Oleum

  • Oleum iodisum
  • Fuming sulfuric acid
  • Disulfuric acid
  • Sulfuric acid, mixture with sulfur trioxide
  • Pyrosulfuric acid
  • Dithionic acid
Formula
H2S2O7
Structure
Description
Off white to amber, viscous, fuming liquid. 5 - 70% sulfur trioxide. Physical properties are for 20% solution.
Uses
Chemical intermediate for linear alkylbenzene sulfonate surfactants, for dyes, chemical agent in petroleum refining, in nitration of explosives, in nitrocellulose mfr, in caprolactam mfr, drying agent for chlorine & nitric acid.

Registry Numbers and Inventories.
CAS
8014-95-7
EC Index Number
016-019-00-2
R 14 35 37
S 26 30 45
RTECS
WS5605000
RTECS class
Tumorigen
UN (DOT)
1831
Beilstein/Gmelin
27144 (G)
Swiss Giftliste 1
G-4563
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H2O7S2
Formula mass
178.14
Melting point, °C
1
Boiling point, °C
142
Vapor pressure, mmHg
2 (25 C)
Vapor density (air=1)
3.0
Evaporization number
<1 (butyl acetate=1)
Odor Threshold Odor threshold 1 mg/m3
Density
1.94 g/cm3 (20 C)
Solubility in water
Reacts violently
pKa/pKb
Strong acid

Hazards and Protection.
Storage
Store at ambient temperatures with venting open. Protect containers against physical damage and water. Store at away from carbides, chlorates, fulminates, nitrates, picrates, powdered metals, and combustible materials.
D1A E F C
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
Workers employed in mfr, handling or use of sulfuric acid should wear suitable personal protective equipment, including chem goggles, face screens, gloves, neoprene or PVC boots and acid-resistant trousers, legs of which should fall over boots. Protective clothing and safety apparatus needed for spill cleanup rubber gloves and boots, acid-resistant face shields and clothing, and a positive-pressure self-contained breathing apparatus.
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. Neutralize spilled material with crushed limestone, soda ash, or lime. Vapor knockdown water is corrosive or toxic and should be diked for containment. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash or cement powder. Neutralize with agricultural lime (CaO), crushed limestone (CaCO3) or sodium bicarbonate (NaHCO3). Water spill: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3).
Stability
Stable at normal temperatures and pressures but dangerously reactive.
Incompatibilities
Reacts as a strong acid, as an oxidizing agent and as a dehydrating agent May react explosively with acetic acid, acetic anhydride, acetonitrile, acrolein, acrylic acid, acrylonitrile, allyl alcohol, allyl chloride, ammonium hydroxide, aniline, cresol, butyraldehyde, cumene, ethyl acetate, ethylene diamine, ethylene glycol, glyoxal, isoprene, isopropyl alcohol, methyl ethyl ketone, propylene oxide, pyridine, styrene, vinyl acetate; strong bases (sodium hydroxide, potassium hydroxide) or mineral acids (nitric acid, hydrochloric acid, hydrofluoric acid) Reacts exothermically with sodium hypochlorite to produce chlorine gas.
Decomposition
Dangerous when heated to decomposition, emits highly toxic fumes of oxides of sulfur.

Fire.
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
Nonflammable but may ignite finely divided combustible materials on contact.
Hazards
Substance will react with water (some violently), releasing corrosiveand/or toxic gases.
Combustion products
Toxic and irritating vapors are generated.
Health
3
 
Flammability
0
 
 
Reactivity
2
 
 
Special
W

Health.
Poison_Class
1
Exposure effects
Sulfuric acid was teratogenic in one animal study.
   Ingestion
Ingestion of sulfuric acid can cause epigastric pain, nausea, and vomiting of mucoid and coffee ground material. Occasionally vomiting of fresh blood has been seen. Ingestion of concentrated sulfuric acid may produce esophageal corrosion, necrosis and perforation of the esophagus or stomach especially at the pylorus, and occasionally injury to the small bowel. Delayed complications may include strictures and fistula formation.
   Inhalation
Exposure to mist may cause irritation of the nose and throat with sneezing, sore throat or runny nose; non-specific effects such as headache, nausea and weakness. Gross overexposure may cause irritation of nose, throat, and lungs with cough, difficulty breathing or shortness of breath. Pulmonary edema (body fluid in the lungs) with cough, wheezing, abnormal lung sounds, possibly progressing to severe shortness of breath and bluish discoloration of the skin; symptoms may be delayed. Repeated and/or prolonged exposure to mists may cause corrosion of teeth.
   Skin
May cause skin corrosion, burns or ulcers.
   Eyes
Sulfuric acid vapor or mist is a strong irritant and can cause tearing and inflammation of the eye. Splash contact may cause corneal burns, visual loss and rarely perforation of the globe. The eye is especially sensitive to the corrosive effects. Irritation, tearing and inflammation of the eye develop with low concentrations. Splash contact with high concentrations causes corneal burns, visual loss and occasionally perforation of the globe.

First aid
 
   Ingestion
Have victim drink water or milk; do NOT induce vomiting.
   Inhalation
Administer oxygen. If respiratory symptoms develop obtain chest x-ray, monitor pulse oximetry and/or blood gases. Treat bronchospasm with inhaled beta agonists. If pulmonary edema develops, consider peep. Evaluate for esophageal, dermal and eye burns as indicated.
   Skin
Flush with plenty of water.
   Eyes
Flush with plenty of water for at least 15 min.; call a doctor.

Transport.
UN number
1831
Response guide
Hazard class
8
PRTC
T
Packing Group
I
 
USCG CHRIS Code
OLM
 
Std. Transport #
4930030 4930066
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
S/P