Chlorosulfonic acid

  • Sulfuric chlorohydrin
  • Monochlorosulfonic acid
  • Monochlorosulfuric acid
  • Sulfuric acid chlorohydrin
Formula
HSO3Cl
Structure
Description
Clear to cloudy, colorless to pale yellow liquid with a sharp, pungent odor, hygroscopic.
Uses
Chemical intermediate for dyes, pesticides incl disul & tedion, ion-exchange resins, pharmaceuticals incl sulfa drugs & saccharin, alkyl sulfate surfactants, alkylphenol ethoxylate sulfate surfactants, component of fs military screening smoke.

Registry Numbers and Inventories.
CAS
7790-94-5
EC (EINECS/ELINCS)
232-234-6
EC Index Number
016-017-00-1
EC Class
Reacts violently with water; Corrosive; Irritant
R 14 35 37
RTECS
FX5730000
RTECS class
Other
UN (DOT)
1754
Merck
12,2218
Beilstein/Gmelin
81985 (G)
Swiss Giftliste 1
G-1423
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
ClHO3S
Formula mass
116.52
Melting point, °C
-80
Boiling point, °C
152
Vapor pressure, mmHg
8.7 (20 C)
Vapor density (air=1)
4.02
Saturation Concentration
1300 ppm at 32 C (calculated)
Odor Threshold Odor threshold 1-5 ppm
Density
1.75 g/cm3 (20 C)
Solubility in water
Very soluble
Viscosity
3 cP 16 C
Refractive index
1.437 (20 C)
Partition coefficient, pKow
0.11
Heat of vaporization
53.6 kJ/mol

Hazards and Protection.
Storage
Do not store near combustible materials. 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. Keep away from water. Keep away from acids. Do not store in metal containers. Do not store near alkaline substances. Storage for long periods is not recommended.
C D1A E F
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Do not allow water to get into the container because of violent reaction. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with clothing and other combustible materials. Do not ingest or inhale. Do not allow contact with water. 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 a chemical apron. 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
Avoid generating dusty conditions. Neutralize spill with sodium bicarbonate. Remove all sources of ignition. Absorb spill using an absorbent, non-combustible material such as earth, sand, or vermiculite. Provide ventilation. Do not expose spill to water. Do not get water inside containers.
Disposal code
12
Stability
Stable under normal temperatures and pressures. May decompose on exposure to moist air or water.
Incompatibilities
Acids, bases, alcohols, amines, finely powdered metals, plastics, rubber.
Decomposition
Hydrogen chloride, oxides of sulfur, irritating and toxic fumes and gases.

Fire.
Flash Point,°C
-18
Upper exp. limit, %
37.7
Lower exp. limit, %
3.3
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Strong oxidizer. Contact with combustible materials may cause a fire. Containers may explode in the heat of a fire. Reacts violently with water. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. Substance will react with water (some violently) releasing flammable, toxic, or corrosive gases and runoff. Extinguishing media: Do NOT use water directly on fire. If water is the only media available, use in flooding amounts. Use carbon dioxide or dry chemical. DO NOT USE WATER! Do NOT get water inside containers. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
No fumes in air. Nonflammable.
Hazards
Forms strong acids on contact with water.
Combustion products
Decomposes into irritating and toxic gases Although nonflammable, it may ignite other combustibles.
Health
4
 
Flammability
0
 
 
Reactivity
2
 
 
Special
OW

Health.
Poison_Class
2
Exposure effects
Prolonged or repeated inhalation may cause nosebleeds, nasal congestion, erosion of the teeth, perforation of the nasal septum, chest pain and bronchitis.
   Ingestion
May be fatal if swallowed. May cause severe and permanent damage to the digestive tract. May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns. May cause circulatory system failure. Causes effects similar to those of acute skin absorption.
   Inhalation
Harmful if inhaled. May cause severe irritation of the respiratory tract with sore throat, coughing, shortness of breath and delayed lung edema.
   Skin
Causes skin burns. Absorption through the skin may cause circulatory failure leading to kidney failure and liver and heart damage.
   Eyes
Causes severe eye burns. May cause irreversible eye injury.

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 not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. 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. Discard contaminated clothing in a manner which limits further exposure. SPEEDY ACTION IS CRITICAL! Destroy contaminated shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed.

Transport.
UN number
1754
Response guide
Hazard class
8
PRTC
T
Packing Group
I
 
USCG CHRIS Code
CSA
 
HS Code
2806 20 00
 
Std. Transport #
4930204
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
S/P