Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Methanol - Thermophysical Properties

Chemical, physical and thermal properties of methanol, CH3OH (also called carbinol, wood alcohol, hydroxy methyl and methyl alcohol). Phase diagram included.

Sponsored Links

Methanol, CH 3 -OH, is a colorless, fairly volatile liquid with a faintly sweet pungent odor, similar, but somewhat milder and sweeter than ethanol .

Methanol is toxic, and may cause blindness. The vapors are slightly heavier than air and may explode if ignited.

Methanol is used to make chemicals, to remove water from automotive and aviation fuels, as a solvent for paints and plastics, and as an ingredient in a wide variety of products.

The phase diagram of methanol is shown below the table.

Chemical, physical and thermal properties of ethanol:
Values are given for liquid at 25 oC /77 o F / 298 K and 1 bara, if not other phase, temperature or pressure given.

For full table with Imperial Units - rotate the screen!

Methanol - Thermophysical Properties
Property Value Unit Value Unit Value Unit Value Unit
Acidity (pK a1 ) 15.3
Autoignition temperature 737 K 464 °C 867 °F
Boiling Point 337.85 K 64.7 °C 148.5 °F
Critical density 8.7852 mol/dm 3 281 kg/m 3 0.546 slug/ft 3 17.6 lb/ft 3
Critical Pressure 8.22 MPa=MN/m 2 82.2 bar 81.1 atm 1192 psi=lb f /in 2
Critical temperature 513.4 K 240.2 °C 464.4 °F
Critical Volume 114 cm 3 /mol 0.003552456 m 3 /kg 1.831 ft 3 /slug 0.05690 ft 3 /lb
Density (gas) at 0.17 bar 6.87 mol/m 3 0.220 kg/m 3 0.00043 slug/ft 3 0.0137 lb/ft 3
Density (liquid) 24540 mol/m 3 786.3 kg/m 3 1.526 slug/ft 3 49.09 lb/ft 3
Flammable, gas and liquid yes
Flash point 284 K 11 °C 52 °F
Gas constant , individual - R 259.5 J/kg K 0.07208 Wh/(kg K) 1552 [ft lb f /slug °R] 48.23 [ft lb f /lb °R]
Gibbs free energy of formation (gas) -163 kJ/mol -5087 kJ/kg -2187 Btu/lb
Heat (enthalpy) of combustion (gas) 726.1 kJ/mol 22661 kJ/kg 9.7 Btu/lb
Heat (enthalpy) of combustion (liquid) -727 kJ/mol -22689 kJ/kg -9.8 Btu/lb
Heat (enthalpy) of formation (gas) -205 kJ/mol -6398 kJ/kg -2751 Btu/lb
Heat (enthalpy) of formation (liquid) -239 kJ/mol -7459 kJ/kg -3207 Btu/lb
Heat (enthalpy) of fusion at -143°F/-97°C 3.18 kJ/mol 99 kJ/kg 42.67 Btu/lb
Heat (enthalpy) of evaporation 37.34 kJ/mol 1165 kJ/kg 501.01 Btu/lb
Specific heat capacity , Cp (gas) at 0.17 bar 116 J/mol K 3.62 kJ/kg K 0.865 Btu/lb°F or cal/g K
Specific heat capacity, Cp (liquid) 81.2 J/mol K 2.53 kJ/kg K 0.605 Btu/lb°F or cal/g K
Specific heat capacity, Cp (solid) at -148°F/-100°C 105 J/mol K 3.28 kJ/kg K 0.783 Btu/lb°F or cal/g K
Specific heat capacity, Cv (gas) at 0.17 bar 94.5 J/mol K 2.95 kJ/kg K 0.704 Btu/lb°F or cal/g K
Specific heat capacity, Cv (liquid) 67.9 J/mol K 2.12 kJ/kg K 0.506 Btu/lb°F or cal/g K
Ionization potential 10.84 eV
log K OW (Octanol/Water Partition Coefficient) -0.77
Melting point 175.55 K -97.6 °C -143.7 °F
Molecular Weight 32.042 g/mol 0.07064 lb/mol
Solubility in water 1000 mg/ml (Miscible in water)
Sound velocity in gas, at 0.17 bar 297 m/s 974 ft/s 665 mi/h
Sound velocity in liquid 1100 m/s 3608 ft/s 2464 mi/h
Specific Gravity (gas) (relativ to air) 1.11
Specific Gravity (liquid) (relativ to water) 0.79
Specific Heat Ratio (gas) - cp/cv 1.23
Specific Heat Ratio (liquid) - cp/cv 1.20
Specific Volume (gas) 0.17 bar 0.146 m 3 /mol 4.55 m 3 /kg 2342.63 ft 3 /slug 72.81 ft 3 /lb
Specific Volume (liquid) 0.0000408 m 3 /mol 0.00127 m 3 /kg 0.655 ft 3 /slug 0.0204 ft 3 /lb
Standard molar entropy , S° (gas) 240 J/mol K 7.49 kJ/kg K 1.79 Btu/lb °F
Standard molar entropy, S° (liquid) 127 J/mol K 3.96 kJ/kg K 0.95 Btu/lb °F
Surface tension 22.07 dynes/cm 0.02207 N/m
Thermal Conductivity 0.202 W/m°C 0.116713 Btu/hr ft °F
Triple point pressure 1.86*10 -7 MPa=MN/m 2 1.86*10-6 bar 1.84*10-6 atm 2.70*10 -5 psi=lbf/in 2
Triple point temperature 175.50 K -97.7 °C -143.77 °F
Vapor (saturation) pressure 0.0169 MPa=MN/m 2 127.0 mm Hg 0.1671 atm 2.46 psi=lbf/in 2
Viscosity , dynamic (absolute) 0.544 cP 365.55 [lbm /ft s*10-6 ] 11.36 [lbf s/ft2*10-6 ]
Viscosity , kinematic 0.692 cSt 7.4 [ft2/s*10-6 ]

Follow the links below to get values for the listed properties of methanol at varying pressure and temperature :

See also more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Ammonia , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Helium , Hydrogen , Hydrogen sulfide , Methane , Nitrogen , Oxygen , Pentane , Propane , Toluene , Water and Heavy water, D2O .

Methanol is a liquid at standard conditions. However, at low temperature and/or very high pressures it becomes a solid.

The phase diagram for methanol shows the phase behavior with changes in temperature and pressure. The curve between the critical point and the triple point shows the methanol boiling point with changes in pressure. It also shows the saturation pressure with changes in temperature.

Methanol phase diagram

At the critical point there is no change of state when pressure is increased or if heat is added.

The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.

Sponsored Links

Related Topics

  • Fluid Mechanics

    The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
  • Material Properties

    Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
  • Thermodynamics

    Work, heat and energy systems.

Related Documents

Sponsored Links

Search

Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

Citation

This page can be cited as

  • The Engineering ToolBox (2018). Methanol - Thermophysical Properties. [online] Available at: https://www.engineeringtoolbox.com/methanol-methyl-alcohol-properties-CH3OH-d_2031.html [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter

















































2.27.11

Sponsored Links
.