Apparatus and system for swing adsorption processes related thereto
First Claim
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1. A cyclical swing adsorption process for removing contaminants from a gaseous feed stream, the process comprising:
- a) performing one or more adsorption steps, wherein each of the adsorption steps comprises passing a gaseous feed stream at a feed pressure and feed temperature through an adsorbent bed unit to remove one or more contaminants from the gaseous feed stream and to form a product stream that is passed to a cryogenic recovery system including a demethanizer;
b) performing one or more purge steps, wherein each of the purge steps comprises passing a purge stream through the adsorbent bed unit in a counter flow direction relative to the flow of the gaseous feed stream to form a purge product stream, wherein the purge stream comprises at least a portion of a demethanizer overhead stream from the demethanizer, wherein the purge pressure is between 40%+/−
of the feed pressure;
c) performing one or more blowdown steps, wherein each of the blowdown steps comprises passing a blowdown outlet stream from the adsorbent bed unit to the feed stream, wherein the one or more blowdown steps reduce the pressure within the adsorbent bed unit by a predetermined amount to the feed pressure; and
d) repeating the steps a) to c) for at least one additional cycle.
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Abstract
Provided are apparatus and systems for performing a swing adsorption process. This swing adsorption process may involve passing streams through adsorbent bed units to remove contaminants, such as water, from the stream. As part of the process, the adsorbent bed unit is purged with a purge stream that is provided from the overhead of the demethanizer. The configuration integrates a RCTSA dehydration system with a cryogenic recovery system.
392 Citations
29 Claims
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1. A cyclical swing adsorption process for removing contaminants from a gaseous feed stream, the process comprising:
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a) performing one or more adsorption steps, wherein each of the adsorption steps comprises passing a gaseous feed stream at a feed pressure and feed temperature through an adsorbent bed unit to remove one or more contaminants from the gaseous feed stream and to form a product stream that is passed to a cryogenic recovery system including a demethanizer; b) performing one or more purge steps, wherein each of the purge steps comprises passing a purge stream through the adsorbent bed unit in a counter flow direction relative to the flow of the gaseous feed stream to form a purge product stream, wherein the purge stream comprises at least a portion of a demethanizer overhead stream from the demethanizer, wherein the purge pressure is between 40%+/−
of the feed pressure;c) performing one or more blowdown steps, wherein each of the blowdown steps comprises passing a blowdown outlet stream from the adsorbent bed unit to the feed stream, wherein the one or more blowdown steps reduce the pressure within the adsorbent bed unit by a predetermined amount to the feed pressure; and d) repeating the steps a) to c) for at least one additional cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system for removing contaminants from a gaseous feed stream, the system comprising:
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one or more adsorbent bed units, wherein each of the one or more adsorbent bed units is configured to separate contaminants from a gaseous feed stream and to output a product stream, wherein the gaseous feed stream is provided at a feed temperature and a feed pressure; a cryogenic recovery system configured to receive the product stream and pass at least a portion of the product stream to a demethanizer to separate the at least a portion of the product stream into a final product stream and a demethanizer overhead stream, wherein the cryogenic recovery system comprises a gas/gas exchanger unit configured to receive the product stream from the adsorbent bed unit and to lower the temperature of the product stream by heat exchange with the at least portion of the demethanizer overhead stream to produce an exchanger output stream; and wherein a purge stream is configured to be passed through the each of the one or more adsorbent bed units and comprises at least portion of the demethanizer overhead stream, wherein the purge pressure is between 40%+/−
of the feed pressure. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification