An aqueous co2 absorbent comprising 2-amino-2-methyl-1-propanol and 3-aminopropanol or 2-amino-2-methyl-1-propanol and 4-aminobutanol

Abstract

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.