The output is at three levels : heavy oil, middle oil, gasoline.
2.
In this way, heavy oil and middle oil fractions are also reused in this process.
3.
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.
4.
The first plant that has aroused the concern of the people was the so-called middle oils, or a large plant ( 127, 000 m 2 ) dehydrosulphurization of crude oil, designed by Eni.
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