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US 9,878,285 B2Granted
Method and absorption medium for absorbing CO2 from a gas mixture
AssigneeEvonik Degussa GmbH
InventorsAlexander Schraven, Günter Knaup, Rolf Schneider
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Abstract
The absorption of CO2 from a gas mixture by contacting the gas mixture with an absorption medium that comprises water and 5 to 50 wt % of amino acid salts of formula R1R2CHNHCH2COOK, in which R1 and R2 are n-alkyl radicals and the radicals R1 and R2 together have 2 to 4 carbon atoms, affords a high CO2 absorption capacity per unit weight in the cyclical operation of absorption and desorption.
Claims19
An absorption medium for absorbing CO2 from a gas mixture, comprising water and 5 to 50 wt % of amino acid salts of formula (I):
- R1R2CHNHCH2COOK (I)
- in which R1 and R2 are n-alkyl radicals, and the radicals R1 and R2 together have 2 to 4 carbon atoms;
- which further comprises potassium ions in the form of potassium carbonate or potassium hydrogen carbonate, wherein the molar ratio of potassium ions in the form of potassium carbonate or potassium hydrogen carbonate to amino acid salts of formula I is in the range from 0.01 to 0.1;
- and wherein:
- more than 90 wt % of the amino acid salts of formula (I) are potassium N-isopropylglycinate.
2 more elements
Dependencies are inferred from the claim text.