A1227912
1-Butanethiol , 97% , 109-79-5
Synonym(s):
1-Butanethiol;Butyl mercaptan;Mercaptan C4
CAS NO.：109-79-5
Empirical Formula: C4H10S
Molecular Weight: 90.19
MDL number: MFCD00004905
EINECS: 203-705-3
Update time: 2022-07-08
PRODUCT Properties
| Melting point: | −116 °C(lit.) |
| Boiling point: | 98 °C(lit.) |
| Density | 0.842 g/mL at 25 °C(lit.) |
| vapor density | 3.1 (vs air) |
| vapor pressure | 83 mm Hg ( 37.7 °C) |
| refractive index | n |
| FEMA | 3478 | 1-BUTANETHIOL |
| Flash point: | 55 °F |
| storage temp. | Store below +30°C. |
| solubility | Slightly soluble in water, soluble in alcohol and oils. |
| pka | 11.51 at 25 °C (23.0% aqueous tert-butyl alcohol, Friedman et al., 1965) |
| form | Liquid |
| color | Colorless |
| Specific Gravity | 0.842 |
| Odor | Strong skunk-like. |
| explosive limit | 1.4-11.3%(V) |
| Odor Threshold | 0.0000028ppm |
| Odor Type | sulfurous |
| Water Solubility | 0.60 g/100 mL. Slightly soluble |
| Sensitive | Air Sensitive |
| Merck | 14,1577 |
| JECFA Number | 511 |
| BRN | 1730908 |
| Henry's Law Constant | (x 10-3 atm?m3/mol):
7.04 at 20 °C (approximate - calculated from water solubility and vapor pressure) |
| Exposure limits | NIOSH REL: 15-min ceiling 0.5 ppm (1.8 mg/m3), IDLH 500 ppm; OSHA
PEL: TWA 10 ppm (35 mg/m3); ACGIH TLV: TWA 0.5 ppm (adopted). |
| Dielectric constant | 4.9500000000000002 |
| Stability: | Stable. Incompatible with oxidizing agents, bases, alkali metals. Highly flammable. May discolour on exposure to air. |
| LogP | 2.28 |
Description and Uses
Butane thiol, also known as butyl mercaptan, is a volatile, clear to yellowish liquid with a fetid (extremely foul-smelling) odor, commonly described as "skunk" odor. In fact, butanethiol is structurally similar to several major constituents of a skunk's defensive spray but is not actually present in the spray. The scent of butanethiol is so strong that the human nose can easily detect it in the air at concentrations as low as 10 parts per billion. The threshold level for 1-butane thiol is reported as 1.4 ppb.
Intermediate, solvent.
Safety
| Symbol(GHS) |   GHS02,GHS07 |
| Signal word | Danger |
| Hazard statements | H225-H302+H332-H315-H317-H319-H335 |
| Precautionary statements | P210-P280-P301+P312-P303+P361+P353-P304+P340+P312-P305+P351+P338 |
| Hazard Codes | F,Xn |
| Risk Statements | 11-20/22-36/37/38-21/22-43 |
| Safety Statements | 16-23-26-36-9-36/37-33-37-37/39 |
| RIDADR | UN 2347 3/PG 2 |
| OEL | Ceiling: 0.5 ppm (1.8 mg/m3) [15-minute] |
| WGK Germany | 3 |
| RTECS | EK6300000 |
| F | 10-13-23 |
| TSCA | Yes |
| HS Code | 2930 90 98 |
| HazardClass | 3 |
| PackingGroup | II |
| Toxicity | LD50 orally in Rabbit: 1500 mg/kg |
| IDLA | 500 ppm |
