CO
A solid absorbent for absorption of CO 2 from flue gas, comprising: a) particles made of a cross bounded, highly porous polymer substrate, and b) CO 2 absorbing functional nucleophilic groups grafted on the particle surface, is described. A method for CO 2 sequestration using the absorbent is also described.
1. A method comprising:
removing CO 2 from a gas phase, wherein the gas phase is brought in contact with an aqueous suspension of super-paramagnetic particles made of a cross-bounded, porous polymer substrate, having CO 2 absorbing functional nucleophilic groups grafted on a particle surface, where an absorbent is concentrated by magnetic separation of water and particles, and where the absorbent thereafter is regenerated by heating to release CO 2 that is withdrawn and treated further for export from a plant.
2. The method of claim 1 , wherein the CO 2 absorbing functional groups are amines selected from the group consisting of a primary amine, a secondary amine, a tertiary amine, an aromatic amine, or a cyclic amine and combinations thereof.
3. The method according to claim 1 , wherein the gas phase is brought in contact by countercurrent flow to the aqueous suspension.
4. The method according to claim 1 , wherein the magnetic separation is performed in a rotary separator.