| Identification | More | [Name]
Phosphorus pentoxide | [CAS]
1314-56-3 | [Synonyms]
DIPHOSPHORUS PENTAOXIDE
DI-PHOSPHORUS PENTOXIDE
EATON'S REAGENT
GRANULATED
PHOSPHONIC ANHYDRIDE
PHOSPHORIC ACID ANHYDRIDE
PHOSPHORIC ANHYDRIDE
PHOSPHOROUS PENTOXIDE
PHOSPHORUS(+5)OXIDE
PHOSPHORUS ANHYDRIDE
PHOSPHORUS OXIDE
PHOSPHORUS PENTAOXIDE
PHOSPHORUS PENTOXIDE
PHOSPHORUS PENTOXIDE DRYING AGENT
PHOSPHORUS(V) OXIDE
SICAPENT
SICAPENT(R)
anhydridephosphorique
NA 1807
oxide,pent-phosphoru | [EINECS(EC#)]
215-236-1 | [Molecular Formula]
O5P2 | [MDL Number]
MFCD00011440 | [Molecular Weight]
141.94 | [MOL File]
1314-56-3.mol |
| Chemical Properties | Back Directory | [Appearance]
Phosphorus pentoxide is a white crystalline solid. | [Melting point ]
340 °C (lit.) | [Boiling point ]
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. | [solubility ]
Soluble in sulfuric acid. Insoluble in acetone and ammonia. | [form ]
Very Deliquescing Powder | [color ]
White | [Specific Gravity]
2.39 | [Odor]
Pungent odour | [PH]
1 (5g/l, H2O, 20℃) | [PH Range]
<2 | [Stability:]
Stability Stable, but reacts violently with water, alcohols, metals, sodium, potassium, ammonia, oxidizing agents, HF, peroxides, magnesium, strong bases. | [Water Solubility ]
Soluble in sulfuric acid. Insoluble in acetone and ammonia. Decomposes in water. | [Sensitive ]
Moisture Sensitive | [Merck ]
14,7355 | [Sublimation ]
340-360 ºC | [InChIKey]
YWEUIGNSBFLMFL-UHFFFAOYSA-N | [CAS DataBase Reference]
1314-56-3(CAS DataBase Reference) | [NIST Chemistry Reference]
Diphosphorus pentoxide(1314-56-3) | [EPA Substance Registry System]
1314-56-3(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
C | [Risk Statements ]
R35:Causes severe burns. | [Safety Statements ]
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 label where possible) . | [RIDADR ]
UN 1807 8/PG 2
| [WGK Germany ]
1
| [RTECS ]
TH3945000
| [F ]
3-10 | [TSCA ]
Yes | [HazardClass ]
8 | [PackingGroup ]
II | [HS Code ]
28091000 | [Safety Profile]
Poison by inhalation. A
corrosive irritant to the eyes, shin, and
mucous membranes. With the appropriate
conditions it undergoes hazardous reactions
with formic acid, hydrogen fluoride,
inorganic bases, iodides, metals, methyl
hydroperoxide, oxidants (e.g., bromine,
pentafluoride, chlorine trifluoride, perchloric
acid, oxygen Difluoride, hydrogen peroxide),
3-propynol, water. When heated to
decomposition it emits toxic fumes of POx. | [Hazardous Substances Data]
1314-56-3(Hazardous Substances Data) |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
Oxygen-->Phosphorus-->White phosphorus-->Bifenthrin-->Cyclone separator | [Preparation Products]
5-Nitro-6-methyluracil-->1-AMINO-N-HYDROXY-2,2-DIMETHYLPROPAN-1-AMINE-->3-Aminoisoxazole-->3-Methyl-butyramidine HCl-->Ammonium polyphosphate-->Trimethylacetonitrile-->2-Ethylbutylamine-->5-METHYLISOXAZOLE-3-CARBONITRILE-->2,5-BIS(4-BIPHENYLYL)-1,3,4-OXADIAZOLE-->2,5-BIS(3-NITROPHENYL)-1,3,4-OXADIAZOLE-->BIS(2-THIENYL) KETONE-->2,5-BIS(3-METHOXYPHENYL)-1,3,4-OXADIAZOLE-->2,5-DIPHENYL-1,3,4-OXADIAZOLE-->Amitriptyline hydrochloride-->2-Chloro-5-(chloromethyl)pyridine-->2,4-Dichloro-6-methyl-5-nitropyrimidine-->2,5-BIS(1-NAPHTHYL)-1,3,4-OXADIAZOLE-->TERT-BUTYLCARBAMIDINE HYDROCHLORIDE-->Ethyl 4-bromocrotonate-->PIVALAMIDE-->SEC-BUTYLBENZENE-->Xanthene-->antistatic Agent P-->4-AMINO-2-CHLORO-6-METHYL-5-NITROPYRIMIDINE-->4-METHYLUMBELLIFERYL PHOSPHATE-->Bis(4-nitrophenyl) phosphate-->5-Ethoxy-4-methyloxazole-->Pyridoxal phosphate-->6-MORPHOLINONICOTINONITRILE-->4-Chromanone-->Antistatic agent PK-->α-Bromo-2,3,4,5,6-pentafluorotoluene-->TRIS(4-NITROPHENYL) PHOSPHATE-->Petroleum additive-->7-Bromoisoquinoline-->HEXAFLUOROGLUTARIC ANHYDRIDE-->Trichloroacetonitrile-->Diphosphoryl chloride-->Heptafluorobutyric anhydride-->(-)-MENTHYL CHLORIDE |
| Hazard Information | Back Directory | [General Description]
A white amorphous powder. Corrosive to metals and tissue and moderately toxic. | [Reactivity Profile]
PHOSPHORIC ANHYDRIDE(1314-56-3) 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]. | [Air & Water Reactions]
Readily 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]. | [Health Hazard]
Powder 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. | [Potential Exposure]
This material is used as an intermediate in organic synthesis, catalyst, condensing agent; dehydrating agent; in the preparation of acrylate esters, surfactants, sugar refining; medicine, fire extinguishing; and special glasses. | [Fire Hazard]
Reacts 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. | [First aid]
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure，begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. If victim is conscious, administer water, or milk. Do not induce vomiting. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures. Rush to a health care facility | [Shipping]
UN1807 Phosphorus pentoxide, Hazard class: 8; Labels: 8-Corrosive material. | [Incompatibilities]
Reacts violently and exothermically with water, forming ignition level heat and highly corrosive phosphoric acid. Keep away from the combination of moisture and combustible materials. Phosphorus pentoxide reacts violently with the following: perchloric acid; ammonia, hydrofluoric acid; oxidizers, hydrogen fluoride; formic acid, oxygen difluoride, potassium, sodium, propargyl alcohol; calcium oxide; inorganic bases; sodium hydroxide and chlorine trifluoride. Attacks many metals in presence of water. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, alcohols, ammonia. Undergoes hazardous or violent reactions with metal hydroxides and oxides, formic acid, hydrogen fluoride and hydrofluoric acid, iodides, metals (in particular potassium and sodium), ammonia, and proparygl alcohol. | [Waste Disposal]
Decompose with water, forming phosphoric and hydrochloric acids. The acids may then be neutralized and diluted slowly to solution of soda ash and slaked lime with stirring then flush to sewer with large volumes of water. | [Physical properties]
White, deliquescent, powdery solid; exhibits polymorphism; converts to several different crystalline forms on heating; the commercial material consists of hexagonal crystals; the hexagonal crystals on very rapid heating first melt at 420°C and then resolidify immediately to glassy orthorhombic crystals; slow heating of hexagonal crystals causes melting at 340°C which, on solidification, gives the same metastable orthorhombic form; the glassy material melts at about 580°C to a colorless and heavily viscous liquid; sublimes at 360°C; density of the commercial product 2.39g/cm3; reacts with water. | [Definition]
ChEBI: Diphosphonate(2-) is a divalent inorganic anion obtained by removal of both protons from diphosphonic acid. It is a phosphorus oxoanion and a divalent inorganic anion. It is a conjugate base of a diphosphonate(1-). | [Preparation]
Phosphorus pentoxide is prepared by burning phosphorus in a plentiful supply of dry air or oxygen: P4 + 5O2 → P4O10 The crude product may contain a small amount of sesquioxide, P2O3, which may be removed by sublimation in ozonized oxygen. | [Production Methods]
Phosphorus pentoxide or phosphoric anhydride (P2O5) is
formed by burning yellow phosphorus in dry air or oxygen. | [Hazard]
Phosphorus pentoxide is a strong irritant. It is corrosive to skin and contact with eyes can be injurious. | [Agricultural Uses]
Phosphoric anhydride is another name for phosphorus
pentoxide (P2O5). Anhydrides react with water to give
acids. For example, sulphur trioxide reacts with water to
give sulphuric acid, or acetic anhydride reacts with water
to give acetic acid. Similarly, phosphorus pentoxide has
great affinity for water and dissolves in it to give
phosphoric acid, and therefore, is known as phosphoric
anhydride. | [Purification Methods]
It has been sublimed at 250o under vacuum into glass ampoules. It fumes in moist air and reacts violently with water. It is an excellent drying agent for use in desiccators. HARMFUL VAPOURS and attacks skin. [Manley J Chem Soc 121 331 1922, Klements in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 541 1963.] |
| Questions And Answer | Back Directory | [description]
phosphorus pentoxide, also known as phosphoric anhydride, 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.
phosphorus pentoxide is easy to absorb moisture from the air, 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.
phosphorus pentoxide is used to make high purity phosphoric acid, as well as gas and liquid desiccant, organic synthetic dehydrating agent.
| [Chemical Properties]
Phosphorus pentoxide (P2O5) or phosphoric anhydride is a white, highly deliquescent solid which sublimes at 300°C and reacts violently with water to give orthophosphoric acid. It is prepared by burning elemental phosphorus in excess oxygen, and then purified by sublimation. The compound is used as a drying and dehydrating agent; for example, the amides are converted into nitriles, and sulphuric acid is converted to sulphur trioxide (SO3). The fertilizer phosphorus is specified as the weight percentage of phosphorus pentoxide. | [Hazardous characteristics]
Non-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 standards]
Item 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 water]
It 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.
| [Toxicity]
Phosphorus 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 absorption]
There 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.
| [Uses]
Used 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 method]
Reagent 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
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