Method of enhancing an aromatization catalyst
First Claim
1. A hydrocarbon aromatization process comprising:
- adding a nitrogenate to a hydrocarbon stream to produce an enhanced hydrocarbon stream, wherein the hydrocarbon stream is substantially free of sulfur and wherein the nitrogenate comprises ammonia or one or more ammonia precursors that form ammonia in the reaction zone;
contacting the enhanced hydrocarbon stream with an aromatization catalyst in a reaction zone, wherein the aromatization catalyst comprises a non-acidic L-zeolite support, platinum, and one or more halides; and
recovering an effluent comprising aromatic hydrocarbons.
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Abstract
A hydrocarbon aromatization process comprising adding a nitrogenate, an oxygenate, or both to a hydrocarbon stream to produce an enhanced hydrocarbon stream, and contacting the enhanced hydrocarbon stream with an aromatization catalyst, thereby producing an aromatization reactor effluent comprising aromatic hydrocarbons, wherein the catalyst comprises a non-acidic zeolite support, a group VIII metal, and one or more halides. Also disclosed is a hydrocarbon aromatization process comprising monitoring the presence of an oxygenate, a nitrogenate, or both in an aromatization reactor, monitoring at least one process parameter that indicates the activity of the aromatization catalyst, modifying the amount of the oxygenate, the nitrogenate, or both in the aromatization reactor, thereby affecting the parameter.
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Citations
34 Claims
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1. A hydrocarbon aromatization process comprising:
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adding a nitrogenate to a hydrocarbon stream to produce an enhanced hydrocarbon stream, wherein the hydrocarbon stream is substantially free of sulfur and wherein the nitrogenate comprises ammonia or one or more ammonia precursors that form ammonia in the reaction zone; contacting the enhanced hydrocarbon stream with an aromatization catalyst in a reaction zone, wherein the aromatization catalyst comprises a non-acidic L-zeolite support, platinum, and one or more halides; and recovering an effluent comprising aromatic hydrocarbons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A hydrocarbon aromatization process comprising:
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adding a nitrogenate to a hydrocarbon stream to produce an enhanced hydrocarbon stream, to a hydrogen recycle stream to produce an enhanced recycle stream, or to both, wherein the hydrocarbon stream is substantially free of sulfur and wherein the nitrogenate comprises ammonia or one or more ammonia precursors that form ammonia in the reaction zone; contacting the enhanced recycle stream, alone or in combination with the enhanced hydrocarbon stream with an aromatization catalyst, wherein the aromatization catalyst comprises a non-acidic L-zeolite support, platinum, and one or more halides; recovering an effluent comprising aromatic hydrocarbons; and controlling the addition of the nitrogenate to the hydrocarbon stream, the recycle stream, or both in order to maintain one or more process parameters within a desired range, wherein the nitrogenate is controlled to maintain a Teq across one or more reactors in the process, wherein the Teq in the one or more reactors is decreased in comparison to a Teq that occurs in the absence of the nitrogenate. - View Dependent Claims (13, 14)
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15. A hydrocarbon aromatization process comprising:
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monitoring the presence of a nitrogenate in the aromatization process; monitoring at least one parameter of the aromatization process that indicates the activity of an aromatization catalyst, wherein the aromatization catalyst comprises a non-acidic L-zeolite support, platinum, and one or more halides; and modifying the amount of the nitrogenate in the aromatization process, thereby affecting the parameter, wherein the modification comprises increasing an amount of the nitrogenate added in the aromatization process to a first level, then decreasing the amount of the nitrogenate added in the aromatization process to a second level, wherein the nitrogenate is added to a hydrocarbon stream is substantially free of sulfur, and wherein the nitrogenate comprises ammonia or one or more ammonia precursors that form ammonia in the reaction zone. - View Dependent Claims (16, 17, 18)
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19. A hydrocarbon aromatization process comprising:
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adding a nitrogenate to a recycle stream to produce an enhanced recycle stream, wherein the nitrogenate comprises ammonia or one or more ammonia precursors that form ammonia in the reaction zone; contacting the enhanced recycle stream and a hydrocarbon stream with an aromatization catalyst in a reaction zone, wherein the hydrocarbon stream is substantially free of sulfur, wherein the catalyst comprises a non-acidic L-zeolite support, platinum, and one or more halides; and recovering an effluent comprising aromatic hydrocarbons. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A hydrocarbon aromatization process comprising:
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adding a nitrogenate to a hydrocarbon stream to produce an enhanced hydrocarbon stream, to a recycle stream to produce an enhanced recycle stream, or to both, wherein the hydrocarbon stream is substantially free of sulfur and wherein the nitrogenate comprises ammonia or one or more ammonia precursors that form ammonia in the reaction zone; contacting the enhanced hydrocarbon stream or the enhanced recycle stream with an aromatization catalyst, wherein the aromatization catalyst comprises a non-acidic L-zeolite support, platinum, and one or more halides; recovering an effluent comprising aromatic hydrocarbons; and
increasing an amount of the nitrogenate added to the hydrocarbon stream or to the recycle stream.
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Specification