trans-Crotonaldehyde

  • (E)-2-Butenal
  • trans-2-Butenal
  • Crotenaldehyde
  • Crotonaldehyde
  • beta-Methylacrolein
Formula
C4H6O
Structure
Description
Water-white, mobile liquid. Pungent, suffocating odor.
Uses
Chemical intermediate for n-butyl alcohol, quinaldine, crotonic acid, surface-active agents, textile & paper sizes, insecticides & flavoring agents, fuel-gas warning agent, solvent for polyvinyl chloride, alcohol denaturant, leather tanning agent.

Registry Numbers and Inventories.
CAS
123-73-9
EC (EINECS/ELINCS)
204-647-1
EC Index Number
605-009-00-9
EC Class
Highly flammable; Mutagenic Category 3; Very toxic; Toxic; Harmful; Irritant; Dangerous for the Environment
R 11 24/25 26 37/38 41 48/22 50 68
S 26 28 36/37/39 45 61
RTECS
GP9625000
RTECS class
Mutagen; Human Data; Primary Irritant
UN (DOT)
1143
Merck
13,2624
Beilstein/Gmelin
906731
Beilstein Reference
3-01-00-02968
RCRA
U053
Swiss Giftliste 1
G-1441
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C4H6O
Formula mass
70.10
Melting point, °C
-73.9
Boiling point, °C
102
Vapor pressure, mmHg
38 (20 C)
Vapor density (air=1)
2.41
Odor Threshold Odor threshold 0.5 ppm
Density
0.853 g/cm3 (20 C)
Solubility in water
more than 50 g/100 ml
Refractive index
1.4366 (20 C)
Heat of vaporization
38.9 kJ/mol
Heat of combustion
-2268 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container. Keep under a nitrogen blanket. Flammables-area.
Handling
Use spark-proof tools and explosion proof equipment. Do not breathe dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Take precautionary measures against static discharges. Use only in a chemical fume hood. Store and handle protected from air.
Protection
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. Use a spark-proof tool.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents, reducing agents, bases, acids (mineral, non-oxidizing, e.g. hydrochloric acid, hydrofluoric acid, muriatic acid, phosphoric acid), acids (mineral, oxidizing, e.g. chromic acid, hypochlorous acid, nitric acid, sulfuric acid), caustics (e.g. ammonia, ammonium hydrozide, calcium hydroxide, potassium hydroxide, sodium hydroxide).
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
13
Autoignition, °C
232
Upper exp. limit, %
15.5
Lower exp. limit, %
2.1
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. Extinguishing media: Use water spray to cool fire-exposed containers. Use foam, dry chemical, or carbon dioxide.
Fire potential
Fire hazard when exposed to heat or flame; can react with oxidizing materials.
Hazards
Vapors form explosive mixtures in air or in sewers. Hazardous peroxides and acids emitted when heated to decomposition. Avoid nitric acid. Unstable, avoid oxygen, heat, elevated pressures. Hazardous polymerization may occur. Avoid contact with alkaline materials such as caustic ammonia or amines, or at elevated temperatures.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
4
 
Flammability
3
 
 
Reactivity
2
 

Health.
Poison_Class
2
Exposure effects
Seizures have been observed as a terminal event in exposed rats. Chronically exposed Russian workers developed unspecified sexual disturbances, decreased androgenous function of the male endocrine glands, and menstrual disturbances.
   Ingestion
Harmful if swallowed.
   Inhalation
Causes respiratory tract irritation. May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema. Toxic if inhaled.
   Skin
Causes skin irritation. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. Substance is rapidly absorbed through the skin. Causes redness and pain.
   Eyes
Causes eye irritation. Contact with liquid or vapor causes severe burns and possible irreversible eye damage. Lachrymator. Causes redness and pain. Lachrymator.

First aid
 
   Ingestion
Induce vomiting. Get medical aid immediately. Wash mouth out with water.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   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
1143
Response guide
Hazard class
6.1
Packing Group
I