Description

Sulfurous Acid CAS NO 15181-46-1 is a chemical intermediate formed when sulfur dioxide dissolves in water, representing a crucial source of the sulfite ion. This compound is essential for its powerful reducing and bleaching properties, making it a versatile reagent in numerous industrial processes. It is a key material for manufacturers in the chemical synthesis, water treatment, and pulp & paper industries, where precise control over its reactivity is required.

Application

• Chemical Synthesis: Acts as a key reducing agent and sulfonating agent in the production of various organic chemicals, pharmaceuticals, and dyes.
• Water Treatment: Used as a dechlorinating agent to remove excess chlorine and chloramines from municipal and industrial wastewater.
• Pulp & Paper Industry: Employed in the bleaching process for wood pulp to achieve high brightness levels in paper products.
• Food & Beverage Processing: Serves as a preservative and antioxidant (E220) in dried fruits, wine, and other products to prevent spoilage and browning.
• Textile Manufacturing: Utilized as a bleaching agent for delicate textiles like wool and silk.
• Metal Surface Treatment: Applied in pickling and cleaning solutions to remove oxides and scale from metal surfaces.
• Agricultural Chemistry: Used in the formulation of certain fungicides and pesticides.
• Laboratory Reagent: Serves as a standard analytical reagent in titrations and qualitative analysis.

Basic Information

Product Name	Sulfurous Acid
CAS No.	15181-46-1
Molecular Formula	H2SO3
Molecular Weight	82.07 g/mol
Synonyms	Sulfurous Acid; Sulfur Dioxide Solution; Sulphurous Acid; Dihydrogen Sulfite; Sulfurous Acid (aqueous); Sulfur(IV) Oxide Hydrate; SO2 Solution; E220 (food grade)
EINECS	239-266-5

Quality Control

Our Sulfurous Acid is manufactured under strict quality control protocols to ensure batch-to-batch consistency and reliability. We adhere to relevant industry standards, and the product quality is verified through comprehensive analytical testing. A Certificate of Analysis (COA) detailing key parameters such as assay, sulfur dioxide content, and impurity profiles is provided with each shipment to guarantee compliance with your specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and incompatible materials such as strong bases, oxidizing agents, and metals. Due to its nature as a strong acid/organic solvent, containers must be kept upright to prevent leakage and corrosion. Recommended storage temperature is between 15°C and 25°C.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (as SO2)	≥ 6.0 % (w/w)
Purity (HPLC)	Contact for details
Chloride (Cl)	≤ 0.005 %
Sulfate (SO4)	≤ 0.02 %
Heavy Metals (as Pb)	≤ 10 ppm
Residue on Ignition	≤ 0.05 %

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