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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

Signal Word

Danger

Hazard Statements

H314,H335

Hazard Classifications

Skin Corr. 1A - STOT SE 3

Target Organs

Respiratory system

Supplementary Hazards

EUH014

Storage Class Code

8A - Combustible corrosive hazardous materials

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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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)
Luguang Chen et al.
Environmental science & technology, 47(3), 1729-1734 (2013-01-11)
Sulfur emission from a Victorian brown coal was quantitatively determined through controlled experiments in a continuously fed drop-tube furnace under three different atmospheres: pyrolysis, oxy-fuel combustion, and carbon dioxide gasification conditions. The species measured were H(2)S, SO(2), COS, CS(2), and
Huimin Qi et al.
International journal of biological macromolecules, 37(4), 195-199 (2005-11-29)
Polysaccharide extracted from Ulva pertusa (Chlorophyta) is a group of sulfated heteropolysaccharide; for simplicity, the sulfated polysaccharide is referred to as ulvan in this paper. In this study, different sulfate content ulvans were prepared with sulfur trioxide/N,N-dimethylformamide (SO3-DMF) in formamide
M Thanou et al.
Journal of controlled release : official journal of the Controlled Release Society, 117(2), 171-178 (2006-12-23)
Chitosan has been shown to act on the mucosal epithelial barriers mainly when protonated at acidic pH values in which it is soluble. Soluble chitosan is able to improve the permeation and absorption of neutral to cationic macromolecules only, as
Yan Cao et al.
Environmental science & technology, 44(9), 3429-3434 (2010-04-13)
The formation of sulfur trioxide (SO(3)) in coal-fired utility boilers can have negative effects on boiler performance and operation, such as fouling and corrosion of equipment, efficiency loss in the air preheater (APH), increase in stack opacity, and the formation
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