Patent ID: 9631150
Date: 2017-04-25
CPC Classifications: C10G,C10L

Claim:
1. A process for upgrading gas oils to distillate hydrocarbons, the process comprising: dividing a first gas oil stream into a first and second portions of equal composition; mixing a second gas oil stream and the first portion of the first gas oil stream to form a mixed gas oil stream; contacting the mixed gas oil stream and hydrogen with a first hydroconversion catalyst in a first hydrocracker reaction system to convert at least a portion of the hydrocarbons in the mixed gas oil stream to distillate hydrocarbons; recovering an effluent from the first hydrocracker reaction system comprising unconverted hydrocarbons and the distillate hydrocarbons; fractionating the effluent from the first hydrocracker reaction system into one or more hydrocarbon fractions including a fraction comprising the unconverted hydrocarbons; contacting hydrogen and the fraction comprising the unconverted hydrocarbons with a second hydroconversion catalyst in a second hydrocracker reaction system downstream from the first hydrocracker reaction system to convert at least a portion of the unconverted hydrocarbons to distillate hydrocarbons; feeding the effluent from the second hydrocracker reaction system to the fractionating step for concurrent fractionation with the effluent from the first hydrocracker reaction system; feeding a stream consisting of the second portion of the first as oil stream to a third hydrocracker reaction system; contacting a stream consisting of hydrogen and the second portion of the first gas oil stream with a third hydroconversion catalyst in the third hydrocracker reaction system to convert at least a portion of the hydrocarbons in the second portion to distillate hydrocarbons; fractionating an effluent from the third hydrocracker reaction system to recover two or more hydrocarbon fractions, wherein the first gas oil stream is different than the second gas oil stream.