Product Overview
Ethylene Oxide Gas is a highly versatile and reactive cyclic ether with the formula C₂H₄O. This colorless, flammable gas with a sweet, ether-like odor at high concentrations is one of the most important industrial chemical intermediates. Due to its strained three-membered ring structure, ethylene oxide gas is exceptionally reactive, enabling its use in the production of a vast array of downstream chemicals. It is also a potent sterilizing agent. The production, handling, and application of ethylene oxide gas require extreme caution due to its high flammability, toxicity, and carcinogenicity, making safety and precise engineering paramount.
Basic Information
| CAS No. | 75-21-8 |
| UN No. | UN1040 (Ethylene oxide, with nitrogen) - Typically stabilized and inhibited, often shipped under pressure as a liquid or dissolved in other solvents like carbon dioxide. |
| Molecular Formula | C₂H₄O |
| Hazard Classification | 2.3 (Toxic gas), 2.1 (Flammable gas) |
Key Attributes & Parameters
| Purity | Typically supplied at high purity (>99.5%) for chemical synthesis. Sterilization-grade ethylene oxide has stringent limits on impurities like aldehydes and moisture. |
| Physical State | Colorless gas at room temperature and pressure; it is a liquid below 10.7°C (51.3°F). It is miscible with water and most organic solvents. |
| Boiling Point | 10.7 °C (51.3 °F) |
| Flash Point | <-18 °C (<0 °F) (Gas) – Highly flammable over a wide range (3-100% in air). |
| Key Reactivity | Highly strained 3-membered epoxide ring, making it susceptible to ring-opening reactions with nucleophiles. |
Features & Advantages
Extremely Versatile Chemical Building Block
The high reactivity of the ethylene oxide ring allows it to add to compounds containing active hydrogen atoms (like -OH, -NH, -COOH), forming ethylene oxide derivatives. This is the foundation for producing ethylene glycols, ethoxylates, ethanolamines, and glycol ethers.
Powerful Low-Temperature Sterilant
Ethylene oxide gas is highly effective at killing all microorganisms, including bacteria, viruses, and spores, making it the sterilant of choice for heat- and moisture-sensitive medical devices and equipment.
High Purity for Critical Processes
Available in grades suitable for sensitive chemical syntheses and medical sterilization, where trace impurities can affect product quality or sterilizer performance.
Established Global Production & Supply
Manufactured on a massive scale via the direct oxidation of ethylene, supporting a vast downstream chemical industry.
Functional Characteristics
Ethylene oxide gas functions through its highly strained epoxide ring. In chemical synthesis, it undergoes exothermic ring-opening reactions, typically in the presence of catalysts or initiators, to add a -CH₂CH₂OH (hydroxyethyl) group to nucleophiles. This ethoxylation reaction is the basis for producing surfactants and polyols. In sterilization, ethylene oxide gas alkylates proteins and nucleic acids within microorganisms, disrupting cellular metabolism and reproduction, leading to death. It requires precise control of temperature, humidity, gas concentration, and exposure time. Due to its hazards, it is often handled as a liquid under pressure or in diluted mixtures.
Primary Application Fields
Chemical Manufacturing (Primary Use)
The largest volume use is as an intermediate to produce:
Ethylene Glycol: For antifreeze, polyester fibers (PET), and resins.
Surfactants & Detergents: Ethoxylated alcohols and alkylphenols.
Ethanolamines: For gas treatment, agrochemicals, and personal care.
Glycol Ethers: Solvents for paints, inks, and cleaners.
Medical Device Sterilization
Critical for sterilizing single-use medical devices like catheters, sutures, and surgical packs that cannot withstand steam sterilization.
Fumigation
Used to sterilize spices, certain foodstuffs, and archival materials.
Customer Collaboration Case
A global manufacturer of single-use polymer-based surgical kits faced a major challenge. Their primary ethylene oxide sterilization contractor was experiencing capacity constraints, risking supply delays for critical medical products. They needed to bring sterilization in-house but lacked the expertise to design and operate a safe, efficient, and compliant facility. We partnered with them as a total solution provider. We designed and supplied a turn-key ethylene oxide sterilization system, including the gas supply infrastructure, specialized chambers, and an advanced abatement system to safely destroy residual EO. Crucially, we implemented a dedicated, just-in-time supply chain for high-purity, medical-grade ethylene oxide gas, complete with real-time inventory monitoring and safety protocols. Our technical team provided extensive training on safe handling and process optimization. This partnership enabled the customer to achieve full operational control, reduce sterilization cycle times by 20%, and guarantee product availability for hospitals. The reliable supply and safe application of ethylene oxide gas were fundamental to ensuring the sterility of millions of life-saving medical devices annually.
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