Amine absorbent and a method for co2 capture
AssigneeAker Engineering & Technology AS
InventorsHallvard F. Svendsen, Anastasia A. Trollebø
Life of this patent
Estimating the term…
Abstract
A liquid, aqueous CO2 absorbent comprising two or more amine compounds, where the aqueous solution of amines having absorbed CO2 is not, or only partly miscible with an aqueous solution of amines not having absorbed CO2, where at least one of the amines is a tertiary amine, and where at least one of the amines is a primary and/or a secondary amine, wherein the tertiary amine is DEEA and the primary and/or secondary amine(s) is (are) selected from DAB, DAP, DiAP, DMPDA, HEP, or the tertiary amine is DIPAE, or N-TBDEA and primary and/or secondary amine(s) is (are) selected from DAB, DAP, DiAP, DMPDA, HEP, MAPA, and MEA, and a method for CO2 capture using the CO2 absorbent, are described.
Claims8
A liquid, aqueous C02 absorbent comprising:
- two or more amine compounds, where a first aqueous solution of amines having absorbed C02 is not, or only partly miscible with a second aqueous solution of amines not having absorbed C02;
- wherein at least one of the amines is a tertiary amine;
- where wherein at least one of the amines is a primary and/or a secondary amine;
- wherein the tertiary amine is DEEA and the primary and/or secondary amine(s) is (are) selected from DAB, DAP, DiAP, DMPDA, HEP, or the tertiary amine is DIPAE, or N-TBDEA and primary and/or secondary amine(s) is (are) selected from DAB, DAP, DiAP, DMPDA, HEP, MAPA, and MEA.
A method for capturing C02 from a C02 rich gas, the method comprising:
- introducing the C02 rich gas into an absorber in which the C02 rich gas is brought into counter current contact with a liquid, aqueous C02 absorbent comprising a combination of a tertiary amine and a primary or secondary amine, where the tertiary amine is DEEA and the primary and/or secondary amine(s) is (are) selected from DAB, DAP, DiAP, DMPDA, HEP, or the tertiary amine is DIPAE, or N-TBDA and primary and/or secondary amine(s) is (are) selected from DAB, DAP, DiAP, DMPDA, HEP, MAPA, and MEA, to absorb the C02 in the gas stream to produce a depleted gas stream, releasing the gas stream depleted from C02 into the surroundings,
- collecting the liquid, aqueous C02 absorbent at the bottom of the absorber,
- allowing the liquid, aqueous C02 absorbent separate into a C02 rich absorbent phase, and a C02 lean absorbent phase:
- withdrawing the C02 lean absorbent phase and recycling the lean absorbent phase into the absorber,
- withdrawing the C02 rich absorbent phase and introducing the C02 rich absorbent into a stripper column for regeneration of the C02 rich absorbent to release C02, that is withdrawn and further treated for storage, to give the C02 lean absorbent that is recycled to the absorber.
Dependencies are inferred from the claim text.