公开(公告)号：US20170342331A1

公开(公告)日：2017-11-30

申请号：US15538234

申请日：2015-12-17

Applicant: AXENS

Inventor： Thibault SAUGE ,  Roberto GONZALEZ LLAMAZARES ,  Jerome BONNARDOT ,  Jacinthe FRECON

IPC: C10G47/00 ,  C07C5/10 ,  C07C15/56 ,  C10G7/00

CPC classification number: C10G47/00 ,  C07C5/10 ,  C07C15/56 ,  C10G7/00

Abstract: The invention concerns a process and a facility for reducing the concentration of heavy polycyclic aromatic compounds (HPNA) in the recycle loop of hydrocracking units, which comprises a fractionation column.In accordance with this process, a stream is withdrawn from the fractionation column at the level of at least one plate located between the supply plate and the plate for withdrawing the heaviest distillate fraction; the stream is stripped in an external stripping step by a stripping gas, in the presence of a portion of the residue. The separated gaseous effluent is recycled to the column, advantageously as a stripping gas, and the liquid fraction is recycled to the hydrocracking step; a residue is purged in the stripping step.

公开(公告)号：US20170349844A1

公开(公告)日：2017-12-07

申请号：US15538967

申请日：2015-12-17

Applicant: AXENS

Inventor： Thibault SAUGE ,  Roberto GONZALEZ LLAMAZARES ,  Jerome BONNARDOT ,  Jacinthe FRECON

IPC: C10G67/02

Abstract: The invention concerns a process and a facility for reducing the concentration of heavy polycyclic aromatic compounds (HPNA) in the recycle loop of hydrocracking units, which comprises a fractionation column.In accordance with this process, a portion of the stream present at the level of at least one plate (I) which is the supply plate or a plate located between the supply plate and said residue evacuation point, or if stripping gas is injected, between the supply plate and said stripping gas injection point, is withdrawn from the fractionation column.A portion, preferably all, of said withdrawn stream is recycled to the hydrocracking step directly or after optional separation of the gases. The residue is purged in its entirety.In a preferred embodiment, a portion of the stream present at the level of at least one plate (II) located between the supply plate and the plate for withdrawing the heaviest distillate fraction is also withdrawn from the column. After stripping, all or a portion of the gas is recycled to the column and the liquid is sent for hydrocracking.

公开(公告)号：US20170349840A1

公开(公告)日：2017-12-07

申请号：US15539006

申请日：2015-12-17

Applicant: AXENS

Inventor： Thibault SAUGE ,  Roberto GONZALEZ LLAMAZARES ,  Jerome BONNARDOT ,  Jacinthe FRECON

IPC: C10G47/00 ,  B01D3/14 ,  C07C5/10 ,  C10G7/00

CPC classification number: C10G47/00 ,  B01D3/14 ,  C07C5/10 ,  C10G7/00

Abstract: The invention concerns a process and a facility for reducing the concentration of heavy polycyclic aromatic compounds (HPNA) in the recycle loop of hydrocracking units, which comprises a fractionation column.In accordance with this process, a portion of the stream present at the level of at least one plate located between the plate for supplying hydrocracked effluent and the plate for withdrawing the distillate fraction which is the heaviest is withdrawn from the fractionation column and at least a portion of said withdrawn stream is recycled to the column directly or after optional liquid separation, and optionally a portion of said withdrawn stream is recycled to the hydrocracking step directly or after optional gas separation.