Thionyl chloride

  • Sulfurous oxychloride
  • Sulfinyl chloride
  • Sulfur chloride oxide
  • Sulfurous dichloride
  • Thionyl dichloride
Formula
SOCl2
Structure
Description
Colorless to yellow to reddish liquid with a pungent odor of sulfur dioxide.
Uses
For making acyl chlorides, to replace hydroxide of sulfhydryl groups with chlorine atoms.

Registry Numbers and Inventories.
CAS
7719-09-7
EC (EINECS/ELINCS)
231-748-8
EC Index Number
016-015-00-0
EC Class
Reacts violently with water; Harmful; Contact with water liberates toxic gas; Corrosive
R 14 20/22 29 35
S 26 36/37/39 45
RTECS
XM5150000
RTECS class
Other
UN (DOT)
1836
Merck
12,9485
Beilstein/Gmelin
1699 (G)
Swiss Giftliste 1
G-2943
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
Cl2OS
Formula mass
118.97
Melting point, °C
-104.5
Boiling point, °C
76
Vapor pressure, mmHg
97 (20 C)
Vapor density (air=1)
4.1
Saturation Concentration
130,000 ppm (13%) at 21 C (calculated)
Density
1.64 g/cm3 (20 C)
Solubility in water
Reacts
Viscosity
0.801 C
Refractive index
1.517 (20 C)
Partition coefficient, pKow
0.68
Heat of vaporization
31.7 kJ/mol

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. Corrosives area. Keep away from acids. Do not store in metal containers.
Handling
Keep container tightly closed. Do not get on skin or in eyes. Do not ingest or inhale. Use with adequate ventilation. Do not allow contact with water. Discard contaminated shoes.
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 nitrile-latex gloves, apron, and/or clothing. Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear nitrile-latex gloves, apron, and/or clothing. Wear appropriate protective clothing to minimize contact with skin.
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
Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Use water spray to disperse the gas/vapor. Use a spark-proof tool. Do not get water inside containers. Cover with dry earth, dry sand, or other non-combustible material followed with plastic sheet to minimize spreading and contact with water.
Disposal code
24
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Water, metals, ammonia, dimethyl sulfoxide, dimethyl formamide, lithium, sodium, alkalies.
Decomposition
Hydrogen chloride, chlorine, oxides of sulfur, irritating and toxic fumes and gases.

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. Water Reactive. Material will react with water and may release a flammable and/or toxic gas. Containers may explode in the heat of a fire. Contact with metals may evolve flammable hydrogen gas. Extinguishing media: Do NOT use water directly on fire. If water is the only media available, use in flooding amounts. Do NOT get water inside containers. Cool containers with flooding quantities of water until well after fire is out. For small fires, use dry chemical or carbon dioxide.
Fire potential
May burn but does not ignite readily.
Hazards
May ignite combustibles (wood, paper, oil, clothing, etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases. Flammable/toxic gases may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.)Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. Substance may be transported in a molten form.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases. Reaction with water may generate much heat which will increase the concentration of fumes in the air.
Health
4
 
Flammability
0
 
 
Reactivity
2
 
 
Special
W

Health.
Exposure limit(s)
NIOSH REL: C 1 ppm (5 mg/m3)
Poison_Class
1
Exposure effects
   Ingestion
May cause severe and permanent damage to the digestive tract. Causes gastrointestinal tract burns.
   Inhalation
Harmful if inhaled. Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
   Skin
Causes skin burns. Causes redness and pain.
   Eyes
Causes eye burns. Causes redness and pain. Lachrymator.

First aid
 
   Ingestion
Do NOT induce vomiting. 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 breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
1836
Response guide
Hazard class
8
PRTC
T
Packing Group
I
 
USCG CHRIS Code
TNC
 
HS Code
2812 10 95
 
Std. Transport #
4930061