Butanone
Chemical compound / From Wikipedia, the free encyclopedia
Butanone, also known as methyl ethyl ketone (MEK) or ethyl methyl ketone,[lower-alpha 1] is an organic compound with the formula CH3C(O)CH2CH3. This colorless liquid ketone has a sharp, sweet odor reminiscent of acetone. It is produced industrially on a large scale, but occurs in nature only in trace amounts.[7] It is partially soluble in water, and is commonly used as an industrial solvent.[8] It is an isomer of another solvent, tetrahydrofuran.
Quick Facts Names, Identifiers ...
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Names | |||
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Preferred IUPAC name
Butan-2-one[2] | |||
Other names
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Identifiers | |||
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3D model (JSmol) |
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741880 | |||
ChEBI | |||
ChEMBL | |||
ChemSpider |
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ECHA InfoCard | 100.001.054 | ||
25656 | |||
KEGG |
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PubChem CID |
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RTECS number |
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UNII | |||
UN number | 1193 | ||
CompTox Dashboard (EPA) |
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Properties | |||
C4H8O | |||
Molar mass | 72.107 g·mol−1 | ||
Appearance | Colorless liquid | ||
Odor | Mint or acetone-like[3] | ||
Density | 0.8050 g/mL | ||
Melting point | −86 °C (−123 °F; 187 K) | ||
Boiling point | 79.64 °C (175.35 °F; 352.79 K) | ||
27.5 g/100 mL | |||
log P | 0.37[4] | ||
Vapor pressure | 78 mmHg (20 °C)[3] | ||
Acidity (pKa) | 14.7 | ||
−45.58·10−6 cm3/mol | |||
Refractive index (nD) |
1.37880 | ||
Viscosity | 0.43 cP | ||
Structure | |||
2.76 D | |||
Hazards | |||
GHS labelling: | |||
[5] | |||
Danger[5] | |||
H225, H319, H336[5] | |||
P210, P233, P240, P241, P242, P243, P261, P264, P271, P280, P303+P361+P353, P304+P340, P305+P351+P338, P312, P337+P313, P370+P378, P403+P233, P403+P235, P405, P501[5] | |||
NFPA 704 (fire diamond) | |||
Flash point | −9 °C (16 °F; 264 K) | ||
505 °C (941 °F; 778 K) | |||
Explosive limits | 1.4–11.4%[3] | ||
Lethal dose or concentration (LD, LC): | |||
LD50 (median dose) |
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LC50 (median concentration) |
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NIOSH (US health exposure limits): | |||
PEL (Permissible) |
TWA 200 ppm (590 mg/m3)[3] | ||
REL (Recommended) |
TWA 200 ppm (590 mg/m3) ST 300 ppm (885 mg/m3)[3] | ||
IDLH (Immediate danger) |
3000 ppm[3] | ||
Safety data sheet (SDS) | Safety Data Sheet | ||
Related compounds | |||
Related ketones |
Acetone; 3-pentanone; 3-methylbutanone | ||
Supplementary data page | |||
Butanone (data page) | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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