محلول سدیم هیدروکساید 46-50%

Sodium hydroxide solution (46–50%), often referred to as caustic soda or lye, is a highly concentrated aqueous solution of NaOH. It is a clear, colorless, and viscous liquid with strong alkalinity, typically used in industrial and laboratory settings.

🏭⚗️ Production
This concentrated solution is usually produced via the electrolytic chloralkali process, which generates sodium hydroxide alongside chlorine and hydrogen. After initial formation, the NaOH solution is evaporated to achieve the desired 46–50% concentration.

🔬 Properties
Sodium hydroxide solution at this concentration is a dense and viscous liquid with a density around 1.52 g/mL at room temperature. It has a boiling point near 135°C and a freezing (melting) point around 12 °C. The solution is extremely alkaline (pH ≈ 14). It absorbs moisture and carbon dioxide from the air, requiring airtight storage. Its viscosity is significantly higher than water—on the order of about 78 mPa·s—making it thick and slow-flowing.

🧪 Applications
• Industrial: Used widely in pulp and paper processing, soap and detergent production, alumina refining, and chemical manufacturing. Common in petroleum refining and textile processing as well.
• Laboratory: Serves as a strong base in titrations, pH adjustments, and chemical syntheses.
• Cleaning & Maintenance: Employed in heavy-duty cleaners and drain openers due to its ability to saponify grease and dissolve proteins.
• Water treatment: Utilized for pH control and water softening.
• Food processing (industrial scale): Used for peeling fruits and vegetables, chocolate/cocoa processing, and making lye-treated baked goods.