Overview
Oxygen is a fundamental chemical element (atomic number 8) and the third-most abundant in the universe. As a diatomic molecule (O₂), it is critical for aerobic respiration in living organisms and industrial combustion processes. It was independently discovered by Carl Wilhelm Scheele and Joseph Priestley in the 18th century. In commerce, oxygen is supplied as a compressed gas, liquid, or in chemical compounds. Industrial production methods include cryogenic distillation of air and electrolysis of water, with the former being the dominant large-scale technique.
Physical and Chemical Properties
Oxygen gas is colorless, odorless, and tasteless under standard conditions. It exhibits paramagnetism due to unpaired electrons, a unique property among diatomic gases. The molecule has a bond length of 121 pm and dissociates into atomic oxygen at high temperatures (>2,500°C). Liquid oxygen (LOX) is pale blue and highly reactive, often used as an oxidizer in rocket propulsion. Oxygen dissolves sparingly in water, a feature vital for aquatic life. Its reactivity makes it form oxides with most elements except noble gases.
Main Applications
Medical oxygen therapy supports patients with respiratory conditions like COPD, typically at 90–95% purity. In metallurgy, oxygen enhances steelmaking efficiency through basic oxygen furnaces, reducing carbon content in iron. Environmental applications include wastewater treatment, where oxygen aeration breaks down pollutants. The aerospace sector relies on liquid oxygen as an oxidizer for rocket propellants. Emerging uses include oxygen-enriched combustion for cleaner energy production.
Safety and Storage
Though non-flammable, oxygen vigorously accelerates combustion. Leaks in oxygen-rich atmospheres can turn materials like clothing into fuel. Storage areas must be free of hydrocarbons, and cylinders should use dedicated regulators to prevent contamination. Liquid oxygen requires cryogenic containers with vacuum insulation to maintain temperatures below -183°C. Personnel handling LOX must wear protective gear to avoid frostbite. OSHA and NFPA provide guidelines for workplace oxygen safety.
B2B Procurement Guide
Buyers should specify purity levels: industrial grade (99.5%), medical grade (99.7%), or ultra-high purity (99.999%). Delivery options include bulk cryogenic tanks for large consumers or high-pressure cylinders for smaller needs. Suppliers must comply with ISO 20426 for medical oxygen or ASTM G93 for aerospace grades. Long-term contracts often include volume discounts. Evaluate logistics for cryogenic transport, which requires specialized tanker trucks.
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