Carbon dioxide absorbent and method for absorbing and desorbing carbon dioxide
AssigneesResearch Institute of Nanjing Chemical Ind. Group, China Petroleum & Chemical Corporation
InventorsSongbai MAO, Zhongbin HUANG
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Abstract
A carbon dioxide absorbent is disclosed. The absorbent comprises organic amine, amino acid, and water, wherein said organic amine comprises tertiary amine and primary amine and/or secondary amine; and wherein amino acid is excess based on a stoichiometrical ratio of organic amine to amino acid in a reaction. A method for absorbing and desorbing carbon dioxide is further disclosed. In the absorbent system provided by the present disclosure, the conversion between primary (secondary) amine and (secondary) tertiary amine can be realized under the catalytic effect of amino acid with the changing of temperature, and carbon dioxide can be absorbed and desorbed effectively under a relatively low temperature.
Claims20
A carbon dioxide absorbent, comprising organic amine, amino acid, and water, wherein said organic amine comprises tertiary amine and primary amine and/or secondary amine;
- and
- wherein amino acid is excess based on a stoichiometrical ratio of organic amine to amino acid in a reaction.
A carbon dioxide absorbent, comprising organic amine, amino acid, and water,
- wherein said organic amine is mixed amine of tertiary amine and primary amine and/or secondary amine, and a molar ratio of a total amount of primary amine and secondary amine to amino acid is 1:(1.8-3.2);
- and
- wherein said primary amine is at least one selected from a group consisting of 2-amino-2-methyl-1-propanol, monoethanolamine, and 3-(methylamino)propylamine, said secondary amine is tertiarybutylamineethoxyethanol (TBEE), said tertiary amine is at least one selected from a group consisting of N-methyldiethanolamine, triethanolamine, and 2-(diisopropylamino)ethanol, and said amino acid is preferably at least one selected from a group consisting of alanine, aminoacetic acid, and serine.
A method for absorbing and desorbing carbon dioxide, comprising the following steps:
- a) dissolving organic amine and amino acid into water to obtain absorbent, wherein amino acid is excess based on a stoichiometrical ratio of organic amine to amino acid in a reaction;
- b) heating the absorbent and keeping the absorbent under an absorption temperature, and adding gas sample containing carbon dioxide to a bottom of the absorbent, so that carbon dioxide is absorbed by the absorbent;
- and
- c) heating the solution with carbon dioxide absorbed therein under stirring and keeping the solution under a desorption temperature, so that the carbon dioxide absorbed therein is desorbed and the absorbent is regenerated.
Dependencies are inferred from the claim text.