Carbon dioxide absorbent solution

Abstract

Disclosed is a carbon dioxide absorbent solution which can absorb carbon dioxide in a large quantity and rarely causes the precipitation of a material produced by the reaction with carbon dioxide. The carbon dioxide absorbent solution is characterized by comprising an aqueous solution and an amino acid salt that has at least one carboxylic acid salt bound to a heterocyclic ring containing at least one nitrogen atom as a ring-forming element and contained in the aqueous solution.

Description

technical field [0001] The present invention relates to a carbon dioxide absorbing liquid for removing carbon dioxide from mixed gas. Background technique [0002] In recent years, an increase in the concentration of carbon dioxide in the atmosphere has been pointed out as one of the causes of the global warming phenomenon, and opportunities to suppress carbon dioxide emission are increasing. As a method for separating carbon dioxide from the atmosphere, there is known an absorption method in which carbon dioxide is reacted with a carbon dioxide absorbing liquid containing an absorbent to form a product, and the product is recovered. The recovered product is decomposed into carbon dioxide and absorbent and the absorbent is regenerated into carbon dioxide absorbing liquid. [0003] Alkanolamines are known as absorbents contained in carbon dioxide absorbing liquids, but alkanolamines are slow in absorbing and releasing carbon dioxide. Therefore, a hybrid absorbent for carbon...

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Problems solved by technology

[0003] Alkanolamines are known as absorbents contained in carbon dioxide absorbing liquids, but alkanolamines are slow in absorbing and releasing carbon dioxide

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