Methanol

Methanol (also called methyl alcohol and wood spirit, amongst other names) is an organic chemical and the simplest aliphatic alcohol, with the formula CH3OH (a methyl group linked to a hydroxyl group, often abbreviated as MeOH). It is a light, volatile, colorless and flammable liquid with a distinctive alcoholic odour similar to that of ethanol (potable alcohol). Methanol acquired the name wood alcohol because it was once produced chiefly by the destructive distillation of wood. Today, methanol is mainly produced industrially by hydrogenation of carbon monoxide.

Methanol consists of a methyl group linked to a polar hydroxyl group. With more than 20 million tons produced annually, it is used as a precursor to other commodity chemicals, including formaldehyde, acetic acid, methyl tert-butyl ether, methyl benzoate, anisole, peroxyacids, as well as a host of more specialised chemicals.

Category:

Application

It is used as an antifreeze, solvent, fuel, and as a denaturant for ethanol. It is used in the production of fuel.

Solubility in water

miscible

Chemical formula

CH3OH or CH4O

Molar mass

32.04 g mol−1

Appearance

Colourless liquid

Odor

Faint and similar to ethanol

Density

0.792 g/cm3

Melting point

−97.6 °C (−143.7 °F; 175.6 K)

Boiling point

64.7 °C (148.5 °F; 337.8 K)

log P

−0.69

Vapor pressure

13.02 kPa (at 20 °C)

Acidity (pKa)

15.5

Conjugate acid

Methyloxonium

Conjugate base

Methanolate

Magnetic susceptibility (χ)

−21.40·10−6 cm3/mol

Refractive index (nD)

1.33141

Viscosity

0.545 mPa·s (at 25 °C)

Dipole moment

1.69 D

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