Overview
Chlorine is a halogen element that exists as a diatomic gas (Cl₂) under standard conditions. It was first isolated in 1774 by Carl Wilhelm Scheele and plays a critical role in modern industrial chemistry. Chlorine samples are typically obtained as compressed gas in specialized cylinders or as aqueous solutions. Industrial chlorine is produced primarily through the electrolysis of sodium chloride brine. The global chlorine market is driven by demand from water treatment facilities, chemical manufacturers, and PVC producers. As a sample, chlorine must be handled with extreme caution due to its high reactivity and toxicity.
Physical and Chemical Properties
Chlorine gas has a distinct yellow-green color and a pungent, irritating odor detectable at concentrations as low as 0.2 ppm. It is 2.5 times heavier than air, which causes it to accumulate in low-lying areas. The gas liquefies under pressure at room temperature, facilitating storage and transport. Chemically, chlorine is a powerful oxidizing agent that reacts with most elements and many organic compounds. It dissolves in water to form a mixture of hypochlorous acid (HOCl) and hydrochloric acid (HCl), which gives chlorine its disinfecting properties. Chlorine's reactivity makes it valuable for chemical synthesis but also necessitates careful handling to prevent hazardous reactions.
Main Applications
Approximately 65% of chlorine production is used in organic chemistry, primarily for PVC manufacturing through vinyl chloride monomer. In water treatment, chlorine effectively kills bacteria, viruses, and other pathogens, making it essential for safe drinking water and swimming pool sanitation. Other significant applications include pulp and paper bleaching, pharmaceutical intermediates, and production of inorganic chlorides. Chlorine compounds are also used in agricultural chemicals, refrigerants (historically), and as disinfectants in food processing. The versatility of chlorine makes it a foundational chemical for multiple industries.
Safety and Storage
Chlorine requires stringent safety measures due to its acute toxicity. Exposure to concentrations above 30 ppm can be immediately dangerous to life and health. Proper storage involves corrosion-resistant containers (typically steel) in well-ventilated areas, separated from ammonia, hydrocarbons, and other reactive substances. Personnel handling chlorine samples must wear appropriate PPE including chemical-resistant gloves, goggles, and respiratory protection. Facilities should have chlorine leak detection systems and emergency scrubbers. Transportation of chlorine cylinders follows strict regulations including proper labeling and segregation from incompatible materials.
B2B Procurement Guide
When procuring chlorine samples, buyers should verify supplier credentials including ISO certifications and compliance with regional chemical regulations. Request detailed product specifications including purity levels (typically 99.5-99.9% for industrial grade) and moisture content. Consider delivery methods - bulk liquid chlorine requires specialized tankers while cylinder gas is suitable for smaller quantities. Evaluate total cost including transportation, handling equipment, and safety infrastructure. Establish long-term supply agreements with reputable manufacturers to ensure consistent quality and pricing stability in this commodity chemical market.
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