Butadiene

Formula

CH2 = CH - CH = CH2

Description

Butadiene (1,3-Butadiene) is a flammable, colorless gas with a mild aromatic odor and it is highly reactive. Butadiene is soluble in alcohol and ether, insoluble in water and polymerizes readily, particularly if oxygen is present.

Properties

ParameterUnitQuantity
Molecular weightg/mol54.09
Densityliquid at 20°C0.6211
Freezing point°C-108.9
Boiling point°C-4.41
CAS number106-99-0
IUPACButa-1,3-diene

Specifications

ParameterUnitQuantityTest Method
Purity (1)wt %99.5 minASTM D-2593
Propadieneppm, wt10 max.ASTM D-2593
1,2 Butadieneppm, wt20 max.ASTM D-2593
Total acetylenesppm, wt20 max.ASTM D-2593
Methyl acetyleneppm, wtReportASTM D-2593
Ethyl acetyleneppm, wtReportASTM D-2593
Vinyl acetyleneppm, wtReportASTM D-2593
Butene-1 / isobutylenes-ReportASTM D-2593
Cis butene-2-ReportASTM D-2593
Trans-butene-2-ReportASTM D-2593
Total C5’sppm, wt500 max.ASTM D-2593
Sulfur (as H25)ppm, wt5 max.ASTM D-4045
Carbonyls (as CH3CHO)ppm, wt10 max.ASTM D-4423
Peroxides (as H2O2)ppm, wt5 max.-
TBC (tertiary butyl catgechol)ppm, wt75-150ASTM D-1157
Butadiene dimerppm, wt250 max.ASTM D-2426
Total atomic Nitrogen (2)ppm, wt10 max.ASTM D-4629
Water (3)ppm, wt300 max.ASTM D-1744
Solvency (n-methyl-2-pyrrolidone (NMP)ppm, wt5 max.ASTM D-2593
Oxygen in vapors (3)vol %0.1 max.
(1) Purity is obtained by subtracting all the hydrocarbon impurities as obtained by ASTM D-2593. (2) On request only. (3) For export shipment only. Note: - ASTM : American Society for Testing and Materials.

Hazards and safety

Irritant in high concentration. A suspected human carcinogen.

ParameterUnitQuantity
Explosion limits in air2-11.5%
Ignition point°C429
Flash point°C-76
UN or ID No1010

Applications

One major use of butadiene has been in the making of synthetic rubber (styrene-butadiene and nitrile butadiene rubbers, to a large extent, CIS-polybutadiene is also an extender and substitute for rubber, and polymerizations transpolybutadiene is a type of rubber with unusual properties). Butadiene is also used extensively for various polymerizations for plastics manufacturing. Copolymers with high proportions of styrene have found applications such as stiffening resins for rubber, in water-base and other paints, and in high impact plastic. Butadiene also serves as a starting material for nylon 66 (adiponitrile) and an ingredient in rocket fuel (butadiene - acrylonitrile polymer).

Storage and handling

Contact with oxidizing agent may cause ignition. Steel is recommended for tanks and piping in butadiene service, and it is usually stored under pressure or in insulated tanks at reduced temperature, preferably below 1.6°C (35°F). Goggles, rubber gloves and protective clothing should be worn, and self-contained breathing apparatus should be used.

Cryogenic tankers.

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