227692
Sulfur trioxide
contains stabilizer, ≥99%
Synonym(s):
Sulfuric anhydride
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About This Item
Linear Formula:
SO3
CAS Number:
Molecular Weight:
80.06
UNSPSC Code:
12352300
PubChem Substance ID:
EC Number:
231-197-3
MDL number:
vapor density
2.8 (vs air)
vapor pressure
280 mmHg ( 25 °C)
assay
≥99%
form
liquid
contains
stabilizer
reaction suitability
reagent type: oxidant
impurities
low-melting solid polymer (the formation of which is unavoidable)
bp
44.7 °C (lit.)
mp
16.8 °C (lit.)
density
1.97 g/mL at 25 °C (lit.)
SMILES string
O=S(=O)=O
InChI
1S/O3S/c1-4(2)3
InChI key
AKEJUJNQAAGONA-UHFFFAOYSA-N
General description
Sulfur trioxide is an oxide of sulfur that is released during the combustion of sulfur bearing fuels. It can be prepared by the oxidation of sulfur dioxide in the presence of vanadia catalyst.
Application
Sulfur trioxide may be used in the synthesis of methane sulfonic acid (MSA) by sulfonating methane. it may also be used in the synthesis of fluorinated β-sultones by reacting with fluoroolefins.
signalword
Danger
hcodes
Hazard Classifications
Eye Dam. 1 - Skin Corr. 1A - STOT SE 3
target_organs
Respiratory system
supp_hazards
Storage Class
8B - Non-combustible corrosive hazardous materials
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Faceshields, Gloves, Goggles
Regulatory Information
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Related Content
Instructions
Emissions of sulfur trioxide from coal-fired power plants.
Srivastava RK, et al.
Journal of the Air & Waste Management Association (1995), 54(6), 750-762 (2004)
Fluorinated ?-Sultones.
Knunyants IL & Sokolski GA
Angewandte Chemie (International Edition in English), 11(7), 583-595 null
Direct sulfonation of methane to methanesulfonic acid by sulfur trioxide catalyzed by cerium (IV) sulfate in the presence of molecular oxygen.
Mukhopadhyay S and Bell AT
Advanced Synthesis & Catalysis, 346(8), 913-916 (2004)