Two-phase amine absorbent for capturing carbon dioxide and application thereof

Abstract

The invention discloses a two-phase amine absorbent for capturing carbon dioxide and the application thereof. The two-phase amine absorbent is a ternary component system formed by diethylenetriamine, pentamethyl diethylenetriamine and water. The total concentration of diethylenetriamine and pentamethyl diethylenetriamine in water is 4-5 mol / L, and the molar ratio of diethylenetriamine to pentamethyl diethylenetriamine is (1:4)-(4:1). The independent aqueous solutions of the two organic amines do not have phase separation ability after absorbing CO2; however, the two-phase amine absorbent consisting the ternary component system has phase separation ability, and the two-phase amine absorbent is a homogeneous solution before absorbing CO2 and is divided into two phases after absorbing CO2. After saturated absorption, CO2 is rich in water phase; after phase separation, it only needs to conduct thermal regeneration on solution rich in CO2, so that rich liquid amount required for regeneration is reduced greatly, regeneration energy consumption can be effectively reduced, efficient CO2 absorbability can be maintained, and application prospects are broad.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide capture, in particular to a two-phase amine absorbent for capturing carbon dioxide and its application. Background technique [0002] Global warming has brought severe challenges to human survival and social development, and is a major environmental problem that needs to be solved urgently. To tackle global climate change, the key is to reduce greenhouse gases, especially carbon dioxide (CO 2 ) emissions. At the World Climate Conference held in 2009, the Chinese government solemnly promised that by 2020, CO emissions per unit of gross domestic product (GDP) 2 Compared with 2005, it has dropped by 40 to 45%, which has brought huge challenges to related industries in my country. in many CO 2 Among the emission reduction technologies, chemical absorption methods, especially organic amine absorption methods, have been applied in industry. The method uses CO 2 Reversible chemical reaction ...

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Problems solved by technology

However, there is no two-phase amine absorbent with good absorption effect and low amount of rich liquid to be regenerated.

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