Ethane is primarily used to make ethylene, the building block for most of the world’s plastics. While it looks like a simple, colorless gas at room temperature, ethane is one of the most economically important hydrocarbons on Earth because of what it becomes after industrial processing. It also has smaller roles as a refrigerant, a fuel component, and a calibration gas in laboratories.
Ethylene Production: Ethane’s Main Job
The overwhelming majority of ethane produced globally goes through a process called steam cracking, where it’s heated to extreme temperatures to break its molecular bonds and produce ethylene. In a steam cracking facility, about 90% of the ethane fed into the process is converted into ethylene. A newer alternative method called oxidative dehydrogenation operates at around 580°C and achieves roughly 81% conversion, though it’s still being optimized for commercial scale.
Ethylene is one of the most produced chemicals in the world, and nearly all of it traces back to ethane or other light hydrocarbons pulled from natural gas. The ethane itself comes primarily from natural gas processing plants, where it’s separated out from the methane that heats homes and powers generators.
Plastics and Packaging
Once ethane becomes ethylene, it’s transformed into polyethylene, the single most common plastic on the planet. Polyethylene comes in three main forms, each suited to different products:
- Low-density polyethylene (LDPE) is flexible and lightweight. It’s used for shopping bags, cling film, squeezable bottles, and cable coating.
- Linear low-density polyethylene (LLDPE) is similar but stronger. It shows up in stretch wrap, milk carton linings, and food packaging film.
- High-density polyethylene (HDPE) is rigid and durable. It’s molded into detergent bottles, water pipes, industrial drums, dustbins, and crates.
All three forms can also be injection-molded into everyday items like buckets, food storage containers, and washing-up bowls. If you look around your kitchen or garage, chances are most of the plastic you see started as ethane molecules extracted from natural gas.
Vinyl Chloride and Other Chemical Products
Beyond plastics, ethane serves as a starting material for several important industrial chemicals. One notable pathway converts ethane directly into 1,2-dichloroethane, a precursor to vinyl chloride. Vinyl chloride is the raw material for PVC, the rigid plastic used in pipes, window frames, flooring, and medical tubing. Newer catalytic processes can convert ethane to this intermediate compound with up to 90% selectivity, potentially bypassing the need to make ethylene first.
Ethane can also be a feedstock for producing ethyl chloride, which is used in manufacturing dyes, drugs, and as a mild topical anesthetic. The chemical versatility of ethane’s two-carbon structure makes it a useful starting point for building more complex molecules across the chemical industry.
Refrigeration at Extreme Temperatures
Ethane, designated R-170 in refrigeration terminology, works as a coolant in cascade refrigeration systems designed to reach extremely low temperatures. In these setups, ethane handles the low-stage cooling while a different refrigerant like propane (R-290) handles the high stage. This arrangement can push evaporator temperatures far below what conventional refrigerants achieve, making it useful for industrial processes that need ultra-cold conditions, such as liquefying gases or certain pharmaceutical manufacturing steps.
Ethane’s very low boiling point gives it an advantage over common refrigerants in these specialized applications, though its flammability limits its use to controlled industrial environments rather than household appliances.
Laboratory Calibration and Gas Analysis
In scientific and industrial settings, ethane is included in standardized gas mixtures used to calibrate analytical instruments. A typical calibration mix might contain ethane at 15 parts per million alongside methane, propane, and other hydrocarbons, all dissolved in nitrogen. These mixtures are used to verify the accuracy of gas chromatography equipment, test personal and fixed gas monitors, and validate industrial stack analyzers that measure emissions from factories and power plants.
Fuel Applications
Ethane is a combustible gas with a respectable energy content, and it’s sometimes burned as fuel, particularly in natural gas blends. In remote power generation along natural gas pipelines, hydrocarbon gases (including ethane as a component of the gas stream) are burned to maintain operating temperatures around 540°C in thermoelectric generators. These small power systems, typically producing between 20 and 1,000 watts, keep sensors and monitoring equipment running at remote pipeline locations far from the electrical grid.
That said, ethane is rarely burned as a standalone fuel. Its value as a chemical feedstock typically makes it more profitable to crack into ethylene than to simply combust for energy. This economic reality is why natural gas processors go to the trouble of separating ethane from methane in the first place.
Environmental Profile
Ethane has a global warming potential of about 10 over a 100-year time horizon, meaning one ton of ethane traps roughly 10 times more heat than one ton of carbon dioxide over that period. Its direct warming effect is actually less than 1, but it triggers indirect warming by influencing other atmospheric chemistry. Compared to methane, which has a global warming potential around 28 to 30, ethane is a less potent greenhouse gas. It breaks down in the atmosphere faster than CO₂ but still contributes to background ozone formation.
Storage and Safety Considerations
Ethane is stored as a compressed or liquefied gas and must be kept below 52°C (125°F). It’s highly flammable and can form explosive mixtures with air, so storage facilities require strict ventilation, leak detection, and ignition source controls. In industrial settings, ethane is typically handled in pressurized cylinders or transported through dedicated pipelines from natural gas processing plants directly to cracking facilities, minimizing the need for long-term storage.