Carbon dioxide absorbent and method for absorbing carbon dioxide

Abstract

The invention discloses an oxidation inhibitor, a carbon dioxide absorbent and a carbon dioxide absorption method thereof. The carbon dioxide absorbent includes a mixed aqueous solution of ethanolamine (MEA) and sulfolane (TMS) and an oxidation inhibitor, and the oxidation inhibitor is selected from glycerin, D-sorbitol, xylitol or erythritol. MEA and TMS are 25%-50% and 20%-50% respectively, and the oxidation inhibitor is greater than 0 and less than or equal to 10%. The carbon dioxide absorbent is added to the absorption tower to make it absorb and react with carbon dioxide gas to form a carbon dioxide absorbing liquid. The carbon dioxide absorbing liquid enters the phase separator and is allowed to stand for stratification to form a rich phase rich in carbon dioxide and an absorption phase poor in carbon dioxide. The enriched phase enters the desorption tower to desorb high-purity carbon dioxide, and the absorption phase returns to the absorption tower as a carbon dioxide absorbent to continue to participate in the absorption reaction. The invention has the advantages of good oxidation inhibition of the absorbent, high efficiency of carbon dioxide absorption and the like.

Description

technical field [0001] The invention relates to an oxidation inhibitor, a carbon dioxide absorbent and a carbon dioxide absorption method thereof, belonging to the technical field of gas separation. Background technique [0002] CO 2 Capture and storage technology is an important technology that can reduce carbon emissions and alleviate the greenhouse effect. in various CO 2 Among the capture technologies, the alkaline solution absorption separation method is currently widely used and the technology is relatively mature. Among them, the alcohol amine solution absorbent has the advantages of strong absorption capacity, high absorption efficiency, and excellent cycle absorption performance, but its high energy consumption and degradation problems cannot be ignored. [0003] Aiming at the problem of the degradation of the absorbent itself, there are continuous reports on its inhibition methods in the open literature. For example, the patent document CN100352536C discloses t...

AI Technical Summary

Problems solved by technology

However, the absorbent still has the problem of being easily oxidized by oxygen in the mixed gas, resulting in serious loss of MEA and reduced absorption capacity.

However, research on antioxidants for physical-chemical mixed amine solutions with liquid-liquid phase transition properties, especially antioxidants for MEA-TMS two-phase absorbents, is still lacking.

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