Isobutyl acetate

  • 2- Methylpropylethanoat
  • Isobutyl
  • I -butyl acetate

Colorless liquid with a fruity odor

Liquid

0.87 g · cm -3 ( 20 ° C)

-98.9 ° C

118 ° C

20 hPa ( 20 ° C)

  • Poorly in water ( 53 g · l-1 at 20 ° C)
  • Soluble in many organic solvents

1.3902 (20 ° C)

Risk

100 ml · m-3, 480 mg · m-3

Template: Infobox chemical / molecular formula search available

Isobutyl acetate, isobutyl acetate or 2- also Methylpropylethanoat (IUPAC), is a clear, colorless liquid with bananenartigem, fruity odor. Is it is the ester of acetic acid and isobutanol. In addition to this nor the esters of the isomeric Butanoles acetic acid sec- butyl ester, acetic acid n-butyl ester and acetic acid tert-butyl ester importance.

Occurrence

Isobutyl acetate is a fruit pomace, which is also contained in the banana. However, he is just one of the many nuances that make up the typical banana flavor.

Representation and extraction

Isobutyl acetate are obtained by esterification of acetic acid with sulfuric acid as the catalyst with isobutanol:

Properties

The melting point of -98.6 ° C. isobutyl acetate is The boiling point at atmospheric pressure is 117.2 ° C.. With water, the compound forms an azeotrope boiling at 87.4 ° C and the mixture. The miscibility with water is low. In water at 20 ° C dissolve only 0.67 % by mass of esters or ester in only 1.65 dissolve at 20 ° C Ma % water.

Thermodynamic properties

The vapor pressure function is given by Antoine corresponding log10 (P) = A- ( B / ( T C )) ( P in bar, T in K) with A = 4.53676, B = 1625.875 and C = -32.494 in temperature range 2529-391 K

Safety characteristics

Iso -butyl acetate is highly flammable vapor - air mixtures. The compound has a flash point of 18 ° C. The explosion range is between 1.3 vol % (60 g/m3) as the lower explosive limit ( LEL) and 10.5 % by volume (510 g/m3 ) and upper explosive limit (UEL ). The ignition temperature is 420 ° C. The fabric falls within the temperature class T2.

Use

Isobutyl acetate is used as a fragrance and a moderately volatile solvent in the paint industry. In addition, the compound is a good solvent for cellulose nitrate, colophony, polystyrene, polyvinyl acetates, polyvinyl ethers, polyacrylates, various copolymers of vinyl chloride and condensation resins such as phenol resins, urea resins, melamine resins and epoxy resins.

CAS registry number PubChem Dangerous Substances Directive (67/548/EEC) Antoine equation Critical point (thermodynamics) Flammability limit Nitrocellulose CRC Handbook of Chemistry and Physics Digital Object Identifier
316720
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