trans-2-Butene

  • 2-Butene, (E)
  • trans-Dimethylethylene
  • beta-trans-Butylene
  • (E)But-2-ene
Formula
C4H8
Structure
Description
A colorless gas with a faint aromatic odor.
Uses
Solvent, cross-linking agent, polymer gasoline, butadiene synth, synth of c4 and c5 derivatives.

Registry Numbers and Inventories.
CAS
624-64-6
EC (EINECS/ELINCS)
210-855-3
EC Index Number
601-012-00-4
EC Class
Extremely flammable
UN (DOT)
1012
Beilstein/Gmelin
1718756
Beilstein Reference
4-01-00-00781
Swiss Giftliste 1
G-7571
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
-105.5
Boiling point, °C
0.88
Vapor pressure, mmHg
1750 (25 C)
Vapor density (air=1)
1.94
Odor Threshold Odor threshold 2700 mg/m3
Critical temperature
155
Critical pressure
40.5
Density
0.6042 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
0.0084 cp (50 C)
Surface tension
0.0132 g/s2 @ 25 C
Refractive index
1.3848 (-25C)
Partition coefficient, pKow
2.31
Thermal expansion
0.0022/K at 20 C
Heat of vaporization
21.37 kj/mol
Heat of combustion
-2708 kJ/mol

Hazards and Protection.
Storage
Store and handle in accordance with all current regulations and standards.
Handling
Handle in accordance with all current regulations and standards.
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
Make no contact with the spilled material. ELIMINATE all ignition sources, combustibles and ground all equipment. Take up with sand or other noncombustible absorbent material and place into containers for later disposal.
Stability
Stable at normal temperatures and pressure.
Incompatibilities
May react vigorously with strong oxidizers Can react exothermically to release gaseous hydrogen Reacts with alkenes and in the presence of oxygen, combustion is initiated even in the absence of moisture.
Decomposition
Oxides of carbon

Fire.
Flash Point,°C
-73
Autoignition, °C
324
Upper exp. limit, %
9.7
Lower exp. limit, %
1.8
Fire fighting
Very dangerous, when exposed to heat or flame. Stop flow of gas. Extinguish fire with carbon dioxide, regular dry chemical.
Fire potential
Flammable gas. May cause flash fire.
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Containers may explode when heated.
Health
2
 
Flammability
4
 
 
Reactivity
1
 

Health.
Exposure limit(s)
800 ppm
Poison_Class
5
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
Vomiting, headache, symptoms of drunkenness, disorientation, suffocation, convulsions, coma. 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
Administer 100% humidified supplemental oxygen with assisted ventilation as required. If hypoxia has been severe or prolonged, carefully evaluate for neurologic sequelae and provide supportive treatment as indicated.
   Skin
Rewarming and a variety of topical treatments are indicated for frostbite injury. See main section for more information.
   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