Process research on the hydrocarbon conversion of straight-run gas oil (SRGO) to chemical materials

Abstract

To deepen the understanding of the reaction process for SRGO-hydrocarbon conversion, this article systematically explained the process conditions and conversion performance of SRGO-hydrocarbon conversion to produce chemical materials, based on the reaction mechanism. Ni & W and USY molecular sieve were selected as the hydrogenation active component and the cracking component of the hydrocracking catalyst, respectively. γ-Al2O3 and USY molecular sieve were mixed and extruded to prepare the carrier for the hydrocracking catalyst. The results indicate that cycloalkanes and aromatics are preferentially converted into heavy naphtha (HN) in the primary cracking process. The aromatic-potential-content of HN is high during shallow cracking due to the high content of cycloalkane and aromatic in SRGO. As the cracking depth increases, the cracking of paraffin is gradually strengthened, and the absolute paraffin-amount in diesel accelerates to decrease. Simultaneously, due to the enrichment of paraffin in HN, the aromatic-potential-content of HN decreases. In addition, the experimental results also indicate that although reaction temperature and LHSV are both means of controlling the conversion rate of SRGO, even if the conversion rate of SRGO is similar, high temperature is still conducive to the formation of light components, such as light naphtha (LN). High H2 pressure will inhibit the conversion of HN to lighter components and the conversion of paraffin in diesel to HN.