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PHOSPHORUS PENTAFLUORIDE

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PHOSPHORUS PENTAFLUORIDE Basic information
PHOSPHORUS PENTAFLUORIDE Chemical Properties
  • Melting point:-83°C
  • Boiling point:-75°C
  • Density 5.805g/l
  • RTECS TH4070000
  • Flash point:-84.6°C
  • form Gas
  • color Colorless
  • Water Solubility hydrolyzed in H2O, eventually to H3PO4 [MER06]
  • Sensitive Moisture Sensitive
  • Merck 14,7352
  • Exposure limitsTLV-TWA 2.5 mg(F)/m3 (ACGIH and OSHA).
  • CAS DataBase Reference7647-19-0(CAS DataBase Reference)
  • EPA Substance Registry SystemPentafluorophosphorane (7647-19-0)
Safety Information
  • Hazard Codes C,T
  • Risk Statements 23-32-34
  • Safety Statements 3/7-9-38-45
  • RIDADR 2198
  • Hazard Note Toxic/Corrosive
  • TSCA Yes
  • HazardClass 2.3
MSDS
  • Language:EnglishProvider:ALFA
PHOSPHORUS PENTAFLUORIDE Usage And Synthesis
  • UsesPhosphorus pentafluoride is a catalyst in ionic polymerization reactions.
  • PreparationPhosphorus pentafluoride may be prepared by several methods, among which are:
    • Treating phosphorus trifluoride with bromine and then heating the product phosphorus trifluoride dibromide, PF3Br2:
    PF3 + Br2 → PF3Br2
    5PF3Br2 → 3PF5 + 2PBr5
    • Heating phosphorus pentachloride with arsenic trifluoride:
    PCl5 + 5AsF3 → 3PF5 + 5AsCl3
    • Subjecting phosphorus trifluoride to an electric spark in the absence of air (a disproportion reaction occurs):
    5PF3 → 3PF5 + 2P (in the presence of air, the product is phosphorus oxyfluoride, POF3)
    • Heating a mixture of phosphorus pentoxide and calcium fluoride:
    P2O5 + 5CaF2 → 2PF5 + 5CaO
    • Heating a mixture of phosphorus oxyfluoride, hydrogen fluoride and sulfur trioxide:
    POF3 + 2HF + SO3 → PF5 + H2SO4
    The gas should be stored in steel cylinders in the absence of moisture.
  • Chemical Propertiescolorless gas; nonflammable; fumes strongly in air; high thermal stability; critical temp 144.5°C; critical pressure 3.39MPa; enthalpy of fusion 12.1 kJ/mol; enthalpy of vaporization 17.2 kJ/mol; can be prepared by reaction of PF3 with F2; used as a polymerization catalyst and in electronics industry [AIR87] [HAW93] [MER06] [CRC10] [KIR78]
  • Physical propertiesColorless gas; fumes in air; density 5.527g/L; heavier than air, density in air 4.35 (air=1); liquefies at -84.6°C; freezes at -93.8°C; reacts with water.
  • UsesPhosphorus pentafluoride is usedas a catalyst in polymerization reactions.
  • UsesCatalyst in ionic polymerization reactions.
  • General DescriptionPHOSPHORUS PENTAFLUORIDE is a colorless, poisonous, nonflammable, compressed gas with a pungent odor. PHOSPHORUS PENTAFLUORIDE is extremely irritating to skin, eyes and mucus membranes. PHOSPHORUS PENTAFLUORIDE is very toxic by inhalation and can cause pulmonary edema. Toxic and corrosive fumes are generated when PHOSPHORUS PENTAFLUORIDE is exposed to water or steam. Prolonged exposure of the containers to fire or heat may result in their violent rupturing and rocketing. PHOSPHORUS PENTAFLUORIDE is used as a polymerization catalyst.
  • Air & Water ReactionsFumes strongly in air, with traces of moisture forming POF3 and HF (corrosive). Decomposed in water or moist air to form phosphoric acid and hydrofluoric Acid, corrosive [Merck 11th ed. 1989].
  • Reactivity ProfilePHOSPHORUS PENTAFLUORIDE is a colorless, toxic gas, when exposed to air PHOSPHORUS PENTAFLUORIDE strongly fumes. Vigorous reaction with water or steam leads to decomposition (hydrolysis) producing toxic and corrosive fumes. When heated to decomposition PHOSPHORUS PENTAFLUORIDE emits toxic fumes of fluoride and oxides of phosphorus [Lewis, 3rd ed., 1993, p. 1034].
  • HazardPhosphorus pentafluoride is a highly toxic gas. Inhalation can cause severe irritation of mucous membrane and pulmonary edema. It is corrosive to skin and can damage eyes.
  • Health HazardTOXIC; may be fatal if inhaled, ingested or absorbed through skin. Vapors are extremely irritating and corrosive. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.
  • Health HazardPhosphorus pentafluoride is highly irritating to the skin, eyes, and respiratory tract. Exposure to this gas can cause pulmonary edema and lung injury. The LC50 value for this compound is not reported. The concentration in air at which it may be lethal to mice over a 10-minute exposure period is estimated to be about 400 ppm (~2050 mg/m3).
  • Fire HazardSome may burn but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Some of these materials may react violently with water. Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket.
  • Safety ProfileA poisonous gas. Violently irritating to skin, eyes, and - mucous membranes. Inhalation may cause pulmonary edema. Reacts with water or steam to produce toxic and corrosive fumes. When heated to decomposition it emits highly toxic fumes of Fand POx. See also FLUORIDES.
  • Waste DisposalPhosphorus pentafluoride is destroyed by bubbling the gas through a solution of caustic soda (in excess) at a cold temperature. The alkaline mixture is neutralized slowly by dilute HCl and washed down the drain.
PHOSPHORUS PENTAFLUORIDE Preparation Products And Raw materials
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