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Sodium Chlorate is an inorganic compound commonly used in herbicides, chemical oxygen generation, and as an oxidizing agent in various industrial processes.
CAS No: 7775-09-9
Synonyms:
Chloric acid, sodium salt,Sodium chlorate(V),NaClO₃,Sodium salt of chloric acid,Chlorate of soda
Introduction
Definition and OverviewSodium chlorate (NaClO3) is an inorganic compound primarily recognized for its strong oxidizing properties.
It is a white crystalline powder that is highly soluble in water and decomposes upon heating to release oxygen.
This property makes it valuable in industrial applications, notably in bleaching and herbicide formulations.
Historical BackgroundThe discovery of sodium chlorate dates back to the early 19th century, coinciding with the development of electrochemical technologies.
Initially synthesized through chemical oxidation methods, the production of sodium chlorate rapidly advanced with the advent of electrolytic techniques, which remain the cornerstone of modern manufacturing processes.
Industrial SignificanceSodium chlorate is a crucial chemical in various sectors, particularly the pulp and paper industry, where it is used to produce chlorine dioxide for environmentally friendly bleaching.
Its potent oxidative nature also makes it suitable for herbicides, explosives, and laboratory reagents.
Chemical and Physical Properties
Molecular Characteristics
Molecular formula: NaClO3
Molar mass: 106.44 g/mol
Appearance: White crystalline powder
Odor: Odorless
CrystallographySodium chlorate crystallizes in a cubic system with high symmetry.
Its crystal structure comprises Na+ and ClO3- ions arranged in a stable, repeating lattice, contributing to its high solubility.
Solubility and pHSodium chlorate is highly soluble in water, with solubility increasing significantly at higher temperatures. Aqueous solutions are neutral to slightly alkaline, typically exhibiting a pH around 6.5–8.0.
Thermal Stability
Melting point: 248 °C (decomposes)
Boiling point: Decomposes before boiling
Applications and Uses
Pulp and Paper IndustrySodium chlorate is predominantly used to produce chlorine dioxide (ClO2), a selective bleaching agent that minimizes the formation of toxic chlorinated compounds in paper manufacturing.
Agricultural UseAs a non-selective herbicide, sodium chlorate disrupts photosynthesis by releasing reactive oxygen species.
It is used for weed control in non-crop areas and defoliation prior to harvest.
Explosives and PyrotechnicsDue to its high oxygen content, sodium chlorate serves as an oxidizer in pyrotechnic formulations and certain military explosives.
Chemical SynthesisIt acts as an oxidizing agent in organic and inorganic synthesis, facilitating reactions that require a reliable source of oxygen.
Other Applications
Laboratory reagent
Disinfectant in water treatment
Oxygen supply in closed environments (e.g., submarines)
Mechanism of Action
Oxidizing NatureThe chlorate ion (ClO3-) is a strong oxidizer.
It accepts electrons from other substances during redox reactions, often resulting in the evolution of oxygen.
ReactivitySodium chlorate reacts vigorously with organic materials, sulfur, phosphorus, and finely divided metals, especially under heat or friction, leading to combustion or explosion.
Thermal Decomposition
Stepwise breakdown leads to the formation of ClO2, Cl2, O2 depending on the conditions.
Catalyzed decomposition may proceed at lower temperatures.
Alternatives and Substitutes
Other Oxidizing Agents
Hydrogen peroxide
Potassium permanganate
Sodium hypochlorite
Green Chemistry Approaches
Use of biological oxidants or enzymatic methods
Comparative AnalysisWhile sodium chlorate is cost-effective and powerful, newer alternatives offer better biodegradability and reduced toxicity.
Regulations and Standards
Occupational Exposure Limits
OSHA: Not specifically regulated; general oxidizer guidelines apply
ACGIH: TLV not established
Transport Regulations
UN Number: 1495
Packaging Group: II or III depending on quantity
Labeling and Classification
GHS: Oxidizing solid, Acute toxicity category 4
Requires hazard pictograms and risk statements
Recent Research and Innovations
Production Efficiency Improvements
Membrane electrolyzers to reduce energy consumption
Catalyst development for selective oxidation
Environmental Applications
Used in advanced oxidation processes (AOPs) for wastewater treatment
Energy Storage
Research into chlorate-based flow batteries
Nanomaterial Interactions
Studies on reactivity with carbon nanostructures for controlled oxygen release
Conclusion
Sodium chlorate remains a vital industrial chemical with diverse applications, notably as an oxidizer in the pulp and paper industry and herbicidal formulations.
Its chemical properties, particularly its high oxidative potential, make it indispensable in various chemical processes.
However, its toxicity and environmental impact necessitate careful handling, regulation, and the exploration of safer alternatives.
Continued research into green production methods and alternative oxidants is essential for sustainable industrial practice.
SAFETY INFORMATION ABOUT SODIUM CHLORATE
First aid measures:
Description of first aid measures:
General advice:
Consult a physician.
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately.
Wash off with soap and plenty of water.
Consult a physician.
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
If swallowed:
Do NOT induce vomiting.
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Consult a physician.
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment.
Avoid breathing vapours, mist or gas.
Evacuate personnel to safe areas.
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste.
Keep in suitable, closed containers for disposal.
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles.
Faceshield (8-inch minimum).
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection:
Handle with gloves.
Gloves must be inspected prior to use.
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product.
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
Wash and dry hands.
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls.
If the respirator is the sole means of protection, use a full-face supplied air respirator.
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions.
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company.
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product
