Abstract: The functional group structure of asphaltenes from coal tar and petroleum residue was characterized by Fourier transform infrared spectroscopy. The hydrogen bond region, aliphatic C—H stretching vibration region and C—O region were fitted by software Origin 2018. The results show that the two asphaltenes are mainly composed of carbon and hydrogen, and the content of heteroatoms in the two asphaltenes is obviously different, but the types of heteroatom functional groups are basically the same. The hydrogen bonds in coal tar asphaltenes are formed by the self-association of O atoms and O atoms in aromatic ether bonds, and the hydrogen bonds of coal tar asphaltene are formed by O atom in aromatic ether bond and O atom in benzene ring. The alkyl side chains of coal tar asphaltenes are shorter than that of residue asphaltene.

Key words: residue, coal tar, asphaltene, infrared spectroscopy, hydrogen bond, functional group