AN AQUEOUS CO2 ABSORBENT COMPRISING 2-AMINO-2-METHYL-1-PROPANOL AND 3-AMINOPROPANOL OR 2-AMINO-2-METHYL-1-PROPANOL AND 4-AMINOBUTANOL
An aqueous CO2 absorbent comprising a combination of 2-amino-2-methyl-1-propanol (AMP) and 3-aminopropanol (AP), or AMP and 4-aminobutanol (AB), is described. A method for capturing CO2 from a CO2 containing gas using the mentioned absorbent, and the use of a combination of AMP and AP, or a combination of AMP and AB are also described.
1 . An aqueous CO2 absorbent comprising:
2-amino-2-methyl-1-propanol (AMP); and
one of:
3-aminopropanol (AP); and
4 aminobutanol (AB).
2 . The aqueous CO2 absorbent according to claim 1 , wherein the concentration of AMP is from 10 to 35% by weight and the concentration of AP or AB is from 10 to 40% by weight.
3 . The aqueous CO2 absorbent according to claim 2 , wherein the concentration of AMP is at least 10% by weight.
4 . The aqueous CO2 absorbent according to claim 2 , wherein the concentration of AP or AB is at least 10% by weight.
5 . The aqueous CO2 absorbent according to claim 1 , wherein the absorbent additionally comprises any conventional additive.
6 . The aqueous CO2 absorbent according to claim 1 , wherein the absorbent comprises a combination of AMP and AP.
7 . A method for capturing CO2 from a CO2 containing gas, where the CO2 containing gas is brought in countercurrent flow to a CO2 absorbent in an absorber to give a CO2 depleted gas that is released into the surroundings, and a CO2 rich absorbent that is collected in the bottom of the absorber, regenerated and recycled into the absorber, wherein the CO2 absorbent is an aqueous CO2 absorbent comprising a combination of 2-amino-2-methyl-1-propanol (AMP) and 3-aminopropanol (AP), or AMP and 4-aminobutanol (AB).
8 . (canceled)
9 . (canceled)
10 . The aqueous CO2 absorbent according to claim 3 , wherein the concentration of AMP is at least 20% by weight.
11 . The aqueous CO2 absorbent according to claim 10 , wherein the concentration of AMP is at least 25% by weight.
12 . The aqueous CO2 absorbent according to claim 11 , wherein the concentration of AMP is at least 30% by weight.
13 . The aqueous CO2 absorbent according to claim 4 , wherein the concentration of AP or AB is at least 20% by weight.
14 . The aqueous CO2 absorbent according to claim 13 , wherein the concentration of AP or AB is at least 25% by weight.
15 . The aqueous CO2 absorbent according to claim 14 , wherein the concentration of AP or AB is at least 30% by weight.
16 . The method for capturing CO2 from a CO2 containing gas, wherein the CO2 containing gas is an exhaust gas from a thermal power plant or an industrial plant.