of white phosphorus, yellow or red phosphorus in dry air, soft white powder or colorless monoclinic crystal at room temperature, easily deliquescence, melting point is 580 ~ 585 ℃, relative density is 2.39, sublimation is 347 ℃. When heated under pressure to 563 ℃, crystalline substance translates to amorphous glass (melt). It is insoluble in acetone, ammonia, soluble in sulfuric acid. It is easy to absorb moisture in the air, easy to absorb moisture, and have a strong dehydration, can even dehydrate concentrated sulfuric acid to produce sulfur trioxide, is a potent desiccant, reacts violently with water and emits heat and white smoke. Per mole of phosphorus pentoxide releases 68 kilocalories, usually generate metaphosphate with cold water, and generate mainly phosphoric acid with hot water. According to the amount of water added, it can generate different pentavalent phosphorus oxyacid, such as metaphosphoric acid, pyrophosphoric acid, orthophosphoric acid, etc. It is used to make high purity phosphoric acid, as well as gas and liquid desiccant, organic synthetic dehydrating agent.
Risk categoryClass 8.1 acidic corrosive product
Hazardous characteristicsNon-combustible. But encountering water and organic materials such as wood, cotton or straw, it reacts violently to release heat, may cause a fire. Contacting Water, it can emit a lot of smoke and heat. The case of the moisture, it corrodes most metals slightly. A strong local irritation, vapor with dust can severely irritate the eyes, mucous membranes, skin and respiratory system, and corrode the skin, mucous membranes. Even the dust concentration of 1mg / m3, it is unbearable.
The above information is edited by the chemicalbook of Yan Yanyong.
Reference quality standardsItem Index
Chemically pure analytically pure specific level
Content (phosphorus pentoxide) ≥99% ≥99.5% ≥99.5%
Active R value 1.2 1.7 2.0
Reducing substances (in terms P2O3) ≤0.02% ≤0.01% ≤0.005%
Clarity test Pass Pass Pass
Water insoluble matter ≤0.02% ≤0.01% ≤0.01%
Total nitrogen (N) ≤0.002% ≤0.001% ≤0.001%
Heavy Metals (in Pb) ≤0.002% ≤0.001% ≤0.001%
Iron content (Fe) ≤0.002% ≤0.001% ≤0.001%
Arsenic content (As) ≤0.01% ≤0.005% ≤0.0025%
Reaction with waterIt reacts with cold water to produce extremely toxic metaphosphate: P2O5 + H2O = 2HPO3
and reacts with hot water to produce ontoxic orthophosphate: P2O5 + 3H2O = (heating) 2H3PO4, an exothermic reaction, the phenomenon is not very intense.
ToxicityPhosphorus pentoxide smoke irritates mucous membranes, has irritation and burning effects for skin (tissue dehydration).
Maximum allowable concentration is 1mg / rn3.
Production equipment and pipelines should be closed, and maintain good ventilation. Production workers should wear labor protective equipments and wear protective respirator, when there are phosphorus pentoxide vapor and smoke , should wear protective masks. Pay attention to protect the skin, do not import, or meet the eye. If accidentally touches the skin, immediately wash with clean water.
Water absorptionThere is a strong water imbibition, and easily deliquescent in the air, corrosive to the skin. The maximum allowable concentration in the workplace is 1mg / m3. The drying efficiency of Phosphorus pentoxide is 1 cubic meter 0.00001 grams of water vapor content at 298K, namely dried by phosphorus pentoxide, water left per cubic meter of air is up to 0.00001 gram, phosphorus pentoxide can make sulfuric acid, nitric acid dehydration. When the amount of phosphorus pentoxide and water substance is 1: 6, phosphorus pentoxide can convert to orthophosphoric acid.
Chemical PropertiesWhite monoclinic crystal or powder. Dissolved in water to produce phosphoric acid and release a lot of heat, dissolved in sulfuric acid. Insoluble in acetone and ammonia.
UsesUsed as a drying agent, dehydrating agent, sugar refining agent, and used for the preparation of phosphoric acid, phosphorous compounds and aerosol, etc. Used as a semiconductor silicon doped source, dehydration drying agent, organic synthetic condensing agent and surfactant, it is also used for preparation of high purity phosphoric acid.
It is used as raw material for the production of high purity phosphoric acid, phosphates and phosphate, also used for the preparation of phosphorus pentoxide sol and H-based aerosol. It can be used as a desiccant of gases and liquids, dehydrating agent for organic synthesis, antistatic agents of synthetic fiber and sugar refining agent. It is also used in the manufacture of optical glass, UV transparent glass, insulating glass, microcrystalline glass and opaque glass, etc, so as to improve the dispersion coefficient and UV light through ability of the glass. Also used in the production of pharmaceuticals, pesticides, surfactants.
It is used as the semiconductor dopant, and raw material for the preparation of high purity phosphoric acid.
It is used as desiccant and dehydrating agent, condensing agent in organic synthesis. High purity grade phosphorus pentoxide can be used as dopant for drawing optical fiber preform, N type dopant for the manufacture of integrated circuits, used for the synthesis of optical crystal.
Production methodReagent grade phosphorus pentoxide is as raw material, purified by burning sublimation in sufficiently dry oxygen gas stream, trapping sublimate by the condenser, to obtain high-purity phosphorus pentoxide products.
Yellow phosphorus is heated and melted by oxidation method, transfered to the oxidation furnace for oxidation combustion reaction with dry air (via dehydration of concentrated sulfuric acid), phosphorus pentoxide produced is sublimated by heat, cold in the top of burners and falls into interior settling chamber at the bottom, to prepare pentoxide products.
Exhaust escapes from the oxidation furnace to a cyclone to recover phosphorus pentoxide dust. Recycling and the settling chamber finished product are together packaged as a finished product. P4 + 5O2 → 2P2O5
CategoryCorrosive materials
Toxicity gradingHighly toxic
Acute toxicityInhalation - rat LC50: 1217 mg / m3 / 1 hour, Inhalation - Mouse LC50: 271 mg / m3 / 1 hour
Flammability hazard characteristicsContacting water to produce Smoke.
Storage CharacteristicsTreasury ventilation low-temperature drying, stored separately from oxidants
Chemical PropertiesWhite solid
Extinguishing agentDry sand, Dry soil, ban on water
Occupational standardsTWA 1 mg / cubic meter, STEL 2 mg / cubic meter
General DescriptionA white amorphous powder. Corrosive to metals and tissue and moderately toxic.
Air & Water ReactionsReadily absorbs moisture from the air forming a syrup of meta-, pyro-, and orthophosphoric acids. Reacts violently with water releasing considerable heat [Oldbury Chemicals, p. 9].
Reactivity ProfilePhosphorus pentoxide reacts violently and exothermically with water. The heat can ignite surrounding or admixed combustible materials. Undergoes hazardous or violent reactions with metal hydroxides and oxides, formic acid, hydrogen fluoride and hydrofluoric acid, iodides, metals (in particular potassium and sodium), oxidizing agents (bromine pentafluoride, chlorine trifluoride, perchloric acid, oxygen difluoride, hydrogen peroxide), ammonia, and proparygl alcohol. [Bretherick, 5th ed., 1995, p. 1781; EPA, 1998]. A violent explosion occurs if a solution of perchloric acid in chloroform is poured over phosphorus pentaoxide [EPA, 1998].
Health HazardPowder and fumes in the air are irritating to eyes and the respiratory tract. Particles in contact with eye react vigorously and even a small amount may cause permanent burns. Contact with the skin will cause severe burns. Ingestion will damage the gastrointestinal tract. Corrosive to skin, mucous membranes and eyes.
Fire HazardReacts violently with water to evolve heat. Flammable poisonous gases may accumulate in tanks and hopper cars. Phosphorus pentoxide reacts violently with the following: ammonia, hydrofluoric acid, oxygen difluoride, potassium, sodium, propargyl alcohol, calcium oxide, sodium hydroxide and chlorine trifluoride. A violent explosion occurs if a solution of perchloric acid in chloroform is poured over phosphorus pentoxide. Avoid formic acid, hydrogen fluoride, inorganic bases, metals, oxidants, water. Readily absorbs moisture from air to form meta-, pryo-, or orthophosphoric acid.
Tag:Phosphorus pentoxide(1314-56-3) Related Product Information
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