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 - 9 . (canceled) 
     
     
         10 . A method for separating CO2 from a CO2 containing gas, where the CO 2  is captured by countercurrent flow to an absorbent in an absorber to give a CO 2  lean flue gas that is released into the surroundings, and a CO 2  rich absorbent that is regenerated in a regeneration column, by adding heat, to give a CO 2  rich gas that is treated further, and regenerated CO2 lean absorbent that is recycled to the absorber for reuse, wherein the circulating CO2 absorbent is an aqueous CO2 absorbent comprising:
 2-amino-2-methyl-1-propanol (AMP); and   one of:
 3-aminopropanol (AP); and 
 4-aminobutanol (AB). 
   
     
     
         11 . The method according to  claim 10 , 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. 
     
     
         12 . The method according to  claim 10 , wherein the concentration of AMP is from 20 to 35% by weight. 
     
     
         13 . The method according to  claim 10 , wherein the concentration of AMP is from 25 to 35% by weight. 
     
     
         14 . The method according to  claim 10 , wherein the concentration of AMP is from 30 to 35% by weight. 
     
     
         15 . The method according to  claim 10 , wherein the concentration of AP or AB is from 20 to 40% by weight. 
     
     
         16 . The method according to  claim 10 , wherein the concentration of AP or AB is from 25 to 40% by weight. 
     
     
         17 . The method according to  claim 10 , wherein the concentration of AP or AB is from 30 to 40% by weight. 
     
     
         18 . The method according to  claim 10 , wherein the absorbent comprises a combination of AMP and AP. 
     
     
         19 . The method according to  claim 18 , wherein the concentration of AMP is from 10 to 35% by weight and the concentration of AP is from 10 to 40% by weight. 
     
     
         20 . The method according to  claim 18 , wherein the concentration of AMP is from 20 to 35% by weight. 
     
     
         21 . The method according to  claim 18 , wherein the concentration of AMP is from 25 to 35% by weight. 
     
     
         22 . The method according to  claim 18 , wherein the concentration of AMP is from 30 to 35% by weight. 
     
     
         23 . The method according to  claim 18 , wherein the concentration of AP is from 20 to 40% by weight. 
     
     
         24 . The method according to  claim 18 , wherein the concentration of AP is from 25 to 40% by weight. 
     
     
         25 . The method according to  claim 18 , wherein the concentration of AP is from 30 to 40% by weight. 
     
     
         26 . The method according to  claim 10 , wherein the CO2 containing gas is brought in countercurrent flow to the 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. 
     
     
         27 . The method according to  claim 10 , wherein the CO2 containing gas is an exhaust gas from a thermal power plant or an industrial plant.