Treatment of hydrogen/hydrocarbon mixtures on adsorbents regenerated at high pressure
First Claim
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1. A method which may be used for a PSA separation of a gas mixture, wherein said gas mixture comprises hydrogen and impurities which comprise at least one hydrocarbon (CnHm), comprising:
- a) contacting said gas mixture with a first adsorbent, wherein said first adsorbent comprises a silica gel, and a second adsorbent, wherein said second comprises an activated charcoal;
b) adsorbing at least a portion of the impurities of said gas mixture with said first and said second adsorbents;
c) producing hydrogen at a production pressure (P′
);
d) desorbing at least a portion of said impurities from said adsorbents; and
e) producing a waste gas stream, wherein said waste gas stream has a regeneration pressure (P″
) between about 2 bar absolute and about 10 bar absolute and wherein said waste gas stream further comprises said impurities, wherein said regeneration pressure (P″
) is greater than or equal to a pressure of a fuel network of a petrochemical facility on which the PSA unit is installed.
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Abstract
A method of PSA gas separation for a gas mixture containing hydrogen and hydrocarbon impurities. The gas mixture is put in contact with silica gel and activated carbon so as to adsorb the impurities in the gas mixture. Hydrogen rich and waste gas flows are produced. The waste gas flow may be sent to the combustible network of a petrochemical site, without having to make a pressure adjustment to the waste gas.
12 Citations
25 Claims
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1. A method which may be used for a PSA separation of a gas mixture, wherein said gas mixture comprises hydrogen and impurities which comprise at least one hydrocarbon (CnHm), comprising:
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a) contacting said gas mixture with a first adsorbent, wherein said first adsorbent comprises a silica gel, and a second adsorbent, wherein said second comprises an activated charcoal; b) adsorbing at least a portion of the impurities of said gas mixture with said first and said second adsorbents; c) producing hydrogen at a production pressure (P′
);d) desorbing at least a portion of said impurities from said adsorbents; and e) producing a waste gas stream, wherein said waste gas stream has a regeneration pressure (P″
) between about 2 bar absolute and about 10 bar absolute and wherein said waste gas stream further comprises said impurities, wherein said regeneration pressure (P″
) is greater than or equal to a pressure of a fuel network of a petrochemical facility on which the PSA unit is installed. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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4. A method which may be used for a PSA separation of a gas mixture, wherein said gas mixture comprises hydrogen and impurities which comprise at least one hydrocarbon (CnHm), comprising:
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a) contacting said gas mixture with a first adsorbent, wherein said first adsorbent comprises a silica gel, and a second adsorbent, wherein said second comprises an activated charcoal; b) adsorbing at least a portion of the impurities of said gas mixture with said first and said second adsorbents; c) producing hydrogen at a production pressure (P′
);d) desorbing at least a portion of said impurities from said adsorbents; and e) producing a waste gas stream, wherein said waste gas stream has a regeneration pressure (P″
) between about 2 bar absolute and about 10 bar absolute and wherein said waste gas stream further comprises said impurities, further comprising producing said waste gas stream at said regeneration pressure (P″
) in the absence of a compression means, wherein said genreation regeneration pressure (P″
) is greater than or equal to a pressure of a fuel network of a petrochemical facility on which the PSA unit is installed.
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24. A method which may be used for a PSA separation of a gas mixture, wherein said gas mixture comprises hydrogen and impurities which comprise at least one hydrocarbon (CnHm), comprising:
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a) contacting said gas mixture with a first adsorbent, wherein said first adsorbent comprises an adsorbent which adsorbs at least one hydrocarbon (CnHm), and a second adsorbent, wherein said second comprises an activated charcoal; b) adsorbing at least a portion of the impurities of said gas mixture with said first and said second adsorbents; c) producing hydrogen at a production pressure (P′
);d) desorbing at least a portion of said impurities from said adsorbents; and e) producing a waste gas stream, wherein said waste gas stream has a regeneration pressure (P″
) between about 2 bar absolute and about 10 bar absolute and wherein said waste gas stream further comprises said impurities, wherein said regeneration pressure (P″
) is greater than or equal to a pressure of a fuel network of a petrochemical facility on which the PSA unit is installed.
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25. A method which may be used for a PSA separation of a gas mixture, wherein said gas mixture comprises hydrogen and impurities which comprise at least one hydrocarbon (CnHm), comprising:
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a) contacting said gas mixture with an activated alumina adsorbent; b) contacting said gas mixture with a first adsorbent, wherein said first adsorbent comprises a silica gel, and a second adsorbent, wherein said second comprises an activated charcoal; c) adsorbing at least a portion of the impurities of said gas mixture with said first and said second adsorbents; d) producing hydrogen at a production pressure (P′
);e) desorbing at least a portion of said impurities from said adsorbents; f) producing a waste gas stream, wherein said waste gas stream has a regeneration pressure (P″
) above about 3 bar absolute and wherein said waste gas stream further comprises said impurities; andg) sending said waste gas stream to the pipeline network of a fuel network of a petrochemical facility, wherein said pipeline network comprises a gas flowing at a pressure above about 3 bar absolute, wherein said regeneration pressure (P″
) is greater than or equal to the pressure of the pipeline network.
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Specification