Abstract
The possibility of obtaining anisotropic pitches by heat treatment of various types of petroleum feedstock is shown - isotropic pitches from heavy pyrolysis tar and heavy catalytic cracking gas oil. The dependences of the change in the group compositionof the heat treatment residues on the duration of isothermal exposure, the correlation between the components insoluble in toluene and quinoline, have been established. Features of the optical texture of the heat treatment residues of isotropic petroleum pitches of various origins are revealed.
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