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7446-11-9

7446-11-9 Structure

7446-11-9 Structure
IdentificationMore
[Name]

Sulfur trioxide
[CAS]

7446-11-9
[Synonyms]

SULFAN(R)
SULFURIC ANHYDRIDE
SULFUR TRIOXIDE
SULPHUR TRIOXIDE
SO3
Sulfan
Sulfur oxide (SO3)
Sulfur trioxide, stabilized
Sulfuric oxide
Sulfuricacidanhydride
sulfuricoxide
sulfurtrioxide,stabilized
Liquid Sulfur Trioxide
Sulfur trioxide, packaged in ampules, stabilized, 99%
Schwefeltrioxid
sulfur trioxide,inhibited
Sulfur trioxide,liquid
Oxosulfane dioxide
SULFUR TRIOXIDE, 99%, PACKAGED IN AMPULES, STABILIZED
Sulfur(VI) trioxide
[EINECS(EC#)]

231-197-3
[Molecular Formula]

O3S
[MDL Number]

MFCD00011452
[Molecular Weight]

80.06
[MOL File]

7446-11-9.mol
Chemical PropertiesBack Directory
[Appearance]

Needles or polymer
[Appearance]

Sulfur trioxide is a crystalline solid which has 3 forms: alpha-, beta-, and gamma-; and can also exist as a gas or liquid.
[mp ]

16.8 °C(lit.)
[bp ]

44.8 °C
[density ]

1.97 g/mL at 25 °C(lit.)
[vapor density ]

2.8 (vs air)
[vapor pressure ]

280 mm Hg ( 25 °C)
[storage temp. ]

Indoors
[Stability:]

Stable. Incompatible with organic materials, finely powdered metals, bases, water, cyanides and a wide variety of other chemicals. Reacts violently with water, oxygen and other chemicals-read a full data sheet before use.
[Water Solubility ]

reacts violently
[Merck ]

13,9069
[Uses]

Sulfonation of organic compounds, especially nonionic detergents, solar energy collectors. It is usually generated in the plant where it is to be used.
[CAS DataBase Reference]

7446-11-9(CAS DataBase Reference)
[NIST Chemistry Reference]

Sulfur trioxide(7446-11-9)
[EPA Substance Registry System]

7446-11-9(EPA Substance)
Safety DataBack Directory
[Hazard Codes ]

O,T+,C
[Risk Statements ]

R45:May cause cancer.
R8:Contact with combustible material may cause fire.
R14:Reacts violently with water.
R26:Very Toxic by inhalation.
R34:Causes burns.
[Safety Statements ]

S53:Avoid exposure-obtain special instruction before use .
S17:Keep away from combustible material .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S8:Keep container dry .
S25:Avoid contact with eyes .
[RIDADR ]

UN 1829 8/PG 1
[WGK Germany ]

1
[RTECS ]

WT4830000
[HazardClass ]

8
[PackingGroup ]

I
[Safety Profile]

Poison by inhalation. Human systemic effects by inhalation: cough and other pulmonary and olfactory changes. A corrosive irritant to skin, eyes, and mucous membranes. Violent reaction with O2F2, PbO, NClO2, HClO4, P, tetrafluorethylene, acetonitrile, sulfuric acid, dimethyl sulfoxide, dioxan, water, diphenylmercury, formamide, iodine, pyridine, metal oxides. Reacts with steam to form corrosive, toxic fumes of sulfuric acid. When heated to decomposition it emits toxic fumes of SO,. See also SULFURIC ACID.
[Hazardous Substances Data]

7446-11-9(Hazardous Substances Data)
Raw materials And Preparation ProductsBack Directory
【Raw materials】

Sulfuric acid-->Sulfur-->Oxygen-->Sulfur dioxide-->Sulphur-->PYRITE
【Preparation Products】

Sulfuric acid-->Thionyl chloride-->Dimethyl sulfate-->Phenol-->Chlorosulfonic acid-->Copper(I) chloride-->Resorcinol-->Metanilic acid-->Sulfamic acid-->Sodium dodecyl sulfate-->Sodium dodecylbenzenesulphonate-->Chromium(III) oxide-->CALCIUM DODECYLBENZENE SULFONATE-->5-[2-(METHYLTHIO)PYRIMIDIN-4-YL]THIOPHENE-2-SULFONYL CHLORIDE-->Sodium N-cyclohexylsulfamate-->4-Phenylphenol-->3-OXO-3-THIOPHEN-2-YL-PROPIONIC ACID ETHYL ESTER-->4-Morpholineethanesulfonic acid-->monoethanolamine dodecyl sulfate-->4-(2-Methoxyethyl)Phenol-->sec-alkyl sodium sulfate-->alkyl phenylsufonate-->stearyltoluene sodium sulfonate
Hazard InformationBack Directory
[General Description]

SULFUR TRIOXIDE(7446-11-9), is a colorless to white crystalline solid which will fume in air. Often shipped with inhibitor to prevent polymerization. SULFUR TRIOXIDE(7446-11-9) reacts violently with water to form sulfuric acid with the release of heat. SULFUR TRIOXIDE(7446-11-9) is corrosive to metals and tissue. SULFUR TRIOXIDE(7446-11-9) causes eye and skin burns. Ingestion causes severe burns of mouth esophagus and stomach. The vapor is very toxic by inhalation. SULFUR TRIOXIDE(7446-11-9) is a fire risk when in contact with organic materials such as wood, cotton, fiberboard, etc.
[Reactivity Profile]

The reaction of SULFUR TRIOXIDE and oxygen difluoride is very vigorous and explosions occur if the reaction is carried out in the absence of a solvent [J. Chem. Eng. Data 13(4):529-531. 1968]. The reaction of sulfur trioxide in excess with tetrafluoroethylene causes explosive decomposition to carbonyl fluoride and sulfur dioxide [Chem. Eng. News 49(22):3. 1971]. The reaction of anhydrous perchloric acid with sulfur trioxide is violent and accompanied by the evolution of considerable heat (Pascal 16:300 1931-34). Liquid sulfur trioxide reacts violently with nitryl chloride, even at 75° C. The reaction of sulfur trioxide and lead oxide causes white luminescence [Mellor 7:654 1946-47]. The combination of iodine, pyridine, sulfur trioxide, and formamide developed a gas over pressurization after several months. This is due to the slow formation of sulfuric acid, from external water or dehydration of the formamide to hydrogen cyanide.
[Air & Water Reactions]

Combines with water with explosive force, forming sulfuric acid due to its acidity Sulfur trioxide chars most organic substances. On exposure to air SULFUR TRIOXIDE absorbs moisture rapidly, emitting dense white fumes [Merck 11th ed. 1989].
[Health Hazard]

This material is highly toxic. It is an irritant and corrosive to mucous membranes. Poisonous if inhaled or swallowed. Contact causes severe burns to skin and eyes.
[Potential Exposure]

Sulfur trioxide is used as a sulfating and sulfonating agent for detergent, lubricating oil additives, and other organic compounds; in solar energy collectors. It is also used as an intermediate in sulfuric acid manufacture and in making explosives.
[Fire Hazard]

Fire risk in contact with organic materials. An explosive increase in vapor pressure occurs when the alpha form melts. Combines with water with explosive violence, forming sulfuric acid. May ignite other combustible materials (wood, paper, oil, etc.). Flammable poisonous gases may accumulate in tanks and hopper cars. Runoff to sewer may create fire or explosion hazard. Forms sulfuric acid on contact with water. Avoid water and organic materials. On exposure to air, SULFUR TRIOXIDE absorbs moisture and emits dense white fumes.
[First aid]

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 30 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. If victim is conscious, administer water, or milk. Do not induce vomiting. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.
[Shipping]

UN1829 Sulfur trioxide, stabilized, Hazard class: 8; Labels: 8-Corrosive material, 6.1-Poisonous Inhalation Hazard, Inhalation Hazard Zone B.
[Incompatibilities]

Combustible and Corrosive. A strong oxidizer. Reacts violently with water, steam or moisture, releasing corrosive hydrosulfuric acid. Violent reactions occur on contact with strong bases; strong acids, chemically active metals; reducing agents; finely divided metal; cyanides, nitrates, picrates, fulminates, chlorates, sulfides, carbides, phosphorus, dioxygen difluoride, barium oxide; lead oxide; diphenyl mercury; alcohols, nitryl chloride; acetonitrile, dioxane, tetrafluoroethylene.
[Waste Disposal]

Return refillable compressed gas cylinders to supplier. Nonrefillable cylinders should be disposed of in accordance with local, state and federal regulations. Allow remaining gas to vent slowly into atmosphere in an unconfined area or exhaust hood. Refillabletype cylinders should be returned to original supplier with any valve caps and outlet plugs secured and valve protection caps in place.
Material Safety Data Sheet(MSDS)Back Directory
[msds information]

Sulfuric anhydride(7446-11-9).msds
Well-known Reagent Company Product InformationBack Directory
[Acros Organics]

Sulfur trioxide, packaged in ampules, stabilized, 99%(7446-11-9)
[Sigma Aldrich]

7446-11-9(sigmaaldrich)
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