Sulfur trioxide pyridine complex

  • Pyridine, compound with sulfur trioxide (1:1)
Formula
C5H5N.O3S
Structure
Description
White to beige powder.

Registry Numbers and Inventories.
CAS
26412-87-3
EC (EINECS/ELINCS)
247-683-3
EC Class
harmful, irritant
R 22 34
S 26 36/37/39 45
UN (DOT)
3261
Beilstein/Gmelin
3704116
Beilstein Reference
5-20-05-00184
Canada DSL/NDSL
NDSL
US TSCA
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C5H5NO3S
Formula mass
159.16
Melting point, °C
155 - 165
Solubility in water
Decomposition

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from water.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal.
Disposal code
12
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Metals, strong oxidizing agents, moisture, diphenylmercury.
Decomposition
Nitrogen oxides, carbon monoxide, oxides of sulfur, irritating and toxic fumes and gases, carbon dioxide, nitrogen.

Fire.
Autoignition, °C
> 350
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. To extinguish fire, use water spray, dry chemical, carbon dioxide, or alcohol-resistant foam.

Health.
Exposure effects
   Ingestion
May be harmful if swallowed. Causes digestive tract irritation.
   Inhalation
Causes respiratory tract irritation. Causes irritation of mucous membrane.
   Skin
Causes mild skin irritation.
   Eyes
Causes severe 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
3261
Response guide
HS Code
2942 00 00