The conversion depth and product changes of Vacuum wax oil under hydrocracking conditions were investigated,and the distribution patterns of hydrocarbons were explored through fine cutting and characterization.The results showed that the yield of<220℃ components in hydrocracking products increased with increasing of conversion rate,while the yield of>400℃ components gradually decreased with increasing of conversion rate.The change in hydrocarbon composition conformed to the principle that polycyclic aromatics were preferentially hydrogenated and migrated towards light components,while alkanes were retained,clarifying the relationship between the yield and quality of hydrocracking products.
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