Overview
High-concentration aqueous ammonia is a versatile chemical solution widely used in industrial and agricultural sectors. It consists of ammonia gas dissolved in water, typically at concentrations ranging from 25% to 30%. The solution is valued for its alkaline properties and reactivity, making it essential in fertilizers, cleaning products, and chemical manufacturing. Due to its volatility and corrosiveness, handling requires strict safety measures. The solution is often transported in sealed containers to prevent ammonia gas release. Its affordability and effectiveness ensure steady demand in B2B markets, particularly in regions with large-scale agriculture or chemical production.
Physical and Chemical Properties
High-concentration aqueous ammonia is a colorless liquid with a sharp, suffocating odor. Its density and boiling point vary with concentration; for example, a 25% solution has a density of ~0.91 g/cm³ and boils at 38°C. The solution is highly alkaline (pH ~11-12) and reacts exothermically with acids. Ammonia’s solubility in water decreases with rising temperature, requiring cool storage to minimize evaporation. It forms ammonium hydroxide (NH4OH) in water, though most ammonia remains as dissolved gas. This equilibrium makes the solution volatile, releasing ammonia vapor upon exposure to air. Its reactivity with metals like copper or zinc necessitates corrosion-resistant storage materials.
Main Applications
In agriculture, high-concentration aqueous ammonia is a key nitrogen source for fertilizers, either directly applied or processed into ammonium salts. It boosts crop yields by providing readily absorbable nitrogen. Industrial uses include pH adjustment in water treatment, where it neutralizes acidic wastewater. The chemical industry employs it as a precursor for urea, nitric acid, and synthetic fibers. Cleaning agents leverage its grease-cutting ability, particularly in glass or metal degreasing. Lesser-known applications include refrigeration (as a coolant) and pharmaceuticals (in synthesizing certain drugs). Its versatility ensures demand across diverse sectors.
Safety and Storage
High-concentration aqueous ammonia poses health risks, including respiratory irritation, burns, and eye damage. Workers must wear PPE (gloves, goggles, respirators) and ensure adequate ventilation. Spills require neutralization with weak acids (e.g., vinegar) and immediate containment. Storage mandates sealed, corrosion-resistant containers (e.g., polyethylene or rubber-lined steel) in cool, ventilated areas. Avoid proximity to acids or oxidizers to prevent hazardous reactions. Transport regulations often classify it as a hazardous material, requiring UN-certified packaging and hazard labels. Emergency eyewash stations and showers are critical in handling facilities.
B2B Procurement Guide
Buyers should prioritize suppliers with certifications like ISO 9001 or REACH compliance, ensuring product quality and regulatory adherence. Key procurement factors include concentration verification (via lab analysis), packaging integrity, and bulk pricing for large orders. Regional price fluctuations occur due to raw material (natural gas) costs and logistics. For reference, prices range from $200-$500 per ton. Long-term contracts may offer stability. Evaluate supplier reliability, delivery timelines, and safety documentation. For international shipments, confirm compliance with local regulations (e.g., TDG, ADR).
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