Overview
Solid sodium hydroxide, commonly known as caustic soda, is a fundamental industrial chemical with the formula NaOH. It is produced via electrolysis of sodium chloride (chloralkali process) and is available as flakes, pellets, or granules. Its high reactivity and alkalinity make it indispensable in sectors ranging from chemicals to textiles. As a strong base, it readily reacts with acids, fats, and metals, releasing heat. Its hygroscopic nature requires careful handling to prevent clumping or dissolution. Industrial-grade NaOH typically has a purity of 98–99%, with trace impurities like sodium carbonate or chloride.
Physical and Chemical Properties
Solid NaOH appears as white, odorless crystals or pellets with a density of 2.13 g/cm³. It melts at 318°C and decomposes at higher temperatures, releasing toxic fumes. The exothermic dissolution in water produces a highly corrosive solution with a pH of 14. Its reactivity includes saponification (converting fats to soap), neutralization of acids, and degradation of organic materials. NaOH also reacts with aluminum, zinc, and other amphoteric metals, generating flammable hydrogen gas. These properties necessitate controlled storage and handling to avoid accidents.
Main Applications
In the chemical industry, NaOH is a precursor for compounds like sodium hypochlorite (bleach) and sodium aluminate. It is vital for pH adjustment in wastewater treatment and for scrubbing acidic gases in air pollution control. The pulp and paper industry relies on NaOH for delignification (kraft process), while food processing uses it for cleaning equipment or peeling fruits. Other uses include biodiesel production, textile processing (mercerization), and household drain cleaners (in diluted forms).
Safety and Storage
Solid NaOH poses severe health risks, including skin burns, eye damage, and respiratory irritation. Always use chemical-resistant gloves (e.g., nitrile), goggles, and ventilation. Store in sealed containers away from acids, moisture, and incompatible metals. Spills should be neutralized with vinegar or citric acid and rinsed with copious water. Facilities must have emergency showers and eyewash stations. Transportation requires UN1823-certified packaging and hazard labels for Class 8 corrosive substances.
B2B Procurement Guide
Buyers should prioritize suppliers with certifications like ISO 9001 and REACH compliance. Key specifications include assay (≥98%), chloride content (<0.1%), and iron concentration (<50 ppm). Packaging options include 25 kg bags or 1-ton super sacks with moisture barriers. Regional pricing fluctuates with energy costs (for production) and logistics. Bulk shipments (rail or sea) reduce costs but require proper storage infrastructure. Always audit suppliers for safety records and batch traceability.
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