Ethylene: Emissions
Can electric furnaces clean up cracking?
What this tab covers The greenhouse-gas footprint per tonne, split by lifecycle phase (feedstock, production, movement, use, end of life), the global total, other environmental impacts, levers and low-carbon routes, India's position, and where the investment opportunity lies. Emission intensity 1.60 t CO2e per t range 1.0-2.5 for cracking (ethane low, naphtha high); about 5-7 for coal-to-olefins · cradle-to-gate, global average, mass allocation across cracker co-products Global emissions per year 300 Mt CO2e per year 2024 · about 1.6 t x about 185 Mt (indicative)Per t of ethylene, cradle-to-gate. Intensity: Chemistry World 2024 (1.5-2 t CO2 per t from cracking); indicative (basis: IEA 2018, Plastics Europe eco-profiles). Global total: derived (indicative).
Share of footprint by lifecycle phase
Feedstock 30% Production / process 67% Movement 3%Footprint by lifecycle phase
| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| Feedstock | about 0.4-0.6 t CO2e per t | 30% | Methane leakage and flaring in oil and gas production, refinery energy for naphtha | Higher for coal-based feed | indicative (basis: Plastics Europe eco-profiles) |
| Production / process | about 1.0-1.1 t CO2 per t | 67% | Fuel burned in cracking furnaces (about 90% of site emissions), compressor drives | More than 30 GJ per t ethylene | Chemistry World 2024; indicative |
| Movement | about 0.05 t CO2e per t | 3% | Pipeline compression and refrigerated shipping | Most ethylene is used on site | indicative |
| Use | not applicable | – | Ethylene is converted into polymers; carbon stays in products | Fugitive and flare losses at derivative plants | n/a |
| End of life | about 3.1 t CO2 per t if PE products are incinerated | – | Fate of PE and other derivatives | Landfill stores carbon; incineration releases it; recycling rates for PE are low | stoichiometric (PE is 86% carbon) |
Other environmental impacts
Flaring and benzene/VOC emissions at fenceline; plastic leakage from downstream polyethylene; large cooling water use.
Levers to cut emissions
- Electric cracking furnaces: BASF, SABIC and Linde's 6 MW demonstrator at Ludwigshafen (2024) targets up to 90% lower CO2 on renewable power.
- Switching naphtha to ethane cuts cracker CO2 by roughly a third per t ethylene (indicative).
- Burning hydrogen-rich off-gas or using carbon capture on furnace flue gas.
- Efficiency upgrades and heat integration (5-15%, indicative).
- Bio-ethylene or pyrolysis-oil feed under mass balance certification.
India
India's crackers are mostly naphtha or dual-feed with fossil-fuel furnaces; no electric cracking projects are announced. Reliance has stated a net-zero target for 2035 that covers its petrochemical operations (company disclosures, indicative).
Emission figures are indicative global averages from the life-cycle studies named; actual footprints vary widely by site, energy mix and method.Low-carbon routes
| Route | Intensity | Cost premium | Status | Source |
|---|---|---|---|---|
| Electrically heated steam cracking | up to 90% lower process CO2 with renewable power | depends on power price; about 4-5 MWh of power per t ethylene would be needed (indicative) | BASF/SABIC/Linde demonstrator, 4 t/h feed, Ludwigshafen, started April 2024; Linde marketing as STARBRIDGE | Chemistry World 2024; Linde press release Apr 2024 |
| Bio-ethylene from sugarcane ethanol | negative to low cradle-to-gate (biogenic carbon credit) | about 30-50% (indicative) | Braskem, Brazil, about 260 kt/yr (indicative) | indicative |
| Cracker with carbon capture | about 50-70% lower process CO2 (indicative) | not published | Dow Path2Zero (Alberta) net-zero Scope 1 and 2 cracker, delayed to late 2029 | Argus Mar 2026 |