4. Bitumen composition

The search for bitumen's chemical formula has been a passion for researchers for a very long time, and even today there are questions about its composition. The numerous works in the literature [5] describe a situation that can be summarized as follows.

• The first operation involves separating the larger molecules by precipitation using an aliphatic solvent, most often normal heptane (nC ₇ ). The precipitated fraction is called...