Patent ID: 8747784

Claim:
An apparatus for producing diesel comprising: a hydrocracking reactor in communication with a compressor on a make-up hydrogen line and a hydrocarbon feed line for hydrocracking the hydrocarbon stream to lower boiling hydrocarbons, said make-up hydrogen line joining with an overhead line to provide an introductory hydrogen line upstream of a recycle gas compressor; said recycle gas compressor in downstream communication with the hydrocracking reactor and the make-up hydrogen line for compressing a vaporous hydrocracking effluent stream comprising hydrogen and a compressed make-up hydrogen stream to provide a compressed hydrogen stream in a compressed hydrogen line; a hydrotreating reactor in communication with the compressed hydrogen line and the hydrocracking reactor for hydrotreating a diesel stream to produce low sulfur diesel; a warm separator in communication with the hydrotreating reactor for separating the hydrotreating effluent stream into a vaporous hydrotreating effluent stream comprising hydrogen in an overhead line and a liquid hydrotreating effluent stream in a bottoms line and the recycle gas compressor in communication with the overhead line; and a cold separator in communication with the hydrocracking reactor for providing the vaporous hydrocracking effluent stream comprising hydrogen in an overhead line and the liquid hydrocracking effluent stream in a bottoms line and the cold separator being in communication with an overhead line of the warm separator.