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%
InChI key
AKEJUJNQAAGONA-UHFFFAOYSA-N
InChI
1S/O3S/c1-4(2)3
SMILES string
O=S(=O)=O
vapor density
2.8 (vs air)
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.)
Quality Level
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
Regulatory Information
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Hydrolysis of sulfur trioxide to form sulfuric acid in small water clusters.
Larson LJ, et al.
J. Chem. Phys. , 112(20), 8830-8838 (2000)
Cheri L Stowell et al.
Chemistry & biology, 13(8), 891-897 (2006-08-26)
Bisphenol A (BPA) is a widely used plasticizer whose estrogenic properties may impact hormone-responsive disorders and fetal development. In vivo, BPA appears to have greater activity than is suggested by its estrogen receptor (ER) binding affinity. This may be a
T Kapias et al.
Journal of hazardous materials, 67(1), 9-40 (1999-05-20)
A new model describing the dispersion behaviour and the processes that occur in a cloud generated from accidental spills of SO3 and oleum has been developed. Such a cloud may initially behave as a dense gas, with several chemical and
Wei Liu et al.
Journal of agricultural and food chemistry, 58(1), 172-179 (2009-12-17)
The sulfation of psyllium was carried out with sulfur trioxide-pyridine in dimethyl formamide. Three sulfated psyllium derivatives, named SP1, SP2, and SP3, were characterized by sulfur content determination, elemental analysis, FT-IR, and surface charge analysis. The sulfated derivatives were also
Oxidation of sulfur dioxide to sulfur trioxide over supported vanadia catalysts.
Dunn JP, et al.
Applied Catalysis. B, Environmental, 19(2), 103-117 (1998)
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