Integrated hydrotreating and isomerization system with aromatic separation
AssigneeSaudi Arabian Oil Company
InventorOmer Refa Koseoglu
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Abstract
Deep desulfurization of hydrocarbon feeds containing undesired organosulfur compounds to produce a hydrocarbon product having low levels of sulfur, i.e., 15 ppmw or less of sulfur, is achieved by hydrotreating the feed under mild conditions, and separating the hydrotreated effluent into an aromatic-rich fraction which contains a substantial amount of the aromatic refractory and sterically hindered sulfur-containing compounds, and an aromatic-lean fraction. The aromatic-rich fraction is contacted with isomerization catalyst, and the isomerized aromatic-rich fraction is recycled to the mild hydrotreating process.
Claims23
An apparatus for processing a hydrocarbon feed containing undesired organosulfur compounds comprising:
- a mild hydrotreating zone operable to convert labile organosulfur compounds, the mild hydrotreating zone including an inlet for receiving the hydrocarbon feed and an outlet for discharging hydrotreated effluent;
- an aromatic separation zone including a stage-type extractor or a differential extractor, and a source of liquid solvent as aromatic extraction medium, the aromatic separation zone operable to extract aromatic organosulfur compounds from the hydrotreated effluent, the aromatic separation zone including one or more inlets for receiving the hydrotreated effluent and liquid solvent, an aromatic-rich outlet and an aromatic-lean outlet;
- and
- an isomerization reaction zone having
- an inlet in fluid communication with the aromatic-rich outlet and
- an isomerization reaction zone outlet in fluid communication with the mild hydrotreating zone inlet for recycling isomerate.
An apparatus for processing a hydrocarbon feed containing undesired organosulfur compounds comprising:
- a mild hydrotreating zone operable to convert labile organosulfur compounds, the mild hydrotreating zone including an inlet for receiving the hydrocarbon feed and an outlet for discharging hydrotreated effluent;
- an aromatic separation zone operable to extract aromatic organosulfur compounds from the hydrotreated effluent, the aromatic separation zone including an inlet for receiving the hydrotreated effluent, an aromatic-rich outlet and an aromatic-lean outlet;
- an adsorption zone having an inlet in fluid communication with the aromatic-rich discharge outlet and an adsorption zone outlet for discharging extract having a reduced concentration of nitrogen-containing compounds,
- an isomerization reaction zone having
- an inlet in fluid communication with the adsorption zone outlet and
- an isomerization reaction zone outlet in fluid communication with the mild hydrotreating zone inlet for recycling isomerate.
Dependencies are inferred from the claim text.