Overview
Ethylene (C2H4) is the simplest alkene and one of the most important organic chemicals in industrial chemistry. As a plant hormone, it regulates fruit ripening and plant growth. In industrial applications, it serves as the primary building block for polyethylene and other polymers. First isolated in 1795, ethylene has become fundamental to modern petrochemical industries. Its global production exceeds 150 million tons annually, making it the organic compound with the highest production volume worldwide.
Physical and Chemical Properties
Ethylene is a colorless gas with a faint sweet odor at high concentrations. The molecule features a carbon-carbon double bond that makes it highly reactive in polymerization and addition reactions. It has lower density than air and is slightly soluble in water. Chemically, ethylene readily undergoes addition reactions, oxidation, and polymerization. Its double bond can be hydrogenated to ethane or oxidized to ethylene oxide. The gas forms explosive mixtures with air (2.7-36% by volume), requiring careful handling.
Main Applications
Over 60% of global ethylene production goes into polyethylene manufacturing. High-density polyethylene (HDPE) and low-density polyethylene (LDPE) are used for plastic containers, packaging films, and pipes. Ethylene serves as a precursor for ethylene glycol (antifreeze), styrene (polystyrene), and vinyl chloride (PVC). In agriculture, ethylene gas controls fruit ripening in storage facilities. Laboratories use ethylene as a reagent in organic synthesis and plant biology research. Minor applications include welding gas mixtures and anesthetic agents.
Safety and Storage
Ethylene requires strict safety measures due to its extreme flammability (Class 1A flammable gas). Storage areas must have explosion-proof electrical equipment and proper ventilation. Cylinders should be secured upright and protected from physical damage. Personal protective equipment (PPE) for handling includes flame-resistant clothing, safety goggles, and proper respirators in confined spaces. Leak detection requires combustible gas detectors rather than relying on odor, as ethylene concentrations below 0.1% are odorless.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 99.5-99.9% for most applications), delivery method (cylinders, pipeline, or bulk liquid), and required certifications. For laboratory use, reagent-grade ethylene in smaller cylinders is available. Consider supplier reliability, cylinder exchange programs, and emergency response capabilities. Many suppliers offer just-in-time delivery for large-volume users. Price negotiations often depend on contract duration and volume commitments.
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