Basic information
- Name:
Sulfur trioxide
- CAS No.:
7446-11-9
- Molecular Structure:
- Formula:
- SO3
- Molecular Weight:
- 80.06
- Deleted CAS:
- 856577-62-3
- Synonyms:
- Sulfuroxide (SO3);Sulfuric anhydride;
- EINECS:
- 231-197-3
- Density:
- 2.27 g/cm3
- Melting Point:
- 16.8 °C(lit.)
- Boiling Point:
- 44.8 °C at 760 mmHg
- Solubility:
- reacts violently with water
- Appearance:
- Needles or polymer
- Hazard Symbols:
O,
T+,
C- Risk Codes:
- 45-8-14-26-34
- Safety Description:
- 53-17-26-36/37/39-45-8-25 Details
- Transport Information:
- UN 1829 8/PG 1
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Chemistry
IUPAC name:Sulfur trioxide
Other names:Sulfuric anhydride;Sulfan
EINECS: 231-197-3
Merck:13,9069
Melting point :16.9 °C
Boiling point :45 °C
vapor density :2.8 (vs air)
vapor pressure:280 mm Hg ( 25 °C)
storage temp.: Indoors
Sulfur trioxide(7446-11-9) is the chemical compound with the formula SO3. Its molar mass is 80.06 g/mol. Its liquid density is 1.92 g/cm3.
The Structure of Sulfur trioxide(7446-11-9):
Uses
Liquid sulfur trioxide((7446-11-9)) is used for sulfonation, especially in the manufacture of detergents. In the past, the difficulty was the instability of the sulfur trioxide. However, under the trade name Sulfans, stabilized forms of sulfur trioxide are available; several patented inhibitors such as boron compounds, methane sulfonyl chloride, sulfur, tellurium, and phosphorus oxychloride inhibit crystallization or conversion to a polymer.
Production
Sulfur trioxide(7446-11-9) is a pungent gas that is produced by the oxidation of sulfur dioxide or the complete combustion of sulfur with oxygen. It is also manufactured by distillation of strong oleum (H2SO4.SO3).
Toxicity Data With Reference
| 1. | ihl-hmn TCLo:30 mg/m3:NOSE,PUL | JPBAA7 Journal of Pathology and Bacteriology. 68 (1954),197. | ||
| 2. | ihl-gpg LCLo:30 mg/m3/6H | JPBAA7 Journal of Pathology and Bacteriology. 68 (1954),197. |
Consensus Reports
EPA Extremely Hazardous Substances List.SULFUR TRIOXIDE is reported in EPA TSCA Inventory.
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 SOx. See also SULFURIC ACID.
Standards and Recommendations
DOT Classification: 8; Label: Corrosive, Poison