2019-01-25 14:26:37

What is the Methyl Ethyl Ketone

  Colorless transparent liquid.It smells like acetone.Volatile.It can be miscible with ethanol, ether, benzene, chloroform and oil.It is soluble in 4 parts water, but the solubility decreases as the temperature increases.11.3% can form azeotrope with water (water), azeotropic temperature 73.4 ℃ (including butanone 88.7%).Relative density (d204)0.805.Freezing point - 86 ℃.Boiling point 79.6 ℃.Refractive index (n15D)1.3814.Flash point 1.1 ℃.Low toxicity, median lethal dose (orally) : 330 mg /kG.Flammable, vapor and air can form explosive mixture, explosion limit of 1.81%~11.5%(volume).High concentrations of steam are narcotic.


The name:Methyl ethyl ketone


The alias:2 - butanone

Molecular formula:C4H8O


Relative molecular mass:72.10

Chemical category:Organic compounds -- ketones

Control type:Methyl ethyl ketone (protoxy-3)

storage:Sealed, cool and dry


Physical properties

Appearance and properties: colorless liquid with acetone-like odor.

Melting point () : 85.9

Relative density (water =1):0.81

Boiling point () : 79.6

Relative vapor density (air =1):2.42

Saturated vapor pressure (kPa) : 9.49 (20 )

Heat of combustion (kJ/mol) : 2441.8

Critical temperature () : 260

Critical pressure (MPa):4.40

Log of octanol/water partition coefficient :0.29

Flash point () : 9

Explosion upper limit %(V/V):11.4

Ignition temperature () : 404

Lower explosion limit %(V/V):1.7

Solubility: soluble in water, ethanol, ether, but soluble in oil.

Molecular structure data:

1. Molar refractive index :20.60

2. Molar volume (m3/mol):91.6

3. Zhang birong (90.2k):196.3

4. Surface tension (dyne/cm):21.0

5. Polarizability (10-24cm3):8.17


Chemical properties

1. Butanone is prone to various reactions due to its carbonyl group and its adjacent active hydrogen.Condensation with hydrochloric acid or sodium hydroxide produces 3, 4-dimethyl-3-hexene-2-ketone or 3-methyl-3-heptene-5-ketone.When exposed to sunlight for a long time, ethane, acetic acid and condensation products are produced.Diacetyl is formed when nitric acid is oxidized.Acetic acid is produced when oxidized with strong oxidants such as chromic acid.Butanone to heat stable, above 500 hot tear formation ketene or methyl ketene.When condensation occurs with aliphatic or aromatic aldehydes, high molecular weight ketones, cyclic compounds, ketones and resins are produced.For example, when it condenses with formaldehyde in the presence of sodium hydroxide, it first produces 2-methyl-1-butanol-3-ketone, and then dehydrates to form methyl isopropyl ketone.The compound resins when exposed to sunlight or ultraviolet light.Condensation with phenol to form 2, 2-bis (4-hydroxyphenyl) butane.React with aliphatic esters in the presence of an alkaline catalyst to produce -diketone.Acylation with anhydride in the presence of an acid catalyst yields -diketone.React with hydrogen cyanide to form cyanol.React with ammonia to form ketopidine derivatives.The -hydrogen atoms of butanone are easily replaced by halogens to form a variety of halogenated ketones, such as 3-chloro-2-butanone by interaction with chlorine.With 2, 4 - dinitrobenzene hydrazine effect generated yellow 2, 4 - dinitrobenzene hydrazone (m.p. 115 ).

2. Stability: stability.

3. Prohibited compounds: strong oxidant, alkali, strong reducing agent.

4. Polymerization hazard: no polymerization.

Ecological data

1. Ecological toxicity

LC50:1690~5640mg/L(96h)(bluegill sunfish);3200mg/L(96h)(minnows, pH 7.5);1950 mg/L (24 h) (halogen insect);<520mg/L(48h)(daphnia, pH 8);918~3349mg/L(48h)(daphnia, pH 7.21)

IC50:110~4300mg/L(72h)(algae).

2. Biodegradability

Aerobic biodegradation (h):24~168;

Anaerobic biodegradation (h):96~672;

3. Non-biodegradability

Photooxidation half-life in water (h):1.80 104~7.10 105;

Photooxidation half-life in air (h):64.2~642;

First order hydrolysis half-life (h):>50a.