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Mixed amine and non-nucleophilic base CO2 scrubbing process for improved adsorption at increased temperatures

  • US 8,715,397 B2
  • Filed: 09/09/2011
  • Issued: 05/06/2014
  • Est. Priority Date: 09/09/2010
  • Status: Active Grant
First Claim
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1. A cyclic process for separating CO2 from a gas stream, which process comprises:

  • dehumidifying the gas stream to remove substantial quantities of water therefrom;

    contacting the dehumidified gas stream with an absorbent system comprising a non-aqueous aprotic solvent, an amine CO2 sorbent, and a non-nucleophilic base having a pKa at least 3 units higher than that of the amine at a temperature above 50°

    C. to sorb CO2, wherein the contacting of the absorbent system with the dehumidified gas stream results in formation of a stabilized mixed carbamate in which the CO2 forms a carbamate by reaction with the amine sorbent and in which a protonated form of the non-nucleophilic base forms a stabilizing counterion for the carbamate; and

    treating the absorbent system containing the sorbed CO2 under conditions sufficient to cause desorption of at least a portion of the CO2.

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