Overview
Soda lime is a granular chemical mixture primarily composed of calcium hydroxide (Ca(OH)₂) and sodium hydroxide (NaOH), with minor additives like water and indicators. It is widely recognized for its ability to chemically absorb carbon dioxide (CO₂) and water vapor, making it indispensable in closed-circuit breathing systems. First developed in the early 20th century for medical anesthesia, soda lime's efficiency (1kg absorbs ~220L of CO₂) and cost-effectiveness have expanded its use to diving equipment and industrial scrubbers. Modern formulations often include pH-sensitive dyes (e.g., ethyl violet) that change color when exhausted.
Physical and Chemical Properties
Soda lime appears as hard, porous granules typically 2-5mm in diameter. The mixture is strongly alkaline (pH 12-13) due to its NaOH content and reacts exothermically with CO₂ to form calcium carbonate and water. This reaction is irreversible under standard conditions. Key technical parameters include a CO₂ absorption capacity of 20-25% by weight and a moisture content of 14-19% for optimal performance. The material gradually hardens ('channeling') during use, which reduces surface area and necessitates replacement. Industrial grades may contain silicates to improve structural stability.
Main Applications
In medical settings, soda lime is critical for anesthesia machines, where it prevents CO₂ buildup in rebreathing circuits. Modern hospitals use disposable canisters with 2-3kg of material, typically lasting 6-8 hours of continuous use. Diving rebreathers employ smaller quantities (0.5-1kg) for underwater breathing systems. Industrial applications include removing CO₂ from biogas and spacecraft life-support systems. Emerging uses involve laboratory gas purification and cannabis cultivation in controlled environments.
Safety and Storage
As a caustic material, soda lime requires PPE (gloves, goggles) during handling. Spent granules may contain residual NaOH and should be disposed of as hazardous waste. The exothermic reaction can generate temperatures up to 60°C in closed systems. Proper storage involves moisture-proof containers at 15-25°C. Shelf life is typically 2-3 years unopened, but indicators may fade sooner. Never mix with acids or organic compounds, as violent reactions may occur.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering certified medical-grade (ISO 7396-1) or industrial-grade (ASTM D4511) products. Key specifications to verify include: 1. Particle size distribution (85% within 2.5-4mm) 2. Dust content (<1% by weight) 3. CO₂ absorption rate (>100L/kg at 20°C) Bulk purchases (500kg+) commonly attract 15-20% discounts. Consider regional suppliers for reduced shipping costs, as soda lime is heavy (bulk density ~0.7g/cm³). Always request SDS and batch analysis certificates.
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