Abstract: The selective hydrogenation technology for catalytic pyrolysis gasoline to produce aromatics-extraction feedstock (RGTA) was developed. A low-aromatics-saturation catalyst, RGA-1, was developed, compared with a reference catalyst it exhibits a markedly lower aromatics saturation while achieving deep denitrogenation. Commercial application results demonstrated that, as processing heavy catalytic pyrolysis gasoline feedstock with a sulfur mass fractions of 840 μg/g, a nitrogen mass fractions of 35.7 μg/g, an olefin mass fractions of 18.3%, and an aromatica mass fractions of 57.5%, the aromatics saturation rate of the hydrogenated product was 3.8%. The mass fractions of sulfur and nitrogen in the C₆—C₈ fraction of hydrogenated product were both less than 1.0 μg/g. The technology showed excellent selectivity, low aromatics saturation rate, stable long-term operation, and produces feedstock meeting the requirements for subsequent aromatic extraction units.

Key words: deep catalytic cracking gasoline, selective hydrogenation, aromatics extraction, denitrogenation, aromatics saturation rate