Kaleigh Harrison
A potential pathway to fully synthetic jet fuel is gaining traction, as recent test results indicate producers may be able to eliminate fossil-based blending components altogether. Universal Fuel Technologies (Unifuel) has demonstrated that a byproduct from today’s dominant sustainable aviation fuel (SAF) process can be upgraded into aromatic compounds—one of the key missing elements in current fuel formulations.
Independent testing by Washington State University assessed a blended fuel combining hydroprocessed esters and fatty acids (HEFA) with aromatics derived from Unifuel’s Flexiforming process. The results suggest the fuel meets core aviation performance standards, pointing to a viable route toward fully synthetic, drop-in jet fuel compatible with existing aircraft systems.
Converting SAF Byproducts into Functional Fuel Components
HEFA remains the most widely deployed SAF pathway, but it primarily produces paraffinic hydrocarbons. These lack the aromatics required for compatibility with conventional jet fuel systems, which is why HEFA-based fuels must still be blended with petroleum-derived components.
Unifuel’s approach targets this limitation by upgrading HEFA-derived naphtha—a byproduct that can represent a significant share of output—into synthetic aromatic kerosene. Instead of treating this stream as low-value, the process repositions it as a necessary input for fuel formulation.
This shift has implications beyond chemistry. By generating both paraffinic and aromatic components in-house, producers could improve yield efficiency and reduce reliance on external blending inputs. The result is a more integrated production model that extracts additional value from existing feedstocks while addressing a known technical barrier in SAF development.
Performance Validation and Scaling Potential
The test fuel, composed of 84% HEFA-based fuel and 16% synthetic aromatics, was evaluated under ASTM-authorized screening protocols. It met key benchmarks, including density, viscosity, freeze point, and flash point—metrics required for aviation use.
Energy content was found to be on par with conventional jet fuel, while maintaining the molecular and distillation characteristics needed for modern engines. Aromatics play a critical role here, not just in combustion performance but in maintaining seal integrity within aircraft fuel systems.
The broader opportunity lies in scalability. Flexiforming is designed to integrate with existing SAF infrastructure, including HEFA, Fischer-Tropsch, and ethanol-to-jet facilities. This “bolt-on” model could allow producers to expand output and improve product quality without major capital investment or operational disruption.
There are still steps ahead, particularly around regulatory approval. Unifuel’s ethanol-to-jet pathway is already progressing through ASTM evaluation, and similar validation will be required for this approach. If successful, the industry may gain a more practical route to producing fully synthetic jet fuel—one that aligns with existing assets while reducing dependence on fossil inputs.