Abstract: Using cis-decalin, trans-decalin, tetralin and indane as model compounds of hydrogenated aromatics, the pyrolysis performance of hydrogenated aromatics with different structures was rapidly evaluated by high-temperature cracker and gas chromatography. The results showed that the ring-opening cracking reaction of decalin was the main reaction of decalin pyrolysis, and the selectivity of the ring-opening cracking reaction decreased, the dehydrogenation reaction and hydrogen transfer reaction were strengthened, and the atom utilization of reactant became unreasonable when the reaction temperature increased. Affected by the large π bond of the benzene ring, the bond energy of C—H in the tetralin and indanenaphthene rings is lower, and their dehydrogenation capacity and hydrogen transfer capacity are stronger, the products are mainly aromatic hydrocarbons. Cycloalkanes with high hydrogen saturation are high-quality raw materials for the production of light olefins, and aromatic naphthenes containing benzene rings are high-quality raw materials for the production of benzene, toluene and xylene (BTX).

Key words: high-temperature cracker, hydrogenated aromatics, thermal cracking, light olefins, benzene, toluene, xylene