2-Ethylhexanoic acid

  • 2-Ethylcaproic acid
  • 2-Ethylhexoic acid
  • 3-Heptanecarboxylic acid
  • 2-Butylbutanoic acid
  • Butylethylacetic acid
Formula
CH3(CH2)3CH(C2H5)COOH
Structure
Description
Colorless liquid with a characteristic odor.
Uses
Cosolvent and defoamer in pesticides.

Registry Numbers and Inventories.
CAS
149-57-5
EC (EINECS/ELINCS)
205-743-6
EC Index Number
607-230-00-6
EC Class
Toxic for reproduction Category 3
RTECS
MO7700000
RTECS class
Mutagen; Reproductive Effector; Primary Irritant
UN (DOT)
1738
Beilstein/Gmelin
1750468
Beilstein Reference
3-10-00-01641
EPA OPP
445200
Swiss Giftliste 1
G-2143
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H16O2
Formula mass
144.22
Melting point, °C
-82.8
Boiling point, °C
228
Vapor pressure, mmHg
0.03 (25 C)
Vapor density (air=1)
5.0
Saturation Concentration
Approximately 40 ppm (0.004%) at 20 C (calculated)
Critical temperature
402
Critical pressure
27.44
Density
0.908 g/cm3 (15 C)
Solubility in water
Soluble
Viscosity
7.8 MPa s
Refractive index
1.4735
pKa/pKb
4.82 (pKa)
Partition coefficient, pKow
2.64
Heat of vaporization
51.2 kJ/mol

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances.
D2A D2B
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
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. Clean up spills immediately, using the appropriate protective equipment. Provide ventilation.
Disposal code
4
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents, reducing agents, bases.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
114
Autoignition, °C
310
Upper exp. limit, %
6.7
Lower exp. limit, %
0.9
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
This chemical is combustible.
Hazards
Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Contact with metals may evolve flammable hydrogen gas.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Possible risk of harm to the unborn child.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
May cause respiratory tract irritation.
   Skin
Causes skin irritation. May be harmful if absorbed through the skin.
   Eyes
May cause 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
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   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
1738
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
EHO
 
HS Code
2915 90 80
 
Std. Transport #
4932042
 
IMO Chemical Code
18
IMO Pollution Category
D