1,4-Dichloro-2-butene

  • 2-Butene, 1,4-dichloro
  • 2-Butylene dichloride
  • 1,4-Dichlorobutene
  • 1,4-Dichloro-2-butylene
Formula
C4H6Cl2
Structure
Description
A clear colorless liquid.
Uses
Chemical intermediate for 3,4-dichloro-1-butene, adiponitrile (a hexamethylenediamine int) & chemical intermediate for 1,4-butanediol (non-us use).

Registry Numbers and Inventories.
CAS
764-41-0
EC (EINECS/ELINCS)
212-121-8
EC Index Number
602-073-00-X
EC Class
Carcinogenic Category 2; Very toxic; Toxic; Corrosive; Dangerous for the Environment
RTECS
EM4900000
RTECS class
Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
2924
Beilstein/Gmelin
1361446
RCRA
U074
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C4H6Cl2
Formula mass
125.00
Melting point, °C
-47.8
Boiling point, °C
156
Vapor pressure, mmHg
3.9 (25 C)
Vapor density (air=1)
4.0
Density
1.1882 g/cm3
Solubility in water
Slightly soluble
Surface tension
24 g/s2
Refractive index
1.4880 (20 C)
Partition coefficient, pKow
2.10
Heat of vaporization
37.6 kJ/mol
Heat of combustion
-5063 kJ/mol

Hazards and Protection.
Storage
Open venting with flame arrester.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Use water spray to knock-down vapors.
Stability
Container may explode in heat of fire. Runoff to sewer may create fire or explosion hazard.
Incompatibilities
Can react with some metals to form dangerous products Incompatible with strong oxidizing and reducing agents Incompatible with many amines, nitrides, azo/diazo compounds, alkali metals, and epoxides.
Decomposition
When heated to decomposition it emits toxic fumes of hydrogen chloride.

Fire.
Flash Point,°C
54
Fire fighting
Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Solid streams of water may be ineffective. Use foam, dry chemical, or carbon dioxide. Use water spray to knock-down vapors.
Fire potential
Corrosive material.
Hazards
If fire becomes uncontrollable or container is exposed to direct flame- evacuate for a radius of 1500 ft. If material leaking (not on fire), downwind evacuation must be considered.
Combustion products
Decomposition vapors contain phosgene and hydrogen chloride gases; both are toxic and irritating.

Health.
Exposure limit(s)
OSHA: A2. A2= Suspected human carcinogen.
Carcinogin
G-A2, CP65
Exposure effects
DCB was not teratogenic in rats.
   Ingestion
Severe irritation or burns of the esophagus or stomach may be seen.
   Inhalation
Liquid and vapor are highly irritating or corrosive to the lungs.
   Skin
Burns with severe blistering may be seen.
   Eyes
See Skin.

First aid
 
   Ingestion
Induce vomiting; call physician.
   Inhalation
Remove from exposure; provide low-pressure oxygen if required; keep under observation until edema is ruled out.
   Skin
Wash immediately and thoroughly with soap and water; treat as a chemical burn.
   Eyes
Irrigate immediately for 15 min.; call physician.

Transport.
UN number
2924
Response guide
Hazard class
3
Packing Group
I; II; III
 
USCG CHRIS Code
DCB
 
36 Halogenated hydrocarbons
Std. Transport #
4936312