Table 2.
Comparisons of the relevant fuel properties of the 1,8-cineole (eucalyptol) with ethanol
| 1,8-Cineole | Ethanol | |
|---|---|---|
| Research octane number (RON) | 99.2a | 109a |
| Motor octane number (MON) | 91.0a | 90a |
| Sensitivity (RON-MON) | 8.2 | 19 |
| Energy density [MJ/L] | 33.5c | 20.2c |
| Heat of vaporization [kJ/kg] | 255c | 919c |
| Vapor pressure [kPa @25 °C] | 0.25c | 7.833c |
| Water solubility [g/L @21 °C] | 3.5c | Fully misciblec |
| Oxygen content [% of total mass] | 10.4 | 34.7c |
| Anti-knock index AKI = ½(RON + MON) | 95.1 | 99.5c |
| Boiling point [°C] | 176c | 78.5c |
| Freez point/melting point [°C] | 1c | − 114c |
| Flash point [°C] | 49c | 14c |
| OSHA hazards category | 2c | 2c |
aOctane numbers for RON and MON determined by ASTM D2699 and D2700 respectively in collaboration with Intertek Group plc in Benicia CA
bEnergy density based on the lower heating values (LHV) first reported by Wallner et al. [81] and later in the NREL fuel properties database [74]
cPhysical properties gathered from the NREL Co-optima fuel properties database [74]