Sodium hypochlorite (NaOCl) CAS 7681-52-9: Properties & Applications B2B | Loc Thien

What is NaOCl/Bluze? Definition and industrial importance.

Unlike household bleach, which has a low concentration (usually <5%), industrial NaOCl is typically supplied at higher concentrations, mainly 10% or 12% (calculated as NaOCl or effective chlorine), to meet the demanding and efficient treatment needs in manufacturing processes.

General specifications of industrial sodium hypochlorite

Industrial NaOCl is characterized by clear technical indicators to ensure performance and safety in application. Below is a summary table of basic parameters for 10% and 12% sodium hypochlorite:

These parameters help businesses select the right type of NaOCl suitable for their production process, while ensuring compliance with safety and environmental regulations. Checking the COA and MSDS is a necessary step to verify the quality and consistency of the product across batches.

Physical and chemical properties and stability of Sodium Hypochlorite

Sodium hypochlorite is a compound with strong oxidizing properties, which determine its bleaching and disinfecting capabilities. Key properties include:

• Appearance and smell: NaOCl is a clear liquid, ranging in color from pale yellow to yellowish-green, with a characteristic strong chlorine odor. Its color may darken over time or upon exposure to light.
• Oxidizing properties: It acts as a powerful oxidizing agent. This allows it to break down the structure of organic compounds, bacteria, viruses, algae, and fungi, causing discoloration and destroying pathogens.
• PH: NaOCl solution is highly alkaline (pH > 11). This alkalinity helps stabilize the solution and prevent excessive decomposition.
• Stability: NaOCl is relatively unstable and easily decomposes over time, especially when exposed to high temperatures, sunlight, heavy metals, or acidic environments. This decomposition process releases chlorine gas and oxygen, producing sodium chloride (NaCl).
• Reaction with acids: The reaction is extremely dangerous when NaOCl is mixed with acid. This reaction produces toxic chlorine gas (Cl₂), which can cause serious respiratory damage and even death if inhaled at high concentrations.
• Reaction with ammonia: Similarly, mixing NaOCl with ammonia-containing compounds (such as toilet cleaners, ammonia) will produce toxic chloramines, which irritate the eyes, nose, throat, and lungs.

Due to its unstable nature and potential hazards, the storage of sodium hypochlorite must strictly adhere to safety rules to maintain its effectiveness and prevent accidents.

Comparison of 10% and 12% concentrations in industrial applications.

Industrial NaOCl is typically supplied in two main concentrations: 10% and 12%. While the difference is not significant, it can impact efficiency and cost in specific applications.

A brief comparison with Hydrogen Peroxide (H₂O₂):

Common industrial applications of NaOCl and Bleach

With its strong oxidizing and disinfecting properties, sodium hypochlorite is an indispensable chemical in many industries.

• Water and wastewater treatment: This is the biggest application of NaOCl. It is used to disinfect drinking water, eliminating bacteria, viruses, and other pathogens; oxidize organic and inorganic pollutants in wastewater; and control the growth of algae and moss in water supply systems and swimming pools.
• Bleaching in the textile and paper industries: In the textile industry, NaOCl is used to bleach fabric fibers, remove impurities, and brighten the color of the product. In paper manufacturing, it is used to bleach pulp, improving the whiteness and quality of the finished paper.
• Industrial and medical hygiene: NaOCl solution is used as a disinfectant for surfaces, floors, and equipment in factories, hospitals, restaurants, hotels, and other public facilities.
• Aquaculture: Used for disinfecting fish ponds, equipment, and water sources, killing pathogens, and controlling toxic algae, helping to create a clean and safe environment for livestock.
• Food and beverage industry: Used for cleaning food contact surfaces, processing and storage equipment, ensuring food safety and hygiene.

NaOCl is a cost-effective solution for many industrial disinfection and bleaching needs; however, its use must be strictly controlled to ensure safety and compliance with environmental regulations.

Safety precautions and storage instructions for Sodium Hypochlorite

NaOCl is a corrosive chemical and can be hazardous if not handled properly. Adherence to safety and storage guidelines is paramount:

• Personal protective equipment (PPE): Always wear chemical-resistant gloves, safety glasses, a face mask, and protective clothing when handling NaOCl. Avoid direct contact of the chemical with skin, eyes, and respiratory tract.
• Avoid mixing with other substances: NEVER mix NaOCl with acids (including weak acids like vinegar) or products containing ammonia. This combination produces toxic gases (chlorine or chloramines) that pose a serious health risk.
• Ventilation: Work in a well-ventilated area to avoid the buildup of chlorine fumes.
• Preservation:
  • Store NaOCl in its original, airtight, opaque container (as light degrades the chemical) in a cool, dry place, away from direct sunlight.
  • Low temperatures help extend shelf life. Avoid high temperatures as they will accelerate decomposition.
  • Keep away from flammable materials, acids, heavy metals, and other reducing agents.
  • Ensure the storage area has a drainage system or means to contain chemical spills.
• Spill handling: In case of spills, isolate the area, wear full PPE, and use absorbent materials to collect the spill. Do not pour bleach directly down drains without treatment.
• First aid: If NaOCl comes into contact with skin or eyes, rinse immediately with plenty of clean water for at least 15 minutes and seek medical attention. If inhaled, move the victim to fresh air and contact emergency services.

Strict adherence to these measures not only protects workers but also ensures the quality and effectiveness of NaOCl throughout its use.

Frequently Asked Questions about Sodium Hypochlorite and Bleach

Need high-quality industrial-grade NaOCl/Bleach (10-12%) with clear COA/MSDS? Please refer to our product catalog and contact us for pricing at:

→ Loc Thien Chemicals – NaOCl Javen 12%
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