Non-aqueous liquid-liquid phase-change absorbent for capturing carbon dioxide and application of non-aqueous liquid-liquid phase-change absorbent

Abstract

The invention discloses a non-aqueous liquid-liquid phase-change absorbent for capturing carbon dioxide and application of the non-aqueous liquid-liquid phase-change absorbent. The non-aqueous liquid-liquid phase-change absorbent consists of primary alcohol amine and a composite organic solvent, wherein the primary alcohol amine comprises hydroxyethyl ethylenediamine or ethanolamine; and the composite organic solvent is a mixed solution of dimethyl sulfoxide and pentamethyl diethylenetriamine. The non-aqueous liquid-liquid phase-change absorbent is a homogeneous solution before absorbing CO2,and liquid-liquid phase splitting occurs after the absorbent absorbs CO2; the non-aqueous liquid-liquid phase-change absorbent is used for absorbing pure CO2 or CO2 in mixed gas; a CO2-rich phase anda CO2-lean phase are separated, and the CO2-rich phase can be regenerated in a heating desorption mode. The non-aqueous liquid-liquid phase-change absorbent for capturing carbon dioxide is good in carbon dioxide absorption performance, excellent in phase splitting effect, low in energy consumption, convenient to recycle and not prone to corroding equipment, and the problems that an existing water-system liquid-liquid phase-change absorbent is still high in regeneration energy consumption and high in corrosivity are solved.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide emission reduction and recovery, and relates to a non-aqueous liquid-liquid phase change absorbent for carbon dioxide capture and its application. Background technique [0002] Global warming caused by the greenhouse effect has become one of the most prominent environmental problems in the world today. carbon dioxide (CO 2 ) as the most important greenhouse gas, its control and emission reduction is urgent. As an active participant in addressing climate warming, the Chinese government made a solemn commitment at the Paris Climate Conference in 2015 to reduce CO 2 Emissions peaked, CO per unit of GDP 2 Emissions have dropped by 60% to 65% compared with 2005. The above-mentioned carbon emission reduction targets have brought great pressure and challenges to China's related industries. Carbon emission reduction is mainly aimed at CO 2 Concentrate emission sources, the key is to convert CO...

AI Technical Summary

Problems solved by technology

However, as far as the existing water system liquid-liquid phase change absorbent is concerned, simply replacing water with a non-aqueous solvent cannot form an effective non-aqueous liquid-liquid phase change absorbent, and the absorbent absorbs CO 2 Afterwards, it is easy to produce viscous solids, which will slow down the mass transfer of the absorption system and make it difficult to transport in pipelines, which is not conducive to the recovery and reuse of absorbents, high cost and high energy consumption.

However, existing non-aqueous absorbents exist to absorb CO 2 The problem of not being able to separate phases in the end, the regeneration energy consumption is still very high

At present, there is no non-aqueous liquid-liquid phase change absorbent for carbon dioxide capture with good absorption performance and excellent phase separation effect.

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