Description

Chlorous Acid CAS NO 13898-47-0 is a reactive intermediate and a potent oxidizing agent, primarily known as the conjugate acid of chlorite. Its significance lies in its role as a key precursor in the synthesis of chlorine dioxide and other chlorite-based compounds, which are critical for industrial oxidation and disinfection processes. This chemical is essential for manufacturers and R&D facilities in the water treatment, pulp bleaching, and specialty chemical synthesis sectors.

Application

• Chemical Synthesis: A vital intermediate for producing chlorine dioxide (ClO₂), sodium chlorite, and other chlorite salts.
• Water Treatment: Serves as a precursor in on-site generation systems for chlorine dioxide, used for disinfection and controlling biofilms, taste, and odor.
• Pulp & Paper Industry: Involved in bleaching processes for wood pulp, where it contributes to efficient and selective delignification.
• Disinfectant & Biocide Production: Used in formulating advanced oxidative biocides for industrial cooling towers, food processing, and healthcare applications.
• Laboratory Research: Employed in studies of oxidation kinetics, reaction mechanisms, and the development of new catalytic systems.
• Specialty Oxidation Reactions: Applied in organic synthesis for selective oxidation steps where controlled reactivity is required.

Basic Information

Product Name	Chlorous Acid
CAS No.	13898-47-0
Molecular Formula	HClO₂
Molecular Weight	68.46 g/mol
Synonyms	Chlorous acid (HClO2); Chlorige Säure (German); Acide chloreux (French); Hydrogen chlorite; Chlorite acid; Chlorine(IV) acid; [ClO(OH)]
EINECS	237-633-4

Quality Control

Our Chlorous Acid is produced and handled under strict quality management protocols. While typically handled as an intermediate in solution, we ensure rigorous analytical control of precursor materials and reaction conditions. Certificates of Analysis (COA) detailing key parameters such as assay and impurity profiles are available for specific grades and formulations upon request, supporting your compliance and process validation needs.

Storage

Preserve in a tightly closed container, protected from light. Due to its nature as a strong acid/organic solvent and being easily oxidized (store under inert atmosphere), it must be stored in a cool, well-ventilated area away from incompatible materials such as reducing agents, strong bases, and organic matter. For specific stability data and recommended storage temperatures for formulated solutions, please contact our technical team.

Specification

Item	Specification
Appearance (Solution)	Colorless to pale yellow liquid
Identification (IR/Titration)	Conforms
Assay (as HClO₂)	Contact for details
Chloride (Cl⁻)	≤ Contact for details
Chlorate (ClO₃⁻)	≤ Contact for details
pH (of solution)	Contact for details

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