INTEGRATED DESULFURIZATION AND DENITRIFICATION PROCESS INCLUDING MILD HYDROTREATING OF AROMATIC-LEAN FRACTION AND OXIDATION OF AROMATIC-RICH FRACTION

摘要

Deep desulfurization of hydrocarbon feeds containing undesired organosulfur and organonitrogen compounds to produce a hydrocarbon product having low levels of sulfur-containing and nitrogen-containing compounds, is achieved by first subjecting the entire feed to an extraction zone to separate an aromatic-rich fraction containing a substantial amount of the refractory organosulfur and organonitrogen compounds and an aromatic-lean fraction containing a substantial amount of the labile organosulfur and organonitrogen compounds. The aromatic-lean fraction is contacted with a hydrotreating catalyst in a hydrotreating reaction zone operating under mild conditions to convert the labile organosulfur and organonitrogen compounds. The aromatic-rich fraction is oxidized to convert the refractory organosulfur and organonitrogen compounds to oxidized organosulfur and organonitrogen compounds. These oxidized organosulfur and organonitrogen compounds are subsequently removed, producing a stream containing reduced levels of organosulfur and organonitrogen compounds.

主权项

1. A method of processing a hydrocarbon feed to remove undesired aromatic and non-aromatic organosulfur compounds comprising:
subjecting the hydrocarbon feed and an effective quantity of extraction solvent to an extraction zone to produce
an extract containing a major proportion of the aromatic content of the hydrocarbon feed and a portion of the extraction solvent anda raffinate containing a major proportion of the non-aromatic content of the hydrocarbon feed and a portion of the extraction solvent; separating at least substantial portion of the extraction solvent from the raffinate and retaining an aromatic-lean fraction; separating at least substantial portion of the extraction solvent from the extract and retaining an aromatic-rich fraction; subjecting the aromatic-lean fraction to a hydrotreating process to thereby reduce the sulfur content; and contacting the aromatic-rich fraction with an oxidizing agent and an oxidizing catalyst to convert aromatic organosulfur compounds to oxides;