Oxidation inhibitor, carbon dioxide absorbent and carbon dioxide absorption method thereof

Abstract

The invention discloses an oxidation inhibitor, a carbon dioxide absorbent and a carbon dioxide absorption method thereof. The carbon dioxide absorbent comprises a mixed aqueous solution of ethanolamine (MEA) and sulfolane (TMS) and an oxidation inhibitor, wherein the oxidation inhibitor is selected from glycerol, D-sorbitol, xylitol and erythritol; and MEA and TMS account for 25%-50% and 20%-50%respectively, and the content of the oxidation inhibitor is greater than 0 and less than or equal to 10%. The method comprises the following steps: adding the carbon dioxide absorbent into an absorption tower for an absorption reaction with carbon dioxide gas to form a carbon dioxide absorption liquid; enabling the carbon dioxide absorption liquid to enter a phase splitter for standing and layering to form an enriched phase enriched with carbon dioxide and a lean carbon dioxide absorption phase; and enabling the enriched phase to enter a desorption tower to desorb high-purity carbon dioxide, and returning the absorption phase to the absorption tower as the carbon dioxide absorbent to continuously participate in the absorption reaction. The method has the advantages of good absorbent oxidation inhibition, high carbon dioxide absorption efficiency 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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