Iso Butanol

Cas Number


Other Names

Isobutyl alcohol,



2-Methylpropyl alcohol,


The formula



Isobutanol (IUPAC nomenclature: 2-methylpropan-1-ol) is an organic compound with the formula (CH3)2CHCH2OH (sometimes represented as i-BuOH). This colorless, flammable liquid with a characteristic smell is mainly used as a solvent. Its isomers, the other butanols, include n-butanol, 2-butanol, and tert-butanol, all of which are important industrially.

Physical and Chemical Properties
Physical state and Appearance : White to yellowish Solid.
Odor : Odorless
Molecular Weight : 74.122 g/mole
PH (1% soln/water) : 3.2 [Acidic.]
Flash point : 152 °C
Melting Point: Decomposition temperature: 151°C (303.8°F) -157 °C
Specific Gravity: Density: 1.67 (Water = 1)
Dispersion Properties: See solubility in water.
Solubility: Easily soluble in hot water. Soluble in cold water. Solubility in water: 560 g/l @ 20 deg. °C; 83 g/100 mg @ 17 deg. °C.
Density at 20°C, g/cm3: 0.801--0.803
Mass fraction of isobutyl alcohol, %, min: 99.3
Mass fraction of acids in acetic acid recalculation,%, max: 0.003
Bromine number, g of brome/100 g of alcohol, max 0.02
Mass fraction of carbonyl compounds in butyric aldehyde recalculation,%, min 0.03
Mass fraction of non-volatile residue, %, max 0.025
Mass fraction of water, %, max 0.1

Isobutanol has a variety of technical and industrial applications: Feedstock in the manufacture of isobutyl acetate, which is used in the production of lacquer and similar coatings, and in the food industry as a flavouring agent Precursor of derivative esters; isobutyl esters such as diisobutyl phthalate (DIBP) are used as plasticizer agents in plastics, rubbers, and other dispersions Paint solvent Varnish remover Ink ingredient Paint additive, to reduce viscosity, improve brush flow, and retard formation of oil residues (blush) on painted surfaces Gasoline additive, to reduce carburetor icing Automotive polish additive Automotive paint cleaner additive Chemical extractant in production of organic compounds Mobile phase in thin layer chromatography. Isobutanol could possibly serve as an alternative to gasoline to fuel combustion engines and it is being produced by companies such as Gevo for this use in a joint venture with Cargill.A 1993 SAE technical paper addresses blending methanol, ethanol and isobutanol with unleaded gasoline for use as a motor fuel.[5] A similar mixture is being used by Dyson Racing in the 2010 American LeMans Series.[6] Gevo intends to acquire Agri-Energy's Luverne, Minnesota, ethanol production facility to retrofit it to produce commercial quantities of isobutanol for motor fuel. Isobutanol could possibly serve as an alternative to gasoline to fuel combustion enginesl.