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295698

Sigma-Aldrich

Sulfur dioxide

≥99.9%

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Synonym(s):
Sulfurous anhydride, Sulfurous oxide, Sulphur dioxide
Linear Formula:
SO2
CAS Number:
Molecular Weight:
64.06
Beilstein/REAXYS Number:
3535237
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.22

vapor density

2.26 (21 °C, vs air)

Quality Level

vapor pressure

1779 mmHg ( 21 °C)

assay

≥99.9%

bp

−10 °C (lit.)

mp

−73 °C (lit.)

density

1.25 g/mL at 25 °C (lit.)

SMILES string

O=S=O

InChI

1S/O2S/c1-3-2

InChI key

RAHZWNYVWXNFOC-UHFFFAOYSA-N

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1 of 4

This Item
296309247626AX0080
Sulfur dioxide ≥99.9%

295698

Sulfur dioxide

-
1,4-Dioxane anhydrous, 99.8%, contains <=25 ppm BHT as stabilizer

296309

1,4-Dioxane

-
Sulfur dioxide solution ACS reagent, ≥6%

247626

Sulfur dioxide solution

Essential Grade
Acetic Anhydride Meets ACS Specifications, Meets Reagent Specifications for testing USP/NF monographs GR ACS

AX0080

Acetic Anhydride

-
density

1.25 g/mL at 25 °C (lit.)

density

1.034 g/mL at 25 °C (lit.)

density

1.03 g/mL at 25 °C (lit.)

density

-

bp

−10 °C (lit.)

bp

100-102 °C (lit.)

bp

-

bp

-

mp

−73 °C (lit.)

mp

10-12 °C (lit.)

mp

-

mp

-73 °C

vapor density

2.26 (21 °C, vs air)

vapor density

3 (vs air)

vapor density

2.3 (vs air)

vapor density

-

vapor pressure

1779 mmHg ( 21 °C)

vapor pressure

27 mmHg ( 20 °C), 40 mmHg ( 25 °C)

vapor pressure

-

vapor pressure

4 hPa ( 20 °C)

Application

Sulfur dioxide is primarily used as a feedstock for the production of sulfuric acid (contact process). It is generally used in the synthesis of a variety of sulfur-containing organic compounds like alkyl/aryl sulfonyl chlorides, sulfinates, sultines, and polysulfone.

Packaging

Supplied in a carbon steel lecture bottle with a CGA180M/CGA110F needle valve installed.

Compatible with the following:
  • Aldrich® lecture-bottle station systems
  • Aldrich® lecture-bottle gas regulators

Other Notes

Legal Information

Aldrich is a registered trademark of Sigma-Aldrich Co. LLC

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Danger

Hazard Classifications

Acute Tox. 3 Inhalation - Eye Dam. 1 - Press. Gas Liquefied gas - Skin Corr. 1B

Storage Class

2A - Gases

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Faceshields, Gloves, Goggles, multi-purpose combination respirator cartridge (US)


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Sulfur dioxide
Understanding Wine Chemistry, 4(7), 140-148 (2016)
The development and application of sulfur dioxide surrogates in synthetic organic chemistry.
Emmett EJ and Willis MC
Asian Journal of Organic Chemistry, 4(7), 602-611 (2015)
Sulfur dioxide.
Ullmann's Encyclopedia of Industrial Chemistry (2000)
Eliza Harris et al.
Science (New York, N.Y.), 340(6133), 727-730 (2013-05-11)
Global sulfate production plays a key role in aerosol radiative forcing; more than half of this production occurs in clouds. We found that sulfur dioxide oxidation catalyzed by natural transition metal ions is the dominant in-cloud oxidation pathway. The pathway
Yuan-Qiang Sun et al.
Chemical communications (Cambridge, England), 49(26), 2637-2639 (2013-02-26)
A coumarin-hemicyanine dye was reported for ratiometric fluorescent detection of SO2 derivatives HSO3(-) and SO3(2-) based on a novel addition-rearrangement cascade reaction.

Protocols

Separation of Sulfur dioxide; Hydrogen sulfide; Carbonyl sulfide; Methanethiol; Ethanethiol; Dimethyl disulfide; Carbon disulfide

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