AMINO SORBENTS FOR CAPTURING OF CO2 FROM GAS STREAMS

A method for separating gaseous carbon dioxide from a gas mixture, preferably from at least one of ambient atmospheric air (1), flue gas and biogas, by cyclic adsorption/desorption using a sorbent material (3), wherein the method comprises at least the following sequential and in this sequence repeating steps (a)-(e):(a) contacting said gas mixture (1) with the sorbent material (3) to allow gaseous carbon dioxide to adsorb;(b) isolating said sorbent material (3) from said flow-through;(c) inducing an increase of the temperature of the sorbent material (3);(d) extracting at least the desorbed gaseous carbon dioxide from the unit (8) and separating gaseous carbon dioxide from steam in or downstream of the unit (8);(e) bringing the sorbent material (3) to ambient atmospheric conditions;wherein said sorbent material (3) comprises primary and/or secondary amine moieties immobilized on a solid support, wherein the amine moieties, in the α-carbon position, are substituted by one hydrogen and one non-hydrogen substituent (R).