Regenerable solid amine sorbent
First Claim
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1. A system for cyclically absorbing and desorbing carbon dioxide and water vapor, said system comprising:
- first and second sorbent beds, each bed containing a supported regenerable amine sorbent comprising from about 35 wt. % to about 75 wt. % amine, said amine selected from the group consisting of primary amines, secondary amines, and mixtures thereof including a plurality of hydoxyl (--OH) groups, and an acrylic ester resin porous support for providing structural integrity to the amine;
a plurality of valves for directing a gas stream into and out of each sorbent bed and for exposing each bed to a pressure gradient;
a thermal conductor for conducting heat between the beds;
a sensor for detecting the concentration of carbon dioxide in each bed; and
a controller responsive to one of the sensor and a predetermined time period for controlling operation of the plurality of valves so that one of the beds is in the absorption cycle while the second bed is in the desorption cycle.
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Abstract
The invention provides a regenerable supported amine sorbent having an amine concentration of from about 35 wt. % to about 75 wt. %. The balance of the sorbent is a porous support which provides the sorbent with structural rigidity and a surface for gas/solid contact. The invention further provides a process for making the sorbent and system for cyclically absorbing and desorbing carbon dioxide using a plurality of sorbent beds.
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18 Claims
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1. A system for cyclically absorbing and desorbing carbon dioxide and water vapor, said system comprising:
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first and second sorbent beds, each bed containing a supported regenerable amine sorbent comprising from about 35 wt. % to about 75 wt. % amine, said amine selected from the group consisting of primary amines, secondary amines, and mixtures thereof including a plurality of hydoxyl (--OH) groups, and an acrylic ester resin porous support for providing structural integrity to the amine; a plurality of valves for directing a gas stream into and out of each sorbent bed and for exposing each bed to a pressure gradient; a thermal conductor for conducting heat between the beds; a sensor for detecting the concentration of carbon dioxide in each bed; and a controller responsive to one of the sensor and a predetermined time period for controlling operation of the plurality of valves so that one of the beds is in the absorption cycle while the second bed is in the desorption cycle.
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- 2. A supported regenerable amine sorbent comprising from about 35 wt. % to about 75 wt. % amine, said amine selected from the group consisting of primary amines, secondary amines, and mixtures thereof including a plurality of hydoxyl (--OH) groups, and an acrylic ester resin porous support for providing the amine with structural integrity and a surface for gas/solid contact.
- 8. A supported regenerable amine sorbent comprising from about 45 wt. % to about 65 wt. % amine selected from the group consisting of diethanolamine (DEA), diisopropanolamine (DIPA), 2-hydoxyethyl piperazine (HEP), and mixtures thereof, the remainder of the sorbent being a porous acrylic ester resin for providing structural integrity to the amine and a surface for gas/solid contact.
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10. A process for making a regenerable supported amine sorbent, said process comprising the steps of:
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forming an amine/solvent solution, said amine selected from the group consisting of primary amines, secondary amines, and mixtures thereof including a plurality of hydoxyl (--OH) groups; mixing an acrylic ester resin porous support material with the amine solution; heating the mixture to both retain the amine on the support and remove the solvent from the mixture, and thereby form the sorbent. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification