Butyl mercaptan

  • 1-Butanethiol
  • n-Butanethiol
  • 1-Bercaptobutane
  • Thiobutyl alcohol
  • Butane-1-thiol
Formula
CH3(CH2)3SH
Structure
Description
Colorless liquid with a very strong offensive, garlic-, cabbage-, or skunk-like odor.
Uses
As solvent.

Registry Numbers and Inventories.
CAS
109-79-5
EC (EINECS/ELINCS)
203-705-3
EC Class
highly flammable, harmful
R 11 20/22 36/37/38
S 16 26 36/37/39
RTECS
EK6300000
RTECS class
Reproductive Effector; Primary Irritant
UN (DOT)
2347
Merck
12,1611
Beilstein/Gmelin
1730908
Beilstein Reference
4-01-00-01555
EPA OPP
125001
Swiss Giftliste 1
G-1337
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C4H10S
Formula mass
90.19
Melting point, °C
-116
Boiling point, °C
98
Vapor pressure, mmHg
155 (323 C)
Vapor density (air=1)
3.1
Saturation Concentration
46060 ppm (4.6%) at 20 C; 109200 ppm (10.9%) at 25 C (calculated)
Evaporization number
2.86 (n-butyl acetate = 1)
Odor Threshold Odor threshold 0.001 To 0.0001 ppm
Critical temperature
290
Critical pressure
38.9
Density
0.841 g/cm3 (20 C)
Solubility in water
600 mg/L
Viscosity
0.51 cp (20 C)
Surface tension
25.57 g/s2 (22 C)
Refractive index
1.44014 (20 C)
pKa/pKb
10.61 (pKa)
Partition coefficient, pKow
2.28
Heat of fusion
10.5 kJ/mol
Heat of vaporization
32.2 kJ/mol
Heat of combustion
-3474 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area. Refrigerator (approx 4 C).
B2 D1B
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Use a spark-proof tool. Provide ventilation. A vapor suppressing foam may be used to reduce vapors.
Disposal code
6
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents.
Decomposition
Carbon monoxide, oxides of sulfur, irritating and toxic fumes and gases, carbon dioxide, hydrogen sulfide.

Fire.
Flash Point,°C
12
Autoignition, °C
225
Upper exp. limit, %
10.20
Lower exp. limit, %
1.40
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Will burn if involved in a fire. Use water spray to keep fire-exposed containers cool. Water may be ineffective. Material is lighter than water and a fire may be spread by the use of water. Containers may explode in the heat of a fire. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. Water may be ineffective. Do NOT use straight streams of water.
Fire potential
Flammable liquid and vapor.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Irritating sulfur dioxide may form.
Health
1
 
Flammability
3
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: 0.5 ppm; 1.8 mg/m3 (as TWA) (ACGIH 1992-1993) OSHA PEL: TWA 10 ppm (35 mg/m3) NIOSH REL: C 0.5 ppm (1.8 mg/m3) 15-minute NIOSH IDLH: 500 ppm
Poison_Class
4
Exposure effects
Narcosis and paralysis may be caused with concentrated vapors. Drowsiness, weakness, and mild depression may be seen at exposures of 50 to 500 ppm for one hour.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Mercaptans may cause nausea and headache. Exposure to high concentrations of mercaptans can produce unconsciousness with cyanosis, cold extremities and rapid pulse. May be harmful if swallowed.
   Inhalation
May cause respiratory tract irritation. Vapors may cause dizziness or suffocation. May produce nausea in low concentration and pulmonary edema in high concentrations. Exposure to high concentrations of mercaptans can produce unconsciousness with cyanosis, cold extremities and rapid pulse. Mercaptans may cause nausea and headache.
   Skin
May cause skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
2347
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
BTM
 
HS Code
2930 90 70
 
Std. Transport #
4909133