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425478

Sigma-Aldrich

Sulfur trioxide

contains stabilizer, ≥99%

Synonym(s):

Sulfuric anhydride

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About This Item

Linear Formula:
SO3
CAS Number:
7446-11-9
Molecular Weight:
80.06
EC Number:
231-197-3
MDL number:
MFCD00011452
UNSPSC Code:
12352300
PubChem Substance ID:
24866637
NACRES:
NA.21

vapor density

2.8 (vs air)

Quality Level

100

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

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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.

pictograms

CorrosionExclamation mark
GHS05,GHS07

signalword

Danger

hcodes

H314,H335

Hazard Classifications

Skin Corr. 1A - STOT SE 3

target_organs

Respiratory system

supp_hazards

EUH014

Storage Class

8A - Combustible corrosive hazardous materials

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Faceshields, Gloves, Goggles

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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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
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
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
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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