Butyl acetate
- Butyl acetate
- Butylethanoat
- N-butyl
Colorless, fruity -smelling liquid
Liquid
0.88 g · cm -3 ( 20 ° C)
-77 ° C
127 ° C.
10.7 hPa ( 20 ° C)
- Poorly in water (10 g · l-1 at 20 ° C)
- Miscible with many organic solvents
1.3941 (20 ° C)
Attention
480 mg · m- 3, 100 ml · m-3
Template: Infobox chemical / molecular formula search available
Acetate, n -butyl, butyl acetate or even Butylethanoat, is a clear, colorless solvent with a rather pleasant, fruchtartigem odor. Is the ester of acetic acid with 1-butanol. In addition to this still have the esters of Butanol Isomers acetic acid sec -butyl ester, isobutyl acetate and acetic acid tert-butyl ester importance.
Representation and extraction
Acid n-butyl ester can be obtained by esterification of acetic acid as a catalyst and 1-butanol with sulfuric acid.
Properties
Acetic acid -n- butyl ester is a colorless liquid with fruchtartigem odor. The melting temperature is -76 ° C. The boiling point under atmospheric pressure is 126 ° C. With water, the compound forms an azeotropic mixture. At normal pressure and with a water content of 26.7 % by mass of the azeotropic boiling point is 90.2 ° C.
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 = 4.26803, B = 1440.231 and C = -61.362 in temperature range from 332.9 to 399.2 K
The temperature dependence of the enthalpy of vaporization can be determined according to equation ΔVH0 = A · e ( - βTr ) (1- Tr) β ( ΔVH0 in kJ / mol, Tr = (T / Tc) reduced temperature ) with A = 64.07 kJ / mol, β = 0.306 and Tc = 579 K describe the temperature range between 298 K and 358 K.
Safety characteristics
N -butyl acetate is highly flammable vapor - air mixtures. The compound has a flash point of 27 ° C. The explosive range is between 1.2 vol% (58 g/m3) as the lower explosive limit ( LEL) and 7.5 % by volume (360 g/m3 ) and upper explosive limit (UEL ). The maximum explosion pressure is 8.6 bar. The marginal gap width was determined to be 1.02 mm. The result is thus a mapping in the explosion group IIA. The ignition temperature is 390 ° C. The fabric falls within the temperature class T2.
Use
Acid n-butyl ester is a common paint solvent. Furthermore, it is also used in the chemical laboratory as a solvent.
In addition to use it in Histological analysis method, where it is used as an " interlude ". A clearing agent is interposed before embedding of histological organs in paraffin, because paraffin can not mix with alcohol ( alcohol in the body has been previously inserted). The intermedium should incidentally escape last traces of water from the body, as it could cause discomfort when cutting the specimen otherwise. It would tear more easily. Acid n-butyl ester is, inter alia, also in apple juice and there is used as one of the reference compounds for the flavor index apple.