TARGETED DESULFURIZATION APPARATUS INTEGRATING OXIDATIVE DESULFURIZATION AND HYDRODESULFURIZATION TO PRODUCE DIESEL FUEL HAVING AN ULTRA-LOW LEVEL OF ORGANOSULFUR COMPOUNDS

摘要

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 flashing the feed at a target cut point temperature to obtain two fractions. A first fraction contains refractory organosulfur compounds, which boil at or above the target cut point temperature. A second fraction boiling below the target cut point temperature is substantially free of refractory sulfur-containing compounds. The second fraction is contacted with a hydrodesulfurization catalyst in a hydrodesulfurization reaction zone operating under mild conditions to reduce the quantity of organosulfur compounds to an ultra-low level. The first fraction is contacted with an oxidizing agent and an active metal catalyst in an oxidation reaction zone to convert the refractory organosulfur compounds to oxidized organosulfur compounds. The oxidized organosulfur compounds are removed, producing a stream containing an ultra-low level of organosulfur compounds. The two streams can be combined to obtain a full range hydrocarbon product having an ultra-low level of organosulfur compounds.

主权项

1. An apparatus for processing a hydrocarbon feed containing undesired organosulfur compounds comprising:
a flashing column operable to flash the hydrocarbon feed at a temperature cut point of about 320° C. to about 360° C., the flashing column including
an inlet for receiving the hydrocarbon feed,a low boiling temperature outlet for discharging a low boiling temperature fraction containing labile organosulfur compounds, anda high boiling temperature outlet for discharging a high boiling temperature fraction containing refractory organosulfur compounds; a hydrodesulfurization zone having an inlet in fluid communication with the low boiling temperature outlet and an outlet for discharging hydrotreated effluent; and an oxidative desulfurization zone containing an oxidation catalyst and an oxidizing agent, oxidative desulfurization zone having an inlet in fluid communication with the high boiling temperature outlet and an outlet for discharging oxidized effluent; and a solvent extraction zone having a product inlet in fluid communication with the outlet for discharging oxidized effluent, a solvent inlet in fluid communication with a source of polar solvent, an extract outlet for discharging a mixture of solvent and oxidized sulfur-containing compounds, and a raffinate outlet for discharging a solvent extracted hydrocarbon product stream.