Isopropyl mercaptan

  • 2-Propanethiol
  • Propane-2-thiol
Formula
(CH3)2CHSH
Structure
Description
Colorless liquid, strong offensive, skunk odor.
Uses
Standard for petroleum analysis, intermediate.

Registry Numbers and Inventories.
CAS
75-33-2
EC (EINECS/ELINCS)
200-861-4
EC Class
highly flammable, harmful, irritant
R 11 22 36/37/38
S 9 16 23.2
RTECS
TZ7302000
RTECS class
Other
UN (DOT)
2402
Beilstein/Gmelin
605260
Beilstein Reference
4-01-00-01498
Swiss Giftliste 1
G-8023
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H8S
Formula mass
76.16
Melting point, °C
-130
Boiling point, °C
57
Vapor pressure, mmHg
246 (25 C)
Saturation Concentration
36.5% at 25 C (calculated)
Evaporization number
Probably rapid. No specific information available.
Critical temperature
271
Critical pressure
49
Density
0.8356 g/cm3 (0 C)
Solubility in water
Slightly soluble
Viscosity
0.37 cp (20 C)
Surface tension
22.25 g/s2 (17 C)
Refractive index
1.4255 (20 C)
Dipole moment
5.95 D
pKa/pKb
10.69
Partition coefficient, pKow
1.48
Heat of fusion
5.7 kJ/mol
Heat of vaporization
27.9 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.
B2
Handling
Wash thoroughly after handling. Use with adequate ventilation. Ground and bond containers when transferring material. 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. Remove all sources of ignition. A vapor suppressing foam may be used to reduce vapors. Water spray may reduce vapor but may not prevent ignition in closed spaces.
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
-34
Autoignition, °C
440
Lower exp. limit, %
1.8
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Extremely flammable liquid. Containers may explode when heated. Extinguishing media: Use water spray to cool fire-exposed containers. Do NOT use straight streams of water. For small fires, use dry chemical, carbon dioxide, water spray or regular foam. Cool containers with flooding quantities of water until well after fire is out. For large fires, use water spray, fog or regular foam.
Fire potential
Highly flammable, dangerous fire hazard.
Hazards
Vapor is heavier than air and may travel to a source of ignition and flash back.
Combustion products
Irritating sulfur dioxide gas is formed in fire.

Health.
Poison_Class
4
Exposure effects
Chronic inhalation may cause effects similar to those of acute inhalation.
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
Causes respiratory tract irritation. May cause nausea, dizziness, and headache. Exposure to high concentrations of mercaptans can produce unconsciousness with cyanosis, cold extremities and rapid pulse.
   Skin
Causes skin irritation. May cause contact dermatitis.
   Eyes
Causes eye irritation. Vapors 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
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   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
2402
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
IPM
 
HS Code
2930 90 70