Integrated Hydrotreating and Isomerization Process with Aromatic Separation

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 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.

主权项

1. A method of processing a hydrocarbon feed to reduce the concentration of undesired organosulfur compounds comprising:
subjecting the hydrocarbon feed to a mild hydrotreating process effective to
convert labile organosulfur compounds andproduce a hydrotreated effluent containing converted compounds and unconverted sterically hindered refractory aromatic organosulfur compounds; separating the hydrotreated effluent into an aromatic-lean fraction that is recovered as a hydrotreated hydrocarbon product and an aromatic-rich fraction that contains sterically hindered refractory aromatic organosulfur compounds; contacting the aromatic-rich fraction with an isomerization catalyst in the presence of hydrogen to remove steric hindrance of certain compounds and produce an isomerized effluent including isomerate and any remaining unreacted hydrogen; and recycling at least a portion of the isomerized effluent to the hydrotreating zone.