Hydrocracking of vacuum gas and other oils using a post-treatment reactive distillation system

摘要

The invention relates to a hydrotreating and hydrocracking process for various oils nominally boiling between 600 and 1500° F. to produce diesel oil and lighter materials. The process includes a first hydrogenation reaction in the presence of multiple hydrogenation catalyst beds which is limited to the hydrogenation level needed for the removal of sulfur and nitrogen and for aromatic saturation and to produce an effluent of both hydrocracked oil and uncracked heavy oil. The effluent is then flashed to produce hydrocracked oil vapors and liquid uncracked heavy oil. The hydrocracked oil fraction is further hydrotreated by catalytic distillation in a post-treatment reactor to give the final product quality while the liquid uncracked heavy oil bypasses the post-treatment reactor. The process significantly reduces hydrogen consumption and reduces the overall reactor and catalyst volumes for a given level of performance.