Patent ID: 6599417
Filing Date: 2003-07-29
Classification: C10G

Abstract:
A process for producing products of reduced sulfur content from a feedstock, wherein said feedstock contains sulfur-containing organic impurities and basic nitrogen-containing impurities and is comprised of a normally liquid mixture of hydrocarbons which includes olefins, said process comprising:(a) removing at least a portion of the basic nitrogen-containing impurities from the feedstock; (b) contacting the feedstock with an olefin-modification catalyst in an olefin-modification reaction zone under conditions which are effective to produce a product which has a lower bromine number than that of the feedstock; wherein said olefin modification catalysts is selected from the group consisting of solid phosphoric acid catalysts and acidic polymeric resin catalysts; (c) fractionating the product from said olefin-modification reaction zone to produce; (i) a first fraction which contains sulfur-containing organic impurities and has a distillation endpoint which is in the range from about 135Â° C. to about 221Â° C.; and (ii) a second fraction which is higher boiling than the first fraction and contains sulfur-containing organic impurities; and (d) contacting said first fraction with a hydrodesulfurization catalyst in the presence of hydrogen in a first hydrodesulfurization reaction zone under conditions which are effective to convert at least a portion of the sulfur in said sulfur-containing impurities of the first fraction to hydrogen sulfide.