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Acetic anhydride
Acetic anhydride
- CAS:
- 108-24-7
- MF:
- C4 H6 O3
- MW:
- 102.09
Properties
- Melting point:
- -73.1 °C
- Boiling point:
- 140 °C
- Density
- 1.087
- vapor density
- 3.5 (vs air)
- vapor pressure
- 10 mm Hg ( 36 °C)
- refractive index
- n
20/D 1.390(lit.)
- Flash point:
- 130 °F
- storage temp.
- Store at RT.
- solubility
- Miscible with ether, chloroform and benzene.
- form
- Liquid
- Specific Gravity
- 1.082
- color
- Colorless
- Odor
- Very strong; pungent; vinegar-like characteristic odor.
- PH
- 3 (10g/l, H2O, 20°C)
- explosive limit
- 2.0-10.2%(V)
- Odor Type
- acidic
- Water Solubility
- REACTS
- Sensitive
- Moisture Sensitive
- Merck
- 14,56
- BRN
- 385737
- Exposure limits
- NIOSH REL: ceiling 5 ppm (20 mg/m3), IDLH 200 ppm; OSHA PEL: 5 ppm; ACGIH TLV: ceiling 5 ppm.
- Dielectric constant
- 20.0
- Stability:
- Stability Flammable. Incompatible with strong oxidizing agents, water, strong bases, alcohols.
- LogP
- -0.58 at 20℃
Safety Information
- Symbol(GHS)
GHS02,GHS05,GHS06
- Signal word
- Danger
- Hazard statements
- H226-H302-H314-H330
- Precautionary statements
- P210-P280-P301+P312-P303+P361+P353-P304+P340+P310-P305+P351+P338
- Hazard Codes
- C,Xn,F,Xi
- Risk Statements
- 11-20/21/22-37/38-41-34-20/21-10-20/22-19-40
- Safety Statements
- 26-39-45-36/37/39-33-16
- RIDADR
- UN 2924 3/PG 2
- OEL
- Ceiling: 5 ppm (20 mg/m3)
- WGK Germany
- 3
- RTECS
- AK1925000
- F
- 21
- Autoignition Temperature
- 629 °F
- TSCA
- Yes
- HazardClass
- 8
- PackingGroup
- II
- HS Code
- 29152400
- Toxicity
- LD50 orally in rats: 1.78 g/kg (Smyth)
- IDLA
- 200 ppm
Use
Acetic anhydride is a colourless liquid and appreciably soluble in water. It is of ethanoic acid smell. Acetic acid anhydride is flammable, moisture sensitive, and incompatible with strong oxidising agents, water, strong bases, alcohols, metals, reducing agents, amines, ammonia, nitrates, nitric acid, permanganates, phenols, sodium hydroxide, hydrogen peroxide, chromium trioxide, potassium hydroxide, perchloric acid, and ethanol. Acetic anhydride is mainly used for the acetylation of cellulose to cellulose acetate for photographic film and other applications. Upon burning, acetic anhydride decomposes and produces toxic gases and toxic fumes including acetic acid fumes. It attacks many metals with or without the presence of water.
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