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Merck

227692

Sigma-Aldrich

Sulfur trioxide

contains stabilizer, ≥99%

Sinónimos:

Sulfuric anhydride

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About This Item

Fórmula lineal:
SO3
Número de CAS:
Peso molecular:
80.06
EC Number:
MDL number:
UNSPSC Code:
12352300
PubChem Substance ID:

vapor density

2.8 (vs air)

vapor pressure

280 mmHg ( 25 °C)

assay

≥99%

form

liquid

contains

stabilizer

reaction suitability

reagent type: oxidant

impurities

low-melting solid polymer (the formation of which is unavoidable)

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 is an oxide of sulfur that is released during the combustion of sulfur bearing fuels. It can be prepared by the oxidation of sulfur dioxide in the presence of vanadia catalyst.

Application

Sulfur trioxide may be used in the synthesis of methane sulfonic acid (MSA) by sulfonating methane. it may also be used in the synthesis of fluorinated β-sultones by reacting with fluoroolefins.

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_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Faceshields, Gloves, Goggles


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  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  4. Is Product 227692, Sulfur trioxide, OK to use if it contains solids?

    This product may contain low-melting solid polymer, which is unavoidable. If the material is not completely liquid, place the bottle in a glass beaker or metal pail and warm under heat lamp or in an oven at 35°C. DO NOT OVERHEAT! This product boils at 44.7°C. Melting may take up to one week. When the material is liquid, it is ready for use.

  5. What is the stabilizer used in Product 227692, Sulfur trioxide?

    The manufacturer considers the identity of the stabilizer to be proprietary information.

  6. Why does Product 227692, Sulfur trioxide, contain a stabilizer?

    The stabilizer is present to facilitate melting, not to prevent polymerization.

  7. How is Product 227692, Sulfur trioxide, packaged?

    This product is packaged in a screw-capped glass bottle.

  8. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  9. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Emissions of sulfur trioxide from coal-fired power plants.
Srivastava RK, et al.
Journal of the Air & Waste Management Association (1995), 54(6), 750-762 (2004)
Fluorinated ?-Sultones.
Knunyants IL & Sokolski GA
Angewandte Chemie (International Edition in English), 11(7), 583-595 null
Direct sulfonation of methane to methanesulfonic acid by sulfur trioxide catalyzed by cerium (IV) sulfate in the presence of molecular oxygen.
Mukhopadhyay S and Bell AT
Advanced Synthesis & Catalysis, 346(8), 913-916 (2004)
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
R K Srivastava et al.
Journal of the Air & Waste Management Association (1995), 54(6), 750-762 (2004-07-10)
Emissions of sulfur trioxide (SO3) are a key component of plume opacity and acid deposition. Consequently, these emissions need to be low enough to not cause opacity violations and acid deposition. Generally, a small fraction of sulfur (S) in coal

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