Catalytic Cracking Gasoline Post-Treatment Process

By analyzing the operating data of industrial units in the treatment of high olefin and high sulfur content gasoline by different catalytic cracking gasoline post-treatment processes, it is found that the reduction of gasoline olefin and sulfur content will cause a large loss of octane number and a sharp rise in production costs.The reason is that when the gasoline desulfurization rate exceeds 97%, the olefin saturation rate increases sharply, resulting in an increase in hydrogen consumption and an increase in production costs.To this end, a step-by-step integrated process for olefin reduction and desulfurization in catalytically cracked gasoline is created, and the reduction of gasoline olefin content is achieved by a catalytic cracking process composed of directional regulation of gasoline.By strengthening the isomerization and selective hydrogen transfer reaction, the volume fraction of gasoline olefins is reduced to no more than 20% and the mass fraction of sulfur is no more than 300 μg/g.In order to provide suitable gasoline feedstock for subsequent gasoline desulfurization units.The gasoline desulfurization post-treatment process controls the gasoline desulfurization rate not to exceed 97% and the olefin saturation rate to not exceed 20%.In the end, the loss of octane number is greatly reduced, and the contradictory chain of desulfurization-olefin saturation-octane number loss-low-cost production is subtly resolved.The industrial application results show that under the same gasoline desulfurization rate, the olefin saturation rate and octane number loss of this process are greatly reduced, and the low-cost production of National V and National VI motor gasoline can be achieved. The continuous upgrade of gasoline quality provides strong support.