Application of amine-tethered solid sorbents to CO2 fixation from air
First Claim
1. A method for the capture of C02 from dilute gas streams in a cyclical manner, the concentration of CO2 in the gas stream being in the range of from 1-1000 ppm;
- the process comprising passing the dilute-C02 gas stream over a solid adsorbent at a substantially ambient temperature of not greater than 120°
C., the solid adsorbent comprising an amine adsorbent tethered to a substrate, the tethered amine being selected from the group consisting of hyperbranched aminopolymers tethered to a substrate selected from the group consisting of a metal oxide, a porous silica and a porous hydrocarbon-based solid polymer support structure, wherein the amine is tethered to the substrate by covalent bonds; and
a tethered amine prepared by the reaction of a silyl amine with an oxide substrate; and
regenerating the solid adsorbent at a temperature of not substantially greater than about 120°
C., to obtain a substantially concentrated CO2 gas stream and a regenerated adsorbent; and
repeating the cycle.
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Abstract
A method for capturing CO2 from the ambient air by the use of solid tethered amine adsorbents, where the amine adsorbents are tethered to a substrate selected from the group of silica, metal oxides and polymer resins. The tethered amines are joined to the substrate by covalent bonding, achieved either by the ring-opening polymerization of aziridine on porous and non-porous supports, or by the reaction of mono-, di-, or tri-aminosilanes, with silica or a metal oxide having hydroxyl surface groups. The method includes the adsorption of CO2 from ambient air, the regeneration of the adsorbent at elevated temperatures not above 120° C. and the separation of purified CO2, followed by recycling of the regenerated tethered adsorbent for further adsorption of CO2 from the ambient atmosphere.
44 Citations
18 Claims
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1. A method for the capture of C02 from dilute gas streams in a cyclical manner, the concentration of CO2 in the gas stream being in the range of from 1-1000 ppm;
- the process comprising passing the dilute-C02 gas stream over a solid adsorbent at a substantially ambient temperature of not greater than 120°
C., the solid adsorbent comprising an amine adsorbent tethered to a substrate, the tethered amine being selected from the group consisting of hyperbranched aminopolymers tethered to a substrate selected from the group consisting of a metal oxide, a porous silica and a porous hydrocarbon-based solid polymer support structure, wherein the amine is tethered to the substrate by covalent bonds; and
a tethered amine prepared by the reaction of a silyl amine with an oxide substrate; and
regenerating the solid adsorbent at a temperature of not substantially greater than about 120°
C., to obtain a substantially concentrated CO2 gas stream and a regenerated adsorbent; and
repeating the cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- the process comprising passing the dilute-C02 gas stream over a solid adsorbent at a substantially ambient temperature of not greater than 120°
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14. A cyclic process for the adsorption and capture of CO2 from ambient air, the process comprising cyclically passing air at ambient conditions through a bed of porous, solid material comprising an oxide substrate-based tethered amine adsorbent, to adsorb the CO2 from the air and form a CO2 loaded adsorbent, the adsorbent comprising a tethered amine derived from the group consisting of hyperbranched aminopolymers and a silylamine prepared by the reaction of a silyl diamine with an oxide substrate;
- regenerating the tethered amine, by separating the CO2 from the adsorbent, at a temperature of not greater than 120°
C. to form regenerated adsorbent and purified CO2; and
capturing the purified CO2; and
repeating the adsorption-regeneration process cycle. - View Dependent Claims (15, 16, 17, 18)
- regenerating the tethered amine, by separating the CO2 from the adsorbent, at a temperature of not greater than 120°
Specification