CARBON DIOXIDE SORBENTS
First Claim
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1. A functionalized adsorbent material for adsorbing CO2 from CO2-containing gaseous streams, which adsorbent material comprises a mesoporous silica having at least a portion of its pores functionalized with in-situ polymerized cyclic amine in which the density of amine sites of the in-situ polymerized cyclic amine is below 20.0 mmol amine/gram.
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Abstract
Improved CO2 sorbents comprised of a mesoporous silica functionalized with a polyamine are obtained by the in-situ polymerization of azetidine. Also included herein are processes utilizing the improved CO2 sorbents wherein CO2 is chemisorbed onto the polyamine portion of the sorbent and the process is thermally reversible.
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Citations
28 Claims
- 1. A functionalized adsorbent material for adsorbing CO2 from CO2-containing gaseous streams, which adsorbent material comprises a mesoporous silica having at least a portion of its pores functionalized with in-situ polymerized cyclic amine in which the density of amine sites of the in-situ polymerized cyclic amine is below 20.0 mmol amine/gram.
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8. A method of preparing a functionalized adsorbent material comprised of a cyclic amine polymer for removing CO2 from CO2-containing gaseous streams, which method comprises:
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forming a mixture comprised of a cyclic amine, a BrCnsted acid initiator in a solvent, and a mesoporous silica; forming the cyclic amine polymer in the presence of the mesoporous silica; and retrieving the resultant functionalized adsorbent material from the mixture as a solid; wherein the resulting cyclic amine polymer has an amine density of below about 20.0 mmol amine/gram. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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- 16. A method for removing CO2 from a CO2-containing gaseous stream, which method comprises contacting said stream with an effective amount of a functionalized adsorbent material comprising a mesoporous silica material having at least a portion of its pores functionalized with in-situ polymerized cyclic amine in which the density of amine sites of the in-situ polymerized cyclic amine is below 20.0 mmol amine/gram.
- 22. A method for removing CO2 from a CO2-containing gaseous stream, which method comprises contacting said gaseous stream with an effective amount of a liquid phase sorbent comprising an aqueous solution of a polymerized cyclic amine in which the density of amine sites of the polymerized cyclic amine is below about 20.0 mmol amine/gram.
Specification