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AssigneeCatalytic Distillation Technologies
InventorsGary G. Podrebarac, Willibrord A. Groten, Manoj Som, Martinus J. Almering
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A light cracked naphtha is treated to convert mercaptans to sulfides and saturate dienes and then subjected to destructive hydrodesulfurization (HDS) to convert the organic sulfur compounds to hydrogen sulfide. The recombinant mercaptans formed by reaction of hydrogen sulfide and olefins at the outlet of the HDS are generally heavier than the light cracked naphtha is fractionated in admixture with a heavy cracked naphtha. A low sulfur content light cracked naphtha is produced as an overheads and the major portion of the mercaptans leave with heavy cracked naphtha as bottoms. It also advantageous to pass the heavy cracked naphtha through the HDS in admixture with the light cracked naphtha, since the recombinant mercaptans formed with the heavy cracked naphtha olefins (which displace some of the lower mercaptans which would form the light cracked naphtha olefins) will be even higher boiling and easier to separate by fractionation.
A process for the removal of organic sulfur compounds comprising mercaptans from LCN, which comprises feeding LCN containing a first amount of organic sulfur compounds comprising mercaptans to a fractionation zone in admixture with a petroleum fraction having a boiling range higher than LCN and fractionating said admixture under conditions of temperature and pressure to remove a bottoms fraction comprising said petroleum fraction and a portion of the organic sulfur compounds from the LCN and an overheads comprising LCN and a lesser amount of the organic sulfur compounds than that fed to the fractionation zone.
A process for removal of sulfur compounds to low levels while minimizing loss of octane comprising hydrotreating an LCN having a first organic sulfur compound contentto convert a portion of said organic sulfurcompounds to H2S and the corresponding olefins and alkanes, removing the H2S, recovering said LCN having a second organic sulfur compound content, fractionating said LCN in admixture with an HCN under conditions of temperature and pressure to provide an overheads comprising LCN having a third organic compound sulfur content lower than said second organic compound content and a bottoms comprising HCN.
In a process for the hydrodesulfurization of a light cracked naphtha stream containing organic sulfur compounds and olefins comprising passing the light cracked naphtha stream over a bed of hydrodesulfurization catalyst in a hydrodesulfurization reactor to react of a portion of the organic sulfur compounds within the light cracked naphtha stream with hydrogen to form hydrogen sulfide and wherein a portion of the hydrogen sulfide produced reacts with a portion of the olefins to produce recombinant mercaptans, the improvement comprising fractionating the effluent from the reactor in admixture with a heavy cracked naphtha stream to remove a heavy stream containing the recombinant mercaptans.
A process for the hydrodesulfurization of a light cracked naphtha stream containing mercaptans, thiophenes, olefins and diolefins comprising:
A process for the hydrodesulfurization of a light cracked naphtha stream containing mercaptans, thiophenes, olefins and diolefins comprising:
Dependencies are inferred from the claim text.