Patent ID: 8840854

Claim:
An apparatus for producing diesel comprising: a hydrocracking reactor in communication with one or more compressors on a make-up hydrogen line and a hydrocarbon feed line for hydrocracking the hydrocarbon stream to lower boiling hydrocarbons; a cold separator in communication with the hydrocracking reactor for providing a vaporous hydrocracking effluent stream comprising hydrogen in an overhead line and a liquid hydrocracking effluent stream in a bottoms line and the cold separator being in communication with an overhead line of a warm separator; a recycle gas compressor in communication with the hydrocracking reactor for compressing the vaporous hydrocracking effluent stream comprising hydrogen to provide a recycle hydrogen stream in a recycle hydrogen line; a hydrotreating reactor in communication with the recycle hydrogen line and the hydrocracking reactor for hydrotreating a diesel stream to produce low sulfur diesel; the 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; a fractionation column in communication with the hydrocracking reactor for fractionating a hydrocracking effluent stream to produce the diesel stream and the hydrotreating reactor being in communication with the fractionation column; and a hydrotreating fractionation column in communication with the bottoms line of the warm separator for fractionating the liquid hydrotreating effluent stream to provide a low sulfur diesel stream.