99% , 106-97-8
Synonym(s):
n-Butane
CAS NO.：106-97-8
Empirical Formula: C4H10
Molecular Weight: 58.12
MDL number: MFCD00009424
EINECS: 203-448-7
PRODUCT Properties
| 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 |
| Flash point: | 45 |
| form | gas |
| Odor | faint disagreeable odor |
| 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). |
| Stability: | Stable. Extremely flammable. Readily forms explosive mixtures with air. Note low flash point. Incompatible with strong oxidizing agents, strong acids, strong alkalies. |
| LogP | 2.890 |
Description and Uses
Butane is a flammable, colorless gas that follows propane in the alkane series. Butane is also called n-butane, with the “n” designating it as normal butane, the straight chain isomer. Butane’s other isomer is isobutane. The chemical name of isobutane is 2-methylpropane. Isomers are different compounds that have the same molecular formula. Normal butane and isobutane are two different compounds, and the name butane is used collectively to denote both n-butane and isobutane; the names n-butane and isobutane are used to distinguish properties and chemical characteristics unique to each compound. Butane, along with propane, is a major component of liquefied petroleum gas . It exists as a liquid under moderate pressure or below 0℃ at atmospheric pressure, which makes it ideal for storage and transportation in liquid form.
Butane is the common fuel used in cigarette lighters and also as an aerosol propellant, a calibration gas, a refrigerant, a fuel additive, and a chemical feedstock in the petrochemical industry.
Safety
| Symbol(GHS) |   GHS02,GHS04 |
| Signal word | Danger |
| Hazard statements | H220-H280 |
| Precautionary statements | P410+P403 |
| Hazard Codes | F+,F,T |
| Risk Statements | 12-46-45 |
| Safety Statements | 9-16-45-53 |
| OEB | A |
| OEL | TWA: 800 ppm (1900 mg/m3) |
| RIDADR | UN 2037 2.1 |
| WGK Germany | - |
| RTECS | EJ4200000 |
| F | 4.5-31 |
| Hazard Note | Extremely Flammable |
| DOT Classification | 2.1 (Flammable gas) |
| HazardClass | 2.1 |
| HS Code | 2901100000 |
| Toxicity | LC50 (inhalation) for mice 680 gm/m3/2-h, rats 658 gm/m3/4-h (quoted, RTECS, 1985). |
| IDLA | 1,600 ppm (>10% LEL) |
