Desulfurization and isomerization of N-paraffins
AssigneeUnion Oil Company of California
InventorsPeter Kokayeff, Suheil F. Abdo
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Abstract
A hydrocarbon-containing feedstock is desulfurized so as to contain less than 5, and preferably less than 2 ppmw of sulfur, in the first stage of a two-stage process. In the second stage, the feedstock is contacted with an isomerization catalyst useful for promoting n-paraffin isomerization reactions. A dual-function catalyst effective for simultaneously desulfurizing and isomerizing a hydrocarbon oil may be employed in the first stage. Alternatively, the dual-function catalyst may be employed in both the first and second stages. Alternatively still, the dual-function catalyst may be used to treat a feedstock containing n-paraffins in a single stage isomerization process.
Claims50
A process for desulfurizing and catalytically isomerizing a hydrocarbon feedstock containing sulfur components and normal paraffin compounds, said process comprising successively contacting a catalytic absorbent under desulfurization conditions with said feedstock in a first reaction zone to absorb said sulfur components and, subsequently contacting the effluent from said first reaction zone with an isomerizaton catalyst comprising a crystalline molecular sieve under isomerization conditions in a second reaction zone to produce a hydrocarbon product containing a reduced amount of said normal paraffin compounds, said effluent from said first reaction zone containing less than 5 ppmw of said sulfur components, calculated as S, and said isomerization conditions comprise a temperature from about 50.degree. F. to about 600.degree. F.
A process for desulfurizing and isomerizing a hydrocarbon feedstock containing sulfur components, normal hexane or normal pentane, said process comprising successively absorbing sulfur components from said feedstock on a catalytic absorbent to produce an effluent containing less than about 2 ppmw of said sulfur, calculated as S, and subsequently contacting said effluent with a hydroisomerization catalyst under hydroisomerization conditions which produce a hydrocarbon product containing a reduced amount of said normal hexane or normal pentane, said hydroisomerization catalyst comprising a crystalline molecular sieve and said hydroisomerization conditions comprising a temperature from about 450.degree. F. to about 575.degree. F., a pressure from about 200 p.s.i.g. to about 350 p.s.i.g., and the presence of hydrogen.
A process for simultaneously desulfurizing and catalytically isomerizing a hydrocarbon feedstock containing organosulfur components and normal paraffin compounds, said process comprising contacting said feedstock with a dual-function catalyst capable of simultaneously absorbing said organosulfur components and isomerizing said feedstock and comprising at least one metal component in combination with an acidic component under conditions for simultaneously absorbing said organosulfur components and isomerizing said feedstock and which produce a hydrocarbon product containing a reduced concentration of said normal paraffin compounds and a reduced concentration of said organosulfur components.
A process for simultaneously desulfurizing and catalytically isomerizing a hydrocarbon feedstock containing organosulfur components and normal paraffin compounds, said process comprising contacting said feedstock with a dual-function catalyst capable of simultaneously absorbing said organosulfur components and isomerizing said feedstock and consisting essentially of nickel metal components in combination with a zeolitic crystalline molecular sieve or a nonzeolitic crystalline molecular sieve under conditions for simutaneously absorbing said organosulfur components and isomerizing or hydroisomerizing said feedstock to produce a hydrocarbon product of reduced content of said normal paraffin compounds and a sulfur content less than about 2 ppmw, calculated as S.
Dependencies are inferred from the claim text.