Butylene

  • Butene
  • n-Butene
  • 1-Butene
  • alpha-Butylene
  • n-Butylene
  • Ethylethylene
Formula
C4H8
Structure
Description
Colorless gas.
Uses
Chemical intermediate for butadiene used primarily to manufacture elastomers, for sec-butanol used to manufacture methyl ethyl ketone, for primary amyl alcohols used to manufacture solvents, for butylene oxide-eg, used as an acid scavenger, and for ethylene-butylene copolymer.

Registry Numbers and Inventories.
CAS
106-98-9
EC (EINECS/ELINCS)
246-689-3
RTECS
EM2893000
UN (DOT)
1012
Beilstein/Gmelin
1754867
Beilstein Reference
4-04-00-01274
Swiss Giftliste 1
G-7569
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C4H8
Formula mass
56.11
Melting point, °C
-185
Boiling point, °C
-6.3
Vapor pressure, mmHg
2210 (25 C)
Vapor density (air=1)
2.0
Critical temperature
144
Critical pressure
39.7
Density
2.37 g/cm3 (25 C, liquid)
Solubility in water
Insoluble
Viscosity
0.0025 g/(cm.s) (-35 C)
Surface tension
12.6 g/c2
Refractive index
1.6088 (20 C)
Dipole moment
0.37 D
Partition coefficient, pKow
2.37
Heat of fusion
38.5 kJ/mol
Heat of vaporization
20.4 kJ/mol
Heat of combustion
-2719 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
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 protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
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. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
No data.
Incompatibilities
Incompatible with strong oxidizing agents, halogens, halogen acids, metal salts, boron trifluoride, fluorine, nitrogen oxides.

Fire.
Flash Point,°C
-49
Autoignition, °C
385
Upper exp. limit, %
10
Lower exp. limit, %
1.6
Fire fighting
Do not extinguish fire unless flow can be stopped. 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.
Fire potential
Flammable gas. Very dangerous fire hazard when exposed to heat, flame, or oxidizers.
Hazards
Containers may explode in fire. Vapor is heavier than air and may travel long distance to a source of ignition and flash back.
Health
1
 
Flammability
4
 
 
Reactivity
0
 

Health.
Exposure effects
Rapid breathing and rapid heart rate are common. In severe cases abnormally low blood pressure, apnea, and cardiac arrest develop. Various disturbances including headache, dizziness, mood disturbances, numbness of the extremities, sleepiness, mental confusion, poor judgement and coordination, and memory loss may occur. Prolonged or severe hypoxia results in unconsciousness. Prolonged asphyxia may produce CNS injury. Hemiparesis has been reported with volatile substance abuse. Cerebral edema with brainstem herniation may occur. Seizures have been reported following intentional inhalation.
   Ingestion
Nausea, vomiting, and gastrointestinal hemorrhage may develop.
   Inhalation
Hyperventilation may develop.
   Skin
Dermal exposure may cause frostbite injury. Severe tissue burns have been reported.
   Eyes
Decreases in night vision, visual acuity, and visual fields (tunnel vision) may occur. Frothy mucous may be seen.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Remove victim to fresh air and apply resuscitation. Call a doctor.
   Skin
Flush with water for at least 15 minutes.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
1012
Response guide
Hazard class
2.1
USCG CHRIS Code
BTN
 
Std. Transport #
4905715 4905426
 
IMO Gas Code
B