Sustainable aviation fuel production
Sustainable aviation fuel production is the industrial process of converting renewable or waste-based feedstocks into aviation-range hydrocarbons that meet approved fuel standards for commercial flight.
Production pathways differ by feedstock, chemistry, and upgrading steps, but all approved SAF routes are designed to produce fuels compatible with existing aircraft and airport infrastructure.
How is sustainable aviation fuel produced?
SAF is produced through chemical pathways that transform renewable carbon sources into hydrocarbon molecules suitable for aviation use.
The production process typically includes:
- Feedstock preparation
- Conversion into intermediate molecules
- Hydrocarbon synthesis or upgrading
- Separation into jet-range fractions
- Blending with conventional jet fuel
Each pathway uses different chemistry to reach the same goal: aviation-compatible fuel.
What feedstocks are used in sustainable aviation fuel production?
Feedstock selection determines which SAF production pathway can be used.
Common feedstocks include:
Oils and fats
- used cooking oil
- tallow
- vegetable oils
Biomass
- forestry residues
- agricultural residues
Biogas
- Agricultural and other waste processed through anaerobic digestors
Waste-derived feedstocks
- municipal solid waste
- landfill-derived gas
Synthetic inputs
- renewable hydrogen
- captured carbon dioxide
Feedstock availability strongly influences plant location and project economics.
What production pathways are used for SAF?
Several approved pathways are used today to produce sustainable aviation fuel.
Major pathways include:
- Hydroprocessed Esters and Fatty Acids (HEFA)
- Fischer-Tropsch synthesis
- Alcohol-to-jet
- Power-to-liquids
Each pathway uses a different intermediate conversion route before producing aviation fuel fractions.
For standards detail, see ASTM approved SAF pathways.
How does Fischer-Tropsch fit into sustainable aviation fuel production?
Fischer-Tropsch is one SAF production pathway that converts synthesis gas into synthetic hydrocarbons later upgraded into jet-range fuel molecules.
This pathway includes:
- Feedstock conversion into synthesis gas
- Fischer-Tropsch synthesis
- Hydroprocessing into aviation fuel fractions
The resulting aviation blending component is Fischer-Tropsch Synthetic Paraffinic Kerosene (FT-SPK).
See:
Why does feedstock choice matter in SAF production?
Feedstock influences carbon intensity, plant complexity, and fuel economics.
Different feedstocks affect:
- carbon availability
- pretreatment requirements
- hydrogen demand
- conversion efficiency
Two plants producing SAF may look very different depending on feedstock type.
Why does upgrading matter in SAF production?
Most SAF pathways do not produce finished jet fuel directly.
Instead, intermediate hydrocarbons must be upgraded through refining steps such as:
- hydroprocessing
- cracking
- fractionation
This creates jet-range molecules that meet aviation specifications.
How is SAF production different from petroleum refining?
SAF production starts with non-petroleum carbon sources rather than crude oil.
Instead of refining fossil crude fractions, SAF plants convert renewable or waste-derived carbon into synthetic hydrocarbons.
This changes:
- front-end processing
- feedstock logistics
- carbon accounting
The final fuels remain hydrocarbon-based, making them compatible with today’s engines.
Why is SAF production expanding globally?
SAF production is expanding because aviation needs access to reliable sources of lower-carbon liquid fuels that work with existing aircraft systems.
Growth is being driven by:
- airline fuel demand
- fuel security
- regional fuel mandates
- project investment
- technology readiness
Production capacity is growing through both new standalone plants and refinery integration.
What determines whether a SAF project is commercially viable?
Commercial viability depends on feedstock supply, pathway efficiency, capital cost, and market incentives.
Projects must align:
- feedstock availability
- production scale
- offtake demand
- policy environment
These factors vary significantly by region.
Frequently asked questions
Does every SAF plant use the same production method?
No. Production pathways differ depending on feedstock and chemistry.
Is SAF produced directly as jet fuel?
Usually no. Most pathways produce intermediates that require upgrading.
Can waste be used for SAF production?
Yes. Several approved pathways use waste-derived feedstocks.
Is Fischer-Tropsch the main SAF production pathway?
It is one approved pathway among several commercial routes.