Styrene: Emissions
Most of the footprint arrives with the feedstock
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 2.80 t CO2e per t range 2.3-3.5 · indicative (basis: 0.79 t benzene x 1.86 + 0.28 t ethylene x 1.44 from Plastics Europe values, plus about 0.9 t CO2e per t for dehydrogenation steam and power) Global emissions per year 98.0 Mt CO2e per year 2024 · 2.8 t CO2e/t x 35 Mt (indicative)Per t of styrene, cradle-to-gate. Intensity: derived from Plastics Europe Public LCI Database via Climatiq; indicative. Global total: derived.
Share of footprint by lifecycle phase
Feedstock 66% Production / process 31% Movement 3%Footprint by lifecycle phase
| Phase | Intensity | Share | Main sources of emissions | Notes | Source |
|---|---|---|---|---|---|
| Feedstock | about 1.87 t CO2e per t (benzene and ethylene) | 66% | Upstream benzene and ethylene footprints | Coal-based utilities in China raise it | derived |
| Production / process | about 0.9 t CO2e per t (indicative) | 31% | Superheated steam for dehydrogenation at about 600 C | Hydrogen by-product is usually burnt as fuel | indicative |
| Movement | about 0.05-0.1 t CO2e per t (indicative) | 3% | Tanker shipping | indicative | |
| Use | not applicable | – | Intermediate | Residual styrene emissions from UPR curing | n/a |
| End of life | about 3.4 t CO2 per t of polystyrene if incinerated (92.3% carbon) | – | PS and EPS are rarely recycled; much is landfilled or littered | Polystyrene can be depolymerised back to styrene | stoichiometry |
Other environmental impacts
Plastic litter from PS and EPS packaging; styrene vapour exposure; accident risk shown by the 2020 Vizag leak.
Levers to cut emissions
- Polystyrene depolymerisation back to styrene monomer
- Electrified or heat-pump steam for dehydrogenation
- Using by-product hydrogen as a low-carbon fuel or chemical
- Replacing EPS packaging with fibre-based materials
India
India's styrene footprint is imported, embedded in Gulf and Asian supply. Domestic action is downstream, through the 2022 single-use plastics ban and EPR rules for packaging (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 |
|---|---|---|---|---|
| Chemical recycling of polystyrene to styrene monomer (e.g. Agilyx, Pyrowave, INEOS Styrolution projects) | not published | not published | pilot and demonstration plants (indicative) | indicative |
| Bio-based styrene via bio-benzene and bio-ethylene (mass balance) | not published | not published | mass-balance certified volumes sold in Europe (indicative) | indicative |