Dodecane (also known as dihexyl, bihexyl, adakane 12, or duodecane) is an oily liquid n-alkane hydrocarbon with the chemical formula C<sub>12</sub>H<sub>26</sub> (which has 355 isomers).
It is used as a solvent, distillation chaser, and scintillator component. It is used as a diluent for tributyl phosphate (TBP) in nuclear reprocessing plants.
The combustion reaction of dodecane is as follows:
One litre of fuel needs about 15 kg of air to burn (2.6 kg of oxygen), and generates 2.3 kg (or 1.2 m<sup>3</sup>) of CO<sub>2</sub> upon complete combustion.
In recent years, n-dodecane has garnered attention as a possible surrogate for kerosene-based fuels such as Jet-A, S-8, and other conventional aviation fuels. It is considered a second-generation fuel surrogate designed to emulate the laminar flame speed, largely supplanting n-decane, primarily due to its higher molecular mass and lower hydrogen-to-carbon ratio which better reflect the n-alkane content of jet fuels.