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CAS 106-97-8
EINECS(EC#) 203-448-7
Molecular Formula C4H10
MDL Number MFCD00009424
Molecular Weight 58.12
MOL File 106-97-8.mol

Chemical Properties

Appearance colourless gas
Melting point  −138 °C(lit.)
Boiling point  −0.5 °C(lit.)
density  0.579 g/mL at 20 °C(lit.)
vapor density  2.11 (vs air)
vapor pressure  3.21, 1.26, and 0.66 mM at 4, 25, and 50 °C, respectively (Kresheck et al., 1965)
refractive index  1.3326
Fp  45
form  gas
Odor faint disagreeable odor
Stability: Stable. Extremely flammable. Readily forms explosive mixtures with air. Note low flash point. Incompatible with strong oxidizing agents, strong acids, strong alkalies.
Odor Threshold 1200ppm
Water Solubility  73.24mg/L(25 ºC)
Merck  1515
BRN  969129
Henry's Law Constant (atm?m3/mol): 0.356 at 5 °C, 0.454 at 10 °C, 0.568 at 15 °C, 0.695 at 20 °C, 0.835 at 25 °C (Ben-Naim et al., 1973)
Dielectric constant 1.4(-1℃)
Exposure limits TLV-TWA 800 ppm (~1920 mg/m3) (ACGIH), 500 ppm (1200 mg/m3) (MSHA).
LogP 2.890
n-Butane can be obtained from natural gas and from refinery hydro cracker streams. Most of the n-butane goes into fuel additive uses. The major chemical use is as a feedstock for ethylene production by cracking . The other important chemical uses for butane are in oxidation to acetic acid and in the production of maleic anhydride. In the past, butane also was the main feedstock for the production of butadiene by dehydrogenation, but it has been replaced by coproduct butadiene obtained from ethylene production.
Ethylene. The largest potential chemical market for n-butane is in steam cracking to ethylene and coproducts. n-Butane is a supplemental feedstock for olefin plants and has accounted for 1-4 percent of total ethylene production for most years since 1970. It can be used at up to 10-15 percent ofthe total feed in ethane/propane crackers with no major modifications . n-Butane can also be used as a supplemental feed at as high as 20-30 percent in heavy naphtha crackers. The consumption of C4S has fluctuated considerably from year to year since 1970, depending on the relative price ofbutane and other feedstocks. The yield of ethylene is only 36-40 percent, with the other products including methane, propylene, ethane, and butadiene, acetylene, and butylenes. About 2-3 billion Ib of butane are consumed annually to produce ethylene.
CAS DataBase Reference 106-97-8(CAS DataBase Reference)
EPA Substance Registry System Butane (106-97-8)

Safety Data

Hazard Codes  F+,F
Risk Statements 
R12:Extremely Flammable.
Safety Statements 
S9:Keep container in a well-ventilated place .
S16:Keep away from sources of ignition-No smoking .
RIDADR  UN 2037 2.1
WGK Germany  -
RTECS  EJ4200000
Hazard Note  Extremely Flammable
DOT Classification 2.1 (Flammable gas)
HazardClass  2.1
HS Code  2901100000
Safety Profile
Mildly toxic by inhalation. Causes drowsiness. An asphyxlant. Very dangerous fire hazard when exposed to heat, flame, or oxidizers. Highly explosive when exposed to flame, or when mixed with [Ni(CO)4 + O2]. To fight fire, stop flow of gas. When heated to decomposition it emits acrid smoke and fumes.
Hazardous Substances Data 106-97-8(Hazardous Substances Data)
LC50 (inhalation) for mice 680 gm/m3/2-h, rats 658 gm/m3/4-h (quoted, RTECS, 1985).
IDLA 1,600 ppm (>10% LEL)

Hazard Information

Material Safety Data Sheet(MSDS)

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