Description

Pyrosulfuric Acid, also known as oleum or fuming sulfuric acid, is a highly reactive and potent inorganic compound. It serves as a powerful sulfonating and dehydrating agent, essential for introducing sulfonic acid groups into organic molecules and for processes requiring extreme acidity. This chemical is critical for manufacturers in the petrochemical, pharmaceutical, and specialty chemical synthesis sectors, where it is used to produce dyes, detergents, and other sulfonated intermediates.

Application

• Sulfonation Agent: Key intermediate in the production of sulfonated compounds, including dyes, surfactants, and ion-exchange resins.
• Petrochemical Refining: Used in alkylation processes and as a catalyst for refining hydrocarbons.
• Chemical Synthesis: Acts as a powerful dehydrating and condensing agent in organic synthesis.
• Explosives Manufacturing: Employed in the production of certain nitro compounds and other energetic materials.
• Laboratory Reagent: Utilized in analytical chemistry and research for its strong acidic properties.
• Metal Processing: Used in pickling and etching of metals, particularly for surface treatment.

Basic Information

Product Name	Pyrosulfuric Acid
CAS No.	7783-05-3
Molecular Formula	H2S2O7
Molecular Weight	178.14 g/mol
Synonyms	Oleum; Disulfuric Acid; Fuming Sulfuric Acid; Nordhausen Acid; Pyrosulfuric Acid (H2S2O7); Sulfuric Acid, Fuming; Sulfuric Anhydride-Sulfuric Acid Mixture
EINECS	231-976-8

Quality Control

Our Pyrosulfuric Acid is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for concentration, purity, and impurity profiles. A comprehensive Certificate of Analysis (COA) is provided with every shipment, detailing key parameters such as assay (as H2S2O7), free SO3 content, and heavy metal limits. We adhere to relevant industry standards to guarantee consistent performance and reliability for your critical processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from incompatible materials such as organic compounds, strong bases, and metals. Due to its highly corrosive and fuming nature, containers must be kept upright and sealed to prevent moisture absorption and release of toxic fumes. Recommended storage temperature is between 15°C and 25°C.

Specification

Item	Specification
Appearance	Colorless to slightly yellow fuming liquid
Identification (IR)	Conforms
Assay (as H2S2O7)	Min. 40% (Typ. 65%)
Free SO3 Content	As per grade requirement
Iron (Fe)	Max. 10 ppm
Heavy Metals (as Pb)	Max. 5 ppm
Residue on Ignition	Max. 0.01%

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