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Merck
CN

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%
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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.

pictograms

CorrosionExclamation mark

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)
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
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
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
Mohammad Solimannejad et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 61(3), 373-375 (2004-12-08)
Ab initio computational study of the electronic structure and infrared spectra of donor-acceptor complexes formed between SO3 and CH3X (X = F, Cl, Br) molecules was carried out at the MP2(full)/6-31G(d) level of theory. The calculated complexation energy at G2MP2

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