Patent ID: 8608940

Claim:
A process for producing diesel from a hydrocarbon stream comprising: compressing a make-up hydrogen stream in a first compressor to provide a first compressed make-up hydrogen stream; compressing a first portion of the first compressed make-up hydrogen stream in a second compressor to provide a second compressed make-up hydrogen stream; taking a second portion of the first compressed make-up hydrogen stream as a second hydroprocessing hydrogen stream; hydrocracking a hydrocarbon stream in the presence of the second compressed make-up hydrogen stream and hydrocracking catalyst to provide a first hydroprocessing effluent stream; hydrotreating a diesel stream in the presence of the second hydroprocessing hydrogen stream and hydrotreating catalyst to provide a second hydroprocessing effluent stream; fractionating at least a portion of the first hydroprocessing effluent stream to provide said diesel stream; separating a second hydroprocessing effluent to provide a vaporous second hydroprocessing effluent stream; adding said vaporous second hydroprocessing effluent stream to said first portion of the first compressed make-up hydrogen stream; and letting down said first portion of the first compressed make-up hydrogen stream before adding said vaporous second hydroprocessing effluent stream thereto.