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US 11,028,326 B2Granted
Process for hydrotreating a residue stream with hydrogen recycle
AssigneeUop LLC
InventorPing Sun
Life of this patent
Estimating the term…
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.
Claims20
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.
8 more elements
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.
8 more elements
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 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;
- 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 a cold vapor stream and said cold liquid stream;
- and
- taking said first stage hydrogen stream from said cold vapor stream and taking said second stage hydrogen stream from said cold vapor stream.
4 more elements
Dependencies are inferred from the claim text.