Direct capture of CO2 from air and point sources

A method of sorbing CO2, comprising:

• exposing a first gas flow comprising 15 vol % to 25 vol % O2 and 100 vppm to 800 vppm CO2 to one or more amine sorbents in a sorbent environment at a first temperature of 10° C. to 35° C. to form one or more partially loaded amine sorbents comprising a first sorbent loading of CO2 sorbed during the exposing the first gas flow;
• exposing a second gas flow comprising 1.0 vol % to 20 vol % CO2 and a second temperature higher than the first temperature to the one or more partially loaded amine sorbents in the sorbent environment to form one or more additionally loaded amine sorbents comprising a second sorbent loading of CO2 sorbed during the exposing the second gas flow, a ratio of the second sorbent loading to the first sorbent loading being 0.02 or more;
• passing a purge gas flow through the sorbent environment;
• and
• heating the sorbent environment to a temperature of 85° C. or higher to desorb at least a portion of the CO2 from the one or more additionally loaded amine sorbents;
• wherein desorbing at least a portion of the CO2 from the one or more additionally loaded amine sorbents forms one or more regenerated amine sorbents, the method further comprising:
• cooling the sorbent environment to a temperature of less than 90° C. and above the temperature of the first gas flow;
• and
• exposing another portion of the first gas flow to the one or more regenerated amine sorbents;
• wherein a time for the exposing another portion of the first gas flow is greater than a time for the exposing the first gas flow, or wherein a time for the exposing another portion of the first gas flow is less than a time for the exposing the first gas flow.