Patent ID: 8491705
Filing Date: 2013-07-23
Classification: B01D,B01J,Y02A,Y02C

Abstract:
1. A method for the capture of C02 from dilute gas streams in a cyclical manner, the concentration of CO 2 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.