Amyl mercaptan

  • 1-Pentanethiol
  • Pentyl mercaptan
  • Pentane-1-thiol
  • Amyl thioalcohol
  • Amyl hydrosulfide
Formula
CH3(CH2)3CH2SH
Structure
Description
Water-white to light yellow liquid with a strong, offensive, garlic-like odor.
Uses
Synthesis of organic sulfur compound, chief constituent of odorant used in gas lines to locate leaks mixture of isomers.

Registry Numbers and Inventories.
CAS
110-66-7
EC (EINECS/ELINCS)
203-789-1
EC Class
highly flammable
R 11 20/22
S 16 23 36/37
RTECS
SA3150000
RTECS class
Other
UN (DOT)
1111
Merck
12,653
Beilstein/Gmelin
1730979
Beilstein Reference
4-01-00-01653
EPA OPP
100701
Swiss Giftliste 1
G-4146
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C5H12S
Formula mass
104.22
Melting point, °C
-76
Boiling point, °C
127
Vapor pressure, mmHg
14
Vapor density (air=1)
3.59
Saturation Concentration
1.82% at 25 C (calculated)
Odor Threshold Odor threshold 0.3 mg/m3
Critical temperature
321
Critical pressure
34.5
Density
0.8595 g/cm3 (0 C)
Solubility in water
Insoluble
Surface tension
22.69 g/s2 (24 C)
Refractive index
1.4439 (20 C)
pKa/pKb
10.61 (pKa)
Partition coefficient, pKow
2.84
Heat of fusion
17.5 kJ/mol
Heat of vaporization
41.4 kJ/mol
Heat of combustion
-4122 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.
B2 D1B
Handling
Wash thoroughly after handling. 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
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. 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. Water spray may reduce vapor but may not prevent ignition in closed spaces.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Nitric acid.
Decomposition
Carbon monoxide, oxides of sulfur, carbon dioxide, hydrogen sulfide.

Fire.
Flash Point,°C
18
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. Containers may explode in the heat of a fire. May polymerize explosively when involved in 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. Water may be ineffective. Do NOT use straight streams of water. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Flammable, dangerous fire risk. Mixture of isomers dangerous, when exposed to heat or flame. Technical butanethiol (containing 28% of propane- and 7% of pentanethiols) is hypergolic with 96% acid.
Hazards
Vapor is heavier than air and may travel considerable distance to a source of ignition and flash back. Containers may explode in fire.
Combustion products
Sulfur dioxide gas is formed Vapor is heavier than air and may travel considerable distance to a source of ignition and flash back.
Health
2
 
Flammability
3
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL: C 0.5 ppm (2.1 mg/m3) [15-minute]
Poison_Class
4
Exposure effects
   Ingestion
May cause digestive tract disturbances. The toxicological properties of this substance have not been fully investigated.
   Inhalation
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated. Vapors may cause dizziness or suffocation.
   Skin
May cause allergic contact dermatitis.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   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 immediately.

Transport.
UN number
1111
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
AMM
 
36 Halogenated hydrocarbons
HS Code
2930 90 70
 
Std. Transport #
4909119