Process for hydrotreating a residue stream with hydrogen recycle

Patent metadata

Field	Value
Publication number	US-11028326-B2
Application number	US-201815884219-A
Country	US
Kind code	B2
Filing date	Jan 30, 2018
Priority date	Jan 30, 2018
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

The subject process enhances catalytic activity for demetallization and desulfurization of a residue feed stream by splitting a recycle hydrogen stream and feeding each of the split hydrogen streams to the first and second stages of demetallation and desulfurization, respectively, with interstage separation. The recycle hydrogen stream may first undergo scrubbing to remove acid gases and compression before recycle. The recycle hydrogen stream is taken from a first hot vapor stream from the first hydrotreating unit and a second hot vapor stream from the second hydrotreating unit.

First claim

The invention claimed is:

1. A process for hydrotreating a hydrocarbon resid stream comprising:
adding a first stage hydrogen stream and a water stream to a resid stream;
hydrotreating said resid stream over a demetallation catalyst to demetallize said resid stream in the presence of the first stage hydrogen stream to provide a demetallized resid stream reduced in metals and sulfur concentration, wherein said demetallation catalyst has a pore size distribution with at least about 25% of the pores on said demetallation catalyst being characterized as large pores;
separating said demetallized resid stream into a first stage hot vapor stream and a first stage hot liquid stream with a smaller concentration of hydrogen sulfide than in the demetallized resid stream;
adding a second stage hydrogen stream to said first stage liquid stream; and
hydrotreating said first stage liquid stream over a desulfurization catalyst and the second stage hydrogen stream to provide a desulfurized resid stream;
separating said desulfurized resid stream into a second stage hot vapor stream and a second stage hot liquid stream with a smaller concentration of hydrogen sulfide than in the desulfurized resid stream;
separating said first stage hot vapor stream and said second stage hot vapor stream to provide a cold vapor stream and a cold liquid stream;
compressing said cold vapor stream to provide a recycle hydrogen stream; and
splitting said recycle hydrogen stream into said first stage hydrogen stream and said second stage hydrogen stream.

2. The process of claim 1 wherein separating said first stage hot vapor stream and said second stage hot vapor stream to provide a cold vapor stream and a cold liquid stream further comprises separating said first stage hot vapor stream into a first stage cold vapor stream and a first stage cold liquid stream and separating said second stage hot vapor stream into a second stage cold vapor stream and a second stage cold liquid stream and combining said first stage cold vapor stream and said second stage cold vapor stream to provide said cold vapor stream.

3. The process of claim 1 wherein separating said first stage hot vapor stream and said second stage hot vapor stream to provide a cold vapor stream and a cold liquid stream further comprises combining said first stage hot vapor stream and said second stage hot vapor stream, separating said first stage hot vapor stream and said second stage hot vapor stream together into said cold vapor stream and said cold liquid stream.

4. The process of claim 1 further comprising absorbing hydrogen sulfide from said cold vapor stream into a solvent to provide a scrubbed cold vapor stream and compressing said scrubbed cold vapor stream.

5. The process of claim 4 further comprising splitting said scrubbed cold vapor stream into a purge stream and a recycle cold vapor stream and compressing said recycle cold vapor stream.

6. The process of claim 5 further comprising contacting said purge stream on one side of a membrane and transporting a permeate gas from said membrane to a make-up gas compressor.

7. The process of claim 1 wherein said resid stream comprise an asphaltic sulfur concentration of at least 10 wt % of total sulfur.

8. The process of claim 1 further comprising fractionating said second stage hot liquid stream.

9. The process of claim 8 further comprising fractionating said cold liquid stream.

10. The process of claim 8 further comprising flashing said second stage hot liquid stream to provide a hot flash vapor stream and a hot flash liquid stream and fractionating said hot flash liquid stream.

11. The process of claim 9 further comprising flashing said cold liquid stream into a cold flash liquid stream and a cold flash vapor stream and fractionating said cold flash liquid stream.

12. A process for hydrotreating a hydrocarbon resid stream comprising:
adding a first stage hydrogen stream and a water stream to a resid stream;
hydrotreating said resid stream over a demetallation catalyst to demetallize said resid stream in the presence of the first stage hydrogen stream to provide a demetallized resid stream reduced in metals and sulfur concentration;
separating said demetallized resid stream into a first stage hot vapor stream and a first stage hot liquid stream with a smaller concentration of hydrogen sulfide than in the demetallized resid stream;
adding a second stage hydrogen stream to said first stage liquid stream; and
hydrotreating said first stage liquid stream over a desulfurization catalyst and the second stage hydrogen stream to provide a desulfurized resid stream;
separating said desulfurized resid stream into a second stage hot vapor stream and a second stage hot liquid stream with a smaller concentration of hydrogen sulfide than in the desulfurized resid stream;
separating said first stage hot vapor stream and said second stage hot vapor stream to provide a cold vapor stream and a cold liquid stream;
compressing said cold vapor stream to provide a recycle hydrogen stream; and
taking said first stage hydrogen stream from said recycle hydrogen stream and taking said second stage hydrogen stream from said recycle hydrogen stream.

13. The process of claim 12 wherein separating said first stage hot vapor stream and said second stage hot vapor stream to provide a cold vapor stream and a cold liquid stream further comprises separating said first stage hot vapor stream into a first stage cold vapor stream and a first stage cold liquid stream and separating said second stage hot vapor stream into a second stage cold vapor stream and a second stage cold liquid stream and combining said first stage cold vapor stream and said second stage cold vapor stream to provide said cold vapor stream.

14. The process of claim 12 wherein separating said first stage hot vapor stream and said second stage hot vapor stream to provide a cold vapor stream and a cold liquid stream further comprises combining said first stage hot vapor stream and said second stage hot vapor stream, separating said first stage hot vapor stream and said second stage hot vapor stream together into said cold vapor stream and said cold liquid stream.

15. The process of claim 12 further comprising absorbing hydrogen sulfide from said cold vapor stream into a solvent to provide a scrubbed cold vapor stream and taking said first stage hydrogen stream from said scrubbed cold vapor stream and taking said second stage hydrogen stream from said scrubbed cold vapor stream.

16. The process of claim 12 wherein said resid stream comprise an asphaltic sulfur concentration of at least 10 wt % of total sulfur.

17. A process for hydrotreating a hydrocarbon resid stream comprising:
hydrotreating said resid stream over a demetallation catalyst to demetallize said resid stream in the presence of a first stage hydrogen stream to provide a demetallized resid stream reduced in metals and sulfur concentration, wherein said demetallation catalyst has a bimodal pore size distribution with at least about 25% of the pores on said demetallation catalyst being characterized as large pores;
separating said demetallized resid stream into a first stage hot vapor stream and a first stage hot liquid stream with a smaller concentration of hydrogen sulfide than in the demetallized resid stream;
hydrotreating said first stage liquid stream over a desulfurization catalyst and a second stage hydrogen stream to provide a desulfurized resid stream, wherein said desulfurization catalyst has a monomodal pore size distribution;
separating said desulfurized resid stream into a se

Assignees

• Uop Llc

Inventors

• Sun Ping

Classifications

• C10G65/04 Primary

  including only refining steps · CPC title

• C10G2300/42

  Hydrogen of special source or of special composition · CPC title

• C10B57/005 Primary

  After-treatment of coke, e.g. calcination desulfurization · CPC title

• C10G2400/16

  Residues · CPC title

• C10G2300/206

  Asphaltenes · CPC title