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Propyne
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Propyne
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C3H4
Propyne

Physical Properties

Under solid (grey), liquid (blue) and vapor states (white) along the equilibrium curves

  • General properties
  • Solid phase
  • Liquid Phase
  • Gas Phase
(P)
log(P)
Download
  • Molecular weight
    40.06
    g/mol
  • Content in air
    /

Critical Point

  • Temperature
    129.23
    °C
    264.614 °F 402.38 K
  • Pressure
    56.26
    bar
    5.626E6 pa 815.982 lbf/in2 55.5243 Atm 5626 Kpa 4.2199E4 mmHg
  • Density
    244.899
    kg/m³
    15.2885 lb/ft³

Triple Point

  • Temperature
    - 102.65
    °C
    - 152.77 °F 170.5 K
  • Pressure
    4.171E-3
    bar
    417.1 pa 6.0495E-2 lbf/in2 4.1165E-3 Atm 4.171E-1 Kpa 3.1285 mmHg
Pressure 1.013 bar
  • Melting point
    - 102.7
    °C
    - 152.86 °F 170.45 K
  • Latent heat of fusion (at melting point)
    133.55
    kJ/kg
    57.4547 Btu/lb 31.9192 kcal/kg
  • Solid density
    /
Pressure 1.013 bar
  • Liquid density
    674.383
    kg/m³
    42.1003 lb/ft³
  • Boiling point
    - 25.15
    °C
    - 13.27 °F 248 K
  • Latent heat of vaporization (at boiling point)
    553.731
    kJ/kg
    238.2212 Btu/lb 132.3449 kcal/kg
Pressure1.013barTemperature
  • Compressibility factor Z
    9.7675E-1
    9.8092E-1
    9.8311E-1
  • Cp/Cv ratio γ
    1.1865
    1.1761
    1.1702
  • Dynamic viscosity
    7.9079E-5
    Po
    7.9079 µPa.s 7.9079E-6 PA.S 5.3139E-6 lb/ft/s
    8.3459E-5
    Po
    8.3459 µPa.s 8.3459E-6 PA.S 5.6082E-6 lb/ft/s
    8.6348E-5
    Po
    8.6348 µPa.s 8.6348E-6 PA.S 5.8023E-6 lb/ft/s
  • Gas density at boiling point
    /
    /
    /
  • Gas density
    1.8299
    kg/m³
    1.1424E-1 lb/ft³
    1.7272
    kg/m³
    1.0783E-1 lb/ft³
    1.6656
    kg/m³
    1.0398E-1 lb/ft³
  • Heat capacity at constant pressure Cp
    1.4958
    kJ/(kg.K)
    3.5751E-1 BTU/lb∙°F 1495.8 J/kg∙K 3.5751E-1 kcal/kg∙K
    1.5275
    kJ/(kg.K)
    3.6508E-1 BTU/lb∙°F 1527.5 J/kg∙K 3.6508E-1 kcal/kg∙K
    1.5512
    kJ/(kg.K)
    3.7075E-1 BTU/lb∙°F 1551.2 J/kg∙K 3.7075E-1 kcal/kg∙K
  • Heat capacity at constant volume Cv
    1.2607
    kJ/(kg.K)
    3.0131E-1 BTU/lb∙°F 1260.7 J/kg∙K 3.0131E-1 kcal/kg∙K
    1.2988
    kJ/(kg.K)
    3.1042E-1 BTU/lb∙°F 1298.8 J/kg∙K 3.1042E-1 kcal/kg∙K
    1.3256
    kJ/(kg.K)
    3.1683E-1 BTU/lb∙°F 1325.6 J/kg∙K 3.1683E-1 kcal/kg∙K
  • Liquid (at boiling point)/gas equivalent
    369.535
    mol/mol
    390.449
    mol/mol
    404.889
    mol/mol
  • Solubility in water
    /
    /
    /
  • Specific gravity
    /
    /
    /
  • Specific volume
    5.465E-1
    m³/kg
    8.7541 ft³/lb
    5.79E-1
    m³/kg
    9.2747 ft³/lb
    6.004E-1
    m³/kg
    9.6175 ft³/lb
  • Thermal conductivity
    13.725
    mW/m∙K
    7.9355E-3 Btu/ft/h/°F 1.1809E-1 cal/hour∙cm∙°C 3.2804E-5 cal/s∙cm∙°C 1.3725E-2 W/(m∙K)
    15.19
    mW/m∙K
    8.7825E-3 Btu/ft/h/°F 1.307E-1 cal/hour∙cm∙°C 3.6305E-5 cal/s∙cm∙°C 1.519E-2 W/(m∙K)
    16.188
    mW/m∙K
    9.3595E-3 Btu/ft/h/°F 1.3929E-1 cal/hour∙cm∙°C 3.869E-5 cal/s∙cm∙°C 1.6188E-2 W/(m∙K)
  • Vapor pressure
    /
    /
    /
C3H4
Propyne

Liquid / Gas Volumes

Calculate a liquid or gas volume or a mass

Liquid Phase

At boiling point at 1.013 bar

m3(Volume)
kg(Mass)

Gas Phase

at 1.013 bar and boiling point

m3(Volume)
kg(Mass)
C3H4
Propyne

Applications

Examples of uses of this molecule in Industry and Healthcare

C3H4
Propyne

Safety

Information to safely use this molecule

  • Major hazards
  • Material compatibility
  • GHS02
    Flammable
  • GHS04
    Gas under pressure

Autoignition Temperature in Air at Patm and Flammability Limits in Air at Patm and 293.15 K (except if the temperature is indicated)

  • Europe (according to EN1839 for Limits and EN 14522 for autoignition temperature)

    • Auto-ignition temperature
      340
      °C
      644 °F 613.15 K
    • Flash point
      /
    • Lower flammability limit
      1.8
      vol/%
      1.8E4 ppm 1.8E4 ppm 1.8E-2 vol/vol
    • Upper flammability limit
      16.8
      vol/%
      1.68E5 ppm 1.68E5 ppm 1.68E-1 vol/vol
  • US (according to NFPA for Limits and ASTM E659 for autoignition temperature)

    • Auto-ignition temperature
      /
    • Flash point
      /
    • Lower flammability limit
      1.7
      vol/%
      1.7E4 ppm 1.7E4 ppm 1.7E-2 vol/vol
    • Upper flammability limit
      /

Threshold of toxicity

  • VME
    1000
    ppm
    or 1640
    mg/m3
  • VLE
    /
  • ILV-8h
    /
  • ILV 15mn
    /
  • TLV-TWA (USA)
    1000
    ppm
    1000 ppm 0.1 vol/% 1.E-3 vol/vol
  • TLV-STEL (USA)
    /

Odor

Sweet

Metals

  • Aluminium
    Satisfactory
  • Brass
    Satisfactory
  • Monel
    no data
  • Copper
    no data
  • Ferritic Steel
    Satisfactory
  • Stainless steel
    Satisfactory
  • Zinc
    no data
  • Titanium
    no data

Plastics

  • Polytetrafluoroethylene
    no data
  • Polychlorotrifluoroethylene
    no data
  • Polyvinylidene fluoride
    no data
  • Polyvinyl chloride
    no data
  • Ethylene tetrafluoroethylene
    no data
  • Polycarbonate
    no data
  • Polyamide
    no data
  • Polypropylene
    no data

Elastomers

  • Buthyl (isobutene- isoprene) rubber
    no data
  • Nitrile rubber
    no data
  • Chloroprene
    no data
  • Chlorofluorocarbons
    no data
  • Silicon
    no data
  • Perfluoroelastomers
    no data
  • Fluoroelastomers
    no data
  • Nitrile rubber
    no data
  • Neoprene
    no data
  • Polyurethane
    no data
  • Ethylene-Propylene
    no data

Lubricants

  • Hydrocarbon based lubricant
    no data
  • Fluorocarbon based lubricant
    no data

Materials compatibility

Recommendations : Air Liquide has gathered data on the compatibility of gases with materials to assist you in evaluating which materials to use for a gas system. Although the information has been compiled from what Air Liquide believes are reliable sources (International Standards: Compatibility of cylinder and valve materials with gas content; Part 1- Metallic materials: ISO11114-1 (March 2012), Part 2 - Non-metallic materials: ISO11114-2 (April 2013), it must be used with extreme caution and engineering judgement. No raw data such as these can cover all conditions of concentration, temperature, humidity, impurities and aeration. It is therefore recommended that this table is only used to identify possible materials for applications at high pressure and ambient temperature. Extensive investigation and testing under the specific conditions of use need to be carried out to validate a material selection for a given application. Contact the regional Air Liquide team for expertise service.

C3H4
Propyne

Learn More

General information

More information

Propyne, or methylacetylene, is an alkyne with the chemical formula CH3C≡CH. It is produced as a side product, often an undesirable one, by cracking propane to produce propene, an important feedstock in the chemical. European space companies have researched using light hydrocarbons with liquid oxygen as a relatively high performing liquid rocket propellant combination that would also be less toxic than the commonly used MMH/NTO (monomethylhydrazine/nitrogen tetroxide). Their research showed that propyne would be highly advantageous as a rocket fuel for craft intended for low Earth orbital operations. It is colorless and highly flammable.