Description

Sulfur Trioxide CAS NO 7446-11-9 is a highly reactive and versatile inorganic compound, primarily recognized as a powerful sulfonating and dehydrating agent. Its reactivity is critical for synthesizing key industrial intermediates, most notably in the production of sulfuric acid. This essential chemical is a cornerstone for manufacturers in the chemical processing, petrochemical, and specialty chemical sectors who require a reliable and high-purity source for sulfonation reactions.

Application

• Sulfuric Acid Production: The primary and most significant industrial use, serving as the key intermediate in the contact process for manufacturing concentrated sulfuric acid.
• Organic Synthesis & Sulfonation: A vital reagent for introducing sulfonic acid groups into aromatic compounds, producing sulfonates used in detergents, dyes, and pharmaceuticals.
• Chemical Intermediate: Used in the synthesis of various chemicals, including chlorosulfonic acid, oleum, and other sulfur-containing compounds.
• Petroleum Refining: Employed in alkylation and other refining processes to modify hydrocarbon streams and improve fuel qualities.
• Laboratory Reagent: Utilized as a powerful dehydrating and sulfonating agent in research and analytical chemistry settings.

Basic Information

Product Name	Sulfur Trioxide
CAS No.	7446-11-9
Molecular Formula	SO3
Molecular Weight	80.06 g/mol
Synonyms	Sulfuric anhydride; Sulfur oxide (SO3); Sulfur(VI) oxide; Oleum (when dissolved in H2SO4); SO3; Sulfan; Sticky SO3; γ-SO3
EINECS	231-197-3

Quality Control

Our Sulfur Trioxide is produced and handled under stringent quality management protocols to ensure batch-to-batch consistency and high purity. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, purity, and controlled impurity levels. Our quality systems are designed to meet the rigorous demands of industrial chemical synthesis.

Storage

Preserve in a tightly closed, corrosion-resistant container, stored in a cool, dry, well-ventilated area specifically designated for strong oxidizers. It must be kept strictly separate from incompatible materials such as organic compounds, water, and strong bases. Due to its reactivity and tendency to polymerize, storage temperature should be controlled as per the specific grade and form (often requiring temperature stabilization to prevent solidification or pressure build-up).

Specification

Item	Specification
Appearance	Colorless liquid or solid (forms dependent on grade/temperature)
Assay (SO3)	≥ 99.5%
Iron (Fe)	≤ 10 ppm
Heavy Metals (as Pb)	≤ 5 ppm
Residue on Ignition	≤ 0.01%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.