2-Ethylbutyric acid

  • Butanoic acid, 2-ethyl
  • Diethylacetic acid
  • 2-Ethyl-n-butyric acid
  • 3-Pentanecarboxylic acid
  • Acetic acid, diethyl
Formula
C2H5CH(C2H5)COOH
Structure
Description
Water-white liquid with a faint, unpleasant, fatty odor resembling butyric acid.
Uses
Used in flavourings; as an intermediate for pharmaceuticals and dyestuffs; in the manufacture of esters and other chemicals.

Registry Numbers and Inventories.
CAS
88-09-5
EC (EINECS/ELINCS)
201-796-4
EC Class
harmful, irritant
R 21 34
S 26 36/37/39 45
RTECS
ET1400000
RTECS class
Other
UN (DOT)
2810
Merck
13,3137
Beilstein/Gmelin
1098634
Beilstein Reference
4-02-00-00950
EPA OPP
431700
Swiss Giftliste 1
G-2215
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
-14
Boiling point, °C
193 - 194
Vapor pressure, mmHg
0.18 (25 C)
Saturation Concentration
Approximately 105 ppm (0.0105%) at 25 C (calculated)
Density
0.9355 g/cm3 (0 C)
Solubility in water
18 g/L
Viscosity
3.3 MPa
Refractive index
1.4112 (20 C)
pKa/pKb
4.80 (pKa)
Partition coefficient, pKow
1.66 (25 C)
Heat of vaporization
47.6 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. Corrosives area.
B3 D1B D2B
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Do not get on skin or in eyes. 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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
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. Remove all sources of ignition. Provide ventilation.
Disposal code
4
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Bases, strong oxidizing agents, strong reducing agents.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
87
Autoignition, °C
385
Upper exp. limit, %
8.4
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. Use water spray to keep fire-exposed containers cool. Water may be ineffective. Material is lighter than water and a fire may be spread by the use of water. Combustible Liquid. Extinguishing media: Use water spray to cool fire-exposed containers. In case of fire, use carbon dioxide, dry chemical powder or appropriate foam.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
May cause narcotic effects in high concentration. Causes irritation of mucous membrane.
   Skin
Causes mild skin irritation. Harmful if absorbed through the skin.
   Eyes
Causes severe 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.
   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. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately 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
2810
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
4. Organic acids
HS Code
2915 90 80