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) passing the product stream through a gas/gas exchanger;
c) passing at least a portion of the product stream to the demethanizer to separate the at least a portion of the product stream into a final product stream and a demethanizer overhead stream;
d) passing at least a portion of the demethanizer overhead stream through the gas/gas exchanger to lower the temperature of the product stream;
e) performing one or more depressurization steps, wherein the pressure of the adsorbent bed unit is reduced by a predetermined amount with each successive depressurization step;
f) 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;
g) performing one or more re-pressurization steps, wherein the pressure within the adsorbent bed unit is increased with each re-pressurization step by a predetermined amount with each successive re-pressurization step; and
repeating the steps a) and e) to g) 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 PPSA dehydration system with a cryogenic recovery system.
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Citations
26 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) passing the product stream through a gas/gas exchanger; c) passing at least a portion of the product stream to the demethanizer to separate the at least a portion of the product stream into a final product stream and a demethanizer overhead stream; d) passing at least a portion of the demethanizer overhead stream through the gas/gas exchanger to lower the temperature of the product stream; e) performing one or more depressurization steps, wherein the pressure of the adsorbent bed unit is reduced by a predetermined amount with each successive depressurization step; f) 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; g) performing one or more re-pressurization steps, wherein the pressure within the adsorbent bed unit is increased with each re-pressurization step by a predetermined amount with each successive re-pressurization step; and repeating the steps a) and e) to g) 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)
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20. 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; 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; 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 a portion of the demethanizer overhead stream to produce an exchanger output stream; and wherein a purge stream is passed through the each of the one or more adsorbent bed units and comprises at least a portion of the demethanizer overhead stream. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification