Sodium Hydroxide[10]
Overview
Low concentration sodium hydroxide (NaOH), often termed dilute caustic soda, is a widely used industrial alkali. Unlike its pure form (which is highly corrosive), diluted NaOH solutions (5-30%) are safer to handle while retaining key chemical properties. It is produced by dissolving solid NaOH in water or diluting higher-concentration solutions. This chemical is pivotal in industries requiring controlled alkalinity, such as food processing (e.g., olive curing) and textile manufacturing (fiber treatment). Its lower concentration reduces handling risks, making it preferable for applications where extreme pH isn’t necessary.
Physical and Chemical Properties
Low concentration NaOH solutions are colorless, odorless liquids with a slippery feel due to saponification. Their density and viscosity vary with concentration; a 10% solution has ~1.1 g/cm³ density. The pH typically ranges from 12-14, depending on dilution. Despite being less aggressive than pure NaOH, these solutions remain strongly alkaline and react exothermically with acids. They absorb CO₂ from air, forming sodium carbonate over time. Unlike solid NaOH, diluted solutions don’t pose significant hygroscopic risks but should still be stored sealed to prevent evaporation or contamination.
Main Applications
In water treatment, dilute NaOH adjusts pH and removes heavy metals via precipitation. Food industries use it to clean equipment or process items like pretzels (surface gelatinization). Textile manufacturers apply it to mercerize cotton, enhancing fabric strength and dye uptake. Other uses include soap production (saponification of fats at milder concentrations), paper pulping, and biodiesel refining. Its role in neutralization processes (e.g., acidic wastewater treatment) is cost-effective due to lower transportation and handling expenses compared to concentrated forms.
Safety and Storage
Though less hazardous than pure NaOH, dilute solutions can still cause burns or eye damage. PPE (nitrile gloves, splash goggles) is mandatory. Spills should be contained with inert absorbents and neutralized with vinegar or citric acid. Storage requires plastic (HDPE) or rubber-lined tanks to prevent corrosion. Avoid aluminum and galvanized steel. Solutions should be kept in cool, ventilated areas away from acids. Shelf life is indefinite if sealed, but concentration may shift due to evaporation or CO₂ absorption.
B2B Procurement Guide
Buyers should specify concentration (e.g., 10%, 20%) and purity (industrial or food grade). Bulk shipments (IBC totes, tanker trucks) reduce costs for large-scale users. Key certifications include ISO 9001 and REACH compliance. Regional suppliers are preferable to minimize logistics expenses. Pricing fluctuates with energy costs (NaOH production is energy-intensive). Sample testing is recommended to verify consistency. Contracts often include clauses for concentration tolerances (±2%).
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