2-BUTENE Property

Melting point:

−140 °C(lit.)

Boiling point:

1 °C(lit.)

Density 

0.5990

vapor density 

2 (vs air)

vapor pressure 

2575 mm Hg ( 37.7 °C)

refractive index 

1.3932

Flash point:

<−30 °F

explosive limit

9.7%

Merck 

1520

BRN 

1718756

Stability:

Stable. Incompatible with strong oxidizing agents, peroxides, peroxyacids, aluminium tetrahydroborate. Extremely flammable.

InChIKey

IAQRGUVFOMOMEM-ONEGZZNKSA-N

CAS DataBase Reference

624-64-6(CAS DataBase Reference)

EPA Substance Registry System

trans-2-Butene (624-64-6)

Safety

Hazard Codes 

F,F+

Risk Statements 

12-11

Safety Statements 

9-16-33-38

RIDADR 

UN 1012 2.1

WGK Germany 

3

RTECS 

EM2932000

Autoignition Temperature

615 °F

DOT Classification

2.1 (Flammable gas)

HazardClass 

2.1

HS Code 

2901230000

Hazardous Substances Data

624-64-6(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H220Extremely flammable gas

H280Contains gas under pressure; may explode if heated

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P410+P403Protect from sunlight. Store in a well-ventilated place.

2-BUTENE Chemical Properties,Usage,Production

Chemical Properties

colourless gas

Chemical Properties

2-Butene, C4H8, can occur in trans or cis conformation; the former is the more stable form. It is a colorless, extremely flammable gas. 2-Butene occurs in coal gas and has been detected in diesel exhaust. The more highly reactive trans-2-butene occurs at much lower concentrations in the atmosphere than other comparable hydrocarbons.

Uses

trans-2-Butene can be used as a monomer unit to produce high molecular weight polyolefins with well-defined microstructures by nickle-catalyzed polymerization reaction. It is also used as a reactant in the isomerization reaction to produce the corresponding isomer using acid-activated catalysts.

Definition

ChEBI: But-2-ene is a butene.

Production Methods

2-Butene has been recovered from refining gases or produced by petroleum cracking. It is a component in the production of gasolines, butadiene, and a variety of other chemicals.

General Description

A colorless liquefied petroleum gas. An asphyxiant. Flammability limits of 1.8-9% by volume.

Air & Water Reactions

Highly flammable. Insoluble in water.

Reactivity Profile

The unsaturated aliphatic hydrocarbons, such as 2-BUTENE, are generally much more reactive than the alkanes. Strong oxidizers may react vigorously with them. Reducing agents can react exothermically to release gaseous hydrogen. In the presence of various catalysts (such as acids) or initiators, compounds in this class can undergo very exothermic addition polymerization reactions. Aluminum borohydride reacts with alkenes and in the presence of oxygen, combustion is initiated even in the absence of moisture.

Purification Methods

The gas is dried with CaH2 and purified by gas chromatography. [Beilstein 1 H 205, 1 II 176, 1 III 730, 1 IV 781.] HIGHLY FLAMMABLE.