425478
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
NACRES:
NA.21
PubChem Substance ID:
UNSPSC Code:
12352300
EC Number:
231-197-3
MDL number:
Assay:
≥99%
vapor density
2.8 (vs air)
Quality Segment
vapor pressure
280 mmHg ( 25 °C)
assay
≥99%
contains
stabilizer
reaction suitability
reagent type: oxidant
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 (SO3) is an oxide of sulfur. It is released during the combustion of sulfur bearing fuels. Sulfur dioxide in the presence of vanadia catalyst oxidizes to form sulfur trioxide. The kinetics of this reaction has been studied. Density function theory and ab initio methods have been used to study the hydrolysis of SO3 to form sulfuric acid.
Application
Sulfur trioxide (SO3) may be used in the synthesis of methane sulfonic acid (MSA) by sulfonating methane.
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
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