Study on the Structural Characteristics of Narrow Fractions of Catalytic Cracking Slurry and the Formation Pathway of Mesophase Pitch.

Compared with their respective feedstocks, all mesophase pitches showed a trend of increasing aromatic hydrogen (H ar ) content and decreasing aliphatic hydrogen (H α , H β , H γ , and H N ) content, which also confirms the occurrence of alkyl side chain cleavage, cycloalkanes dehydrogenation, and aromatic ring condensation during thermal polycondensation.

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In addition, the content of naphthenes in the three fractions is relatively close, while the paraffin content exhibits an increasing trend following the order FDO-1 (2.9%) < FDO-2 (5.3%) < FDO-3 (8.8%).

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Meanwhile, the sulfur and nitrogen contents of the products derived from each narrow fraction exhibit a decreasing trend with prolonged polycondensation time.

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