Fluorosulfonic acid

  • Fluorosulfuric acid
  • Fluosulfonic acid
  • Monofluorosulfuric acid
Formula
HSFO3
Structure
Description
A fuming liquid.
Uses
Fluorinating agent, catalyst in alkylation, acylation, polymerization & condensation reactions, in hydrofluorination of olefins, in prodn of substituted pyridines, in prodn of petroleum products, prepn of magic acid.

Registry Numbers and Inventories.
CAS
7789-21-1
EC (EINECS/ELINCS)
232-149-4
EC Index Number
016-018-00-7
EC Class
Harmful; Corrosive
RTECS
LP0715000
RTECS class
Other
UN (DOT)
1777
Merck
12,4217
Beilstein/Gmelin
141551 (G)
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
FHO3S
Formula mass
100.06
Melting point, °C
-87.3
Boiling point, °C
163
Vapor pressure, mmHg
0.94 (25 C)
Vapor density (air=1)
3.5
Density
1.73 g/cm3 (20 C)
Solubility in water
Very soluble
Partition coefficient, pKow
-0.16
Heat of vaporization
44.3 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Use water spray to knock-down vapors. Do not use water on material itself. Neutralize spilled material with crushed limestone, soda ash, or lime.
Stability
Fumes in moist air; stable to 900 C.
Incompatibilities
Reacts exothermically with chemical bases (examples: amines, amides, and inorganic hydroxides) Reacts violently with water to generate hydrofluoric acid and sulfuric acid Reacts with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas Reacts with cyanide compounds to release gaseous hydrogen cyanide.
Decomposition
See fluosulfonates.When heated to decomposition, they emit highly toxic fumes of fluorides and oxides of sulfur.

Fire.
Flash Point,°C
-18
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
May burn but not ignite readily. May ignite combustibles (wood, paper, oil, clothing, etc.).
Hazards
Substance will react with water (some violently), releasing corrosiveand/or toxic gases.
Combustion products
Toxic and irritating fumes of hydrogen fluoride and sulfuric acid may form in fires.

Health.
Exposure effects
Hyperactive reflexes, painful muscle spasms, weakness and tetanic contractures may be noted due to fluoride induced hypocalcemia. Prenatal fluoride supplementation (2.2 mg NaF or 1 mg fluoride daily) during the last two trimesters of pregnancy has been reported to be safe.
   Ingestion
Epigastric pain, nausea, dysphagia, salivation, hematemesis, and diarrhea may be noted. These effects may be delayed for several hours following exposure. Gi symptoms are noted when 3 to 5 mg/kg of fluoride are ingested.
   Inhalation
Respirations are first stimulated then depressed. Death is usually from respiratory paralysis. Following inhalation, coughing and choking may be noted.
   Skin
Urticaria and pruritus have been reported following exposure to fluoride.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Remove victim to fresh air; if he is unconscious, give artificial respiration.
   Skin
Flush with water until medical help arrives; soak burned area in strong Epsom salt solution; pay particular attention to area around fingernails.
   Eyes
Flush with water until medical help arrives.

Transport.
UN number
1777
Response guide
Hazard class
8
PRTC
T
Packing Group
I
 
USCG CHRIS Code
FSA
 
Std. Transport #
4930010