DEEP DESULFURIZATION PROCESS
First Claim
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1. A process comprising the steps of:
- a) contacting a hydrocarbon feed stream, which comprises heteroatom containing compounds, in a first adsorption zone with a first adsorbent comprising at least one transition metal and at least one inorganic oxide at a first pressure and a first temperature, in the absence of any substantial amounts of added hydrogen, to form a first effluent wherein the first effluent has a heteroatom content lower than the heteroatom content of the hydrocarbon feedstream and;
b) contacting at least a portion of the first effluent, in a second adsorption zone, with a second adsorbent comprising an amorphous inorganic oxide, a porous carbonaceous material, or combinations thereof, at a second reaction pressure and a second reaction temperature, in the absence of any substantial amounts of added hydrogen, to form a second effluent, wherein the second effluent has a heteroatom content lower than the heteroatom content of the first effluent.
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Abstract
Methods for producing a substantially desulfurized hydrocarbon fuel stream, using no substantial amount of hydrogen, at pressures less than 125 psig are described. The process uses two fixed beds in series to remove sulfur and/or other heteroatoms to produce a substantially desulfurized (less than 1 ppm sulfur) hydrocarbon fuel stream. The first fixed bed uses a transition metal catalyst dispersed on an inorganic oxide matrix and the second bed uses a high surface area, porous, amorphous inorganic oxide catalyst or a high surface area porous carbonaceous catalyst. The second fixed bed can additionally comprise one or more metals.
30 Citations
19 Claims
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1. A process comprising the steps of:
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a) contacting a hydrocarbon feed stream, which comprises heteroatom containing compounds, in a first adsorption zone with a first adsorbent comprising at least one transition metal and at least one inorganic oxide at a first pressure and a first temperature, in the absence of any substantial amounts of added hydrogen, to form a first effluent wherein the first effluent has a heteroatom content lower than the heteroatom content of the hydrocarbon feedstream and; b) contacting at least a portion of the first effluent, in a second adsorption zone, with a second adsorbent comprising an amorphous inorganic oxide, a porous carbonaceous material, or combinations thereof, at a second reaction pressure and a second reaction temperature, in the absence of any substantial amounts of added hydrogen, to form a second effluent, wherein the second effluent has a heteroatom content lower than the heteroatom content of the first effluent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for desulfurizing a hydrocarbon feedstream in continuous adsorption mode in the absence of any substantial amount of added hydrogen comprising the steps of:
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(a) contacting a hydrocarbon feed stream, which comprises heteroatom containing compounds, in a first adsorption zone wherein the first adsorption zone comprises at least two adsorption beds in parallel, in the absence of any substantial amounts of added hydrogen, to form a first effluent wherein the first effluent has a heteroatom content lower than the heteroatom content of the hydrocarbon feedstream and; (b) contacting at least a portion of the first effluent, in a second adsorption zone, wherein the second adsorption zone comprises at least 2 adsorption beds in parallel, at a second reaction pressure and a second reaction temperature, in the absence of any substantial amounts of added hydrogen, to form a second effluent, wherein the second effluent has a heteroatom content lower than the heteroatom content of the first effluent. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification