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US 8,574,425 B2Granted
Process for removing heavy polynuclear aromatic compounds from a hydroprocessed stream
AssigneeUop LLC
InventorsRichard K. Hoehn, Daniel J. Breitenfeldt
Life of this patent
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Abstract
The present invention is an improved process for stripping HPNA's from hydroprocessed streams in a fractionation column having a split shell configuration. Only one vapor stripping feed is required to the split shell of the fractionation column. The resulting reduction in steam requirement provides a superior fractionation in the column.
Claims20
A process for removing HPNA's from a hydroprocessed stream comprising:
- feeding the hydroprocessed stream comprising HPNA's to a second compartment in a fractionation column also having a first compartment;
- feeding a stripping vapor to the second compartment to strip lighter hydrocarbons from the hydroprocessed stream and provide a stripped hydroprocessed stream and an enriched stripping vapor;
- withdrawing the stripped hydroprocessed stream from the second compartment with a greater concentration of HPNA's than in the hydroprocessed stream fed to the second compartment;
- withdrawing the enriched stripping vapor enriched with lighter hydrocarbons from the second compartment;
- and
- passing the enriched stripping vapor exiting downwardly from the second compartment to the first compartment in the fractionation column.
3 more elements
A process for fractionating a hydroprocessed stream comprising:
- feeding a first hydroprocessed stream to a fractionation column;
- stripping heavier portions of the first hydroprocessed stream in a first compartment of the fractionation column;
- feeding a second hydroprocessed stream to a second compartment of the fractionation column;
- feeding a stripping vapor to the second compartment to strip the second hydroprocessed stream of lighter hydrocarbons to provide a stripped hydroprocessed stream and an enriched stripping vapor stream;
- withdrawing the stripped hydroprocessed stream from the second compartment with a greater concentration of HPNA's than in the second hydroprocessed stream fed to the second compartment;
- withdrawing the enriched stripping vapor enriched with lighter hydrocarbons from the second compartment;
- and
- passing the enriched stripping vapor exiting downwardly from the second compartment to the first compartment for stripping lighter materials from heavier portions of the first hydroprocessed stream.
5 more elements
A process for hydroprocessing a hydrocarbon stream comprising:
- contacting a hydrocarbon stream with hydrogen and hydroprocessing catalyst under hydroprocessing conditions to provide a hydroprocessed effluent;
- separating the hydroprocessed effluent to provide a first hydroprocessed stream;
- feeding the first hydroprocessed stream to a fractionation column having a first compartment and a second compartment;
- feeding a second hydroprocessed stream comprising HPNA's to the second compartment;
- feeding a stripping vapor to the second compartment to strip lighter hydrocarbons from the second hydroprocessed stream and provide a stripped hydroprocessed stream and an enriched stripping vapor;
- withdrawing the stripped hydroprocessed stream from the second compartment with a greater concentration of HPNA's than in the hydroprocessed stream fed to the second compartment;
- withdrawing the enriched stripping vapor enriched with lighter hydrocarbons from the second compartment;
- and
- passing the enriched stripping vapor exiting downwardly from the second compartment to a first compartment in the fractionation column.
6 more elements
Dependencies are inferred from the claim text.