Isobutyl acetate

  • 2-Methylpropyl acetate
  • Acetic acid isobutyl ester
  • beta-Methylpropyl ethanoate
Formula
CH3COOCH2CH(CH3)2
Structure
Description
Colorless liquid with a mild, sweet, fruity or floral odor, may be disagreeable in higher concentrations.
Uses
Used in non-alcoholic beverages.

Registry Numbers and Inventories.
CAS
110-19-0
EC (EINECS/ELINCS)
203-745-1
EC Index Number
607-026-00-7
EC Class
Highly flammable; Repeated exposure may cause skin dryness or cracking
R 11 66
S 16 23 25 29 33
RTECS
AI4025000
RTECS class
Primary Irritant
UN (DOT)
1213
Merck
13,5147
Beilstein/Gmelin
1741909
Beilstein Reference
4-02-00-00149
Swiss Giftliste 1
G-1700
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H12O2
Formula mass
116.16
Melting point, °C
-99
Boiling point, °C
118
Vapor pressure, mmHg
14 (20 C)
Vapor density (air=1)
4.0
Saturation Concentration
16450 ppm (1.65%) at 20 C (calculated)
Evaporization number
8 (diethyl ether = 1)
Odor Threshold Odor threshold 6 ppb
Critical temperature
288
Critical pressure
29.71
Density
0.8921 g/cm3 (0 C)
Solubility in water
6 g/L
Viscosity
0.69 cp (20 C)
Surface tension
23.7 g/s2
Refractive index
1.38984 (17.6 C)
Dipole moment
5.3 D (20 C)
Dielectric constant
5.3 (20 C)
Partition coefficient, pKow
1.78
Heat of vaporization
35.5 kJ/mol
Heat of combustion
-3470 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
B2
Handling
Wash thoroughly after handling. Use with adequate ventilation. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition. A vapor suppressing foam may be used to reduce vapors. Water spray may reduce vapor but may not prevent ignition in closed spaces.
Disposal code
1
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents, strong acids, alkalies, nitrates.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
18
Autoignition, °C
423
Upper exp. limit, %
10.5
Lower exp. limit, %
1.3
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Combustible Liquid. Can form explosive mixtures at temperatures above the flashpoint. Use water spray to keep fire-exposed containers cool. Containers may explode in the heat of a fire. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. Water may be ineffective. In case of fire use water spray, dry chemical, carbon dioxide, or chemical foam. Do NOT use straight streams of water.
Fire potential
HIGHLY FLAMMABLE.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Combustion products
Toxic vapors and gases (such as carbon monoxide) may be released in a fire involving isobutyl acetate.
Health
1
 
Flammability
3
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL: TWA 150 ppm (700 mg/m3) OSHA PEL: TWA 150 ppm (700 mg/m3) IDLH 1300 ppm [10%LEL]
Poison_Class
5
Exposure effects
Butyl acetates are central nervous systerm depressants and are narcotic in high concentrations, producing a wide range of neurological symptoms. N-butyl acetate has narcotic properties estimated to be 1.7 Times that of ethyl acetate. Cerebral edema and central nervous system depression have been found in animals. Concentrations of 1.4 Percent caused death in 240 minutes in animals. N-butyl acetate is among a group of solvents associated with spontaneous abortion in female workers employed in certain semiconductor manufacturing processes. However, experiments in animals have failed to demonstrate an effect of butyl acetate on reproduction.
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation. Inhalation of high concentrations may cause narcotic effects. Vapors may cause dizziness or suffocation. Inhalation of vapors may cause nausea, vomiting, dizziness, and loss of consciousness.
   Skin
May cause skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1213
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
IBA
 
HS Code
2915 34 00
 
Std. Transport #
4909207
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
P