middle oil , auch: carbolic oil

The output is at three levels: heavy oil, middle oil, gasoline.

Obtained from Middle oil by solvent extraction and distillation.

The reaction produces heavy oils, middle oils, gasoline, and gases.

In this way, heavy oil and middle oil fractions are also reused in this process.

The middle oil is hydrogenated in order to get more gasoline and the heavy oil is mixed with the coal again and the process restarts.

Synthetic fuel grades included "T.L. [jet] fuel ", "first quality aviation gasoline", "aviation base gasoline", and "gasoline - middle oil"; and "producer gas" and diesel were synthesized for fuel as well (e.g., converted armored tanks used producer gas).