Processes for recovering hydrocarbons from a drag stream from a slurry hydrocracker

• US 10,041,011 B2
• Filed: 11/06/2014
• Issued: 08/07/2018
• Est. Priority Date: 11/06/2014
• Status: Active Grant

• Current Assignee: UOP Llc (Honeywell International Inc.)
• Original Assignee: UOP Llc (Honeywell International Inc.)
• Inventors: Govindhakannan, Jagannathan, Haizmann, Robert, Pham, Trung, Lefebvre, Hans G.
• Primary Examiner(s): Stein, Michelle
• Application Number:
  US14/534,664
• Publication Number:
  US 20160130511A1
• Time in Patent Office: 1,370 Days
• CPC Class Codes: C10G 1/02 by distillation
• CPC Class Codes: C10G 1/04 by extraction
• CPC Class Codes: C10G 2400/06 Gasoil
• CPC Class Codes: C10G 2400/16 Residues
• CPC Class Codes: C10G 47/26 suspended in the oil, e.g. slurries
• CPC Class Codes: C10G 53/02 plural serial stages only
• CPC Class Codes: C10G 53/04 including at least one extraction step
• CPC Class Codes: C10G 67/02 plural serial stages only
• CPC Class Codes: C10G 67/04 including solvent extraction as the refining step in the absence of hydrogen

Abstract

A process for recovering hydrocarbons from a slurry hydrocracking reactor. The hydrocarbons are recovered by taking a drag stream of the slurry in the reactor. After separating lighter hydrocarbons in a separation zone, the heavier hydrocarbons can be processed in a deashing zone, with a vacuum column bottoms from a separation of the effluent stream recovered from the reactor. The deashing zone can recover the heavier hydrocarbons in a deashed pitch. Additionally, a VGO rich stream from the deashing zone may be recycled back to the reactor.

Claims

1. A process for recovering hydrocarbons from a hydrocracking zone, the process comprising:

cracking a feed stock in a hydrocracking zone to produce a converted hydrocarbon stream, the hydrocracking zone comprising a slurry hydrocracker;

withdrawing an effluent stream from the slurry hydrocracker in the hydrocracking zone;

passing the effluent stream to a high pressure separator;

removing a drag stream taken from a bottom half of the slurry hydrocracker in the hydrocracking zone, the drag stream comprising a mixture of catalyst, coke, converted hydrocarbons, and unconverted hydrocarbons;

separating the drag stream into a vapor portion and a liquid portion, the vapor portion of the drag stream comprising converted hydrocarbons; and

,

separating HVGO from the liquid portion of the drag stream with a solvent in a deashing zone.

2. The process of claim 1 further comprising:

combining the vapor portion of the drag stream with the converted hydrocarbon stream to form a combined hydrocarbon stream.

3. The process of claim 2 wherein the vapor portion of the drag stream and the converted hydrocarbon stream are combined in a separation zone, and the process further comprising:

separating the combined hydrocarbon stream into a C4−

hydrocarbon stream and a C5+ hydrocarbon stream.

4. The process of claim 3 further comprising:

separating the C5+ hydrocarbon stream into a transportation fuel stream and a residue stream.

5. The process of claim 4 further comprising:

passing the residue stream to a vacuum separation zone comprising at least one vacuum column; and

,

separating the residue stream into an LVGO stream, an HVGO stream and a pitch stream.

6. The process of claim 5 further comprising:

passing at least a portion of the HVGO stream from the vacuum separation zone to the hydrocracking zone; and

,

passing the HVGO stream separated from the liquid portion of the drag stream to the hydrocracking zone.

7. The process of claim 6 further comprising:

combining the at least a portion of the HVGO stream from the vacuum separation zone and the HVGO stream separated from the liquid portion of the drag stream for form a combined HVGO stream; and

,

passing the combined HVGO stream to the hydrocracking zone.

8. The process of claim 1 further comprising:

separating the liquid portion of the drag stream in the deashing zone into a dried solids, a deashed pitch, and the HVGO stream.

9. The process of claim 8 wherein the dried solids comprises an insoluble portion of the liquid portion of the drag stream.

10. The process of claim 9 further comprising:

passing a pitch from a bottoms stream of a vacuum column to the deashing zone.

11. The process of claim 10 wherein the pitch comprises a portion of the converted hydrocarbon stream from the hydrocracking zone.

12. A process for recovering hydrocarbons from a hydrocracking zone, the process comprising:

removing a drag stream taken from a bottom half of a slurry hydrocracker in a hydrocracking zone;

passing the drag stream to a first separation zone, the drag stream comprising a mixture of catalyst, coke, converted hydrocarbons, and unconverted hydrocarbons;

separating the drag stream in the first separation zone into a vapor portion and a liquid portion, the vapor portion of the drag stream comprising converted hydrocarbons;

separating the liquid portion of the drag stream in a second separation zone into an HVGO stream and a pitch stream;

withdrawing an effluent stream from the slurry hydrocracker in a hydrocracking zone; and

passing the effluent stream to a third separation zone having a high pressure separator, the third separation zone being different from the first separation zone and the second separation zone.

13. The process of claim 12 wherein the pitch stream comprises a deashed pitch stream, and the process further comprising:

removing solids from the liquid portion of the drag stream in the second separation zone.

14. The process of claim 12 further comprising:

passing the vapor portion of the drag stream to the third separation zone.

15. The process of claim 14 further comprising:

separating the vapor portion of the drag stream in the third separation zone into a C4−

hydrocarbon stream and a C5+ hydrocarbon stream.

16. The process of claim 15 further comprising:

separating the C5+ hydrocarbon stream into a transportation fuel stream and a residue stream.

17. The process of claim 16 further comprising:

passing the residue stream to a vacuum separation zone comprising at least one vacuum column; and

,

separating the residue stream into a LVGO stream, an HVGO stream and a pitch stream.

18. The process of claim 17 further comprising:

passing the pitch stream to the second separation zone;

combining the HVGO stream from the at least one vacuum column and the second separation zone to form a combined HVGO stream; and

,

passing the combined HVGO to the hydrocracking zone.

19. A process for recovering hydrocarbons from a hydrocracking zone, the process comprising:

removing a drag stream taken from a bottom half of a slurry hydrocracker;

separating the drag stream in a first separation zone into a vapor portion and a liquid portion, the drag stream comprising a mixture of catalyst, coke, converted hydrocarbons, and unconverted hydrocarbons, and wherein at least a portion of the vapor portion of the drag stream comprises converted hydrocarbons;

withdrawing an effluent stream from the slurry hydrocracker;

separating the vapor portion of the drag stream and a portion of an effluent stream from the slurry hydrocracker into a C4−

hydrocarbon stream and a C5+ hydrocarbon stream, the effluent stream being different than the drag stream;

recycling a portion of the C5+ hydrocarbon stream back to the slurry hydrocracker;

deashing the liquid portion of the drag stream with a solvent in a deashing zone to provide a dried solids, a deashed pitch and an HVGO stream; and

,

recycling the HVGO stream back to the slurry hydrocracker.