Method for gathering carbon dioxide by using high-stability alkaline ionic liquid

Abstract

The invention relates to a method for gathering carbon dioxide, in particular to a method for gathering carbon dioxide by using high-stability alkaline ionic liquid, wherein carbon dioxide gas is absorbed by taking alkalescent quaternary phosphonium type ion liquid as an absorbent; the absorption pressure is 0.0001-0.2MPa; the absorption temperature is 10-70 DEG C; the absorption time is 0.1-2h; the absorbed carbon dioxide can be desorbed easily; the desorption temperature is within 80-150DEG C; and the desorption time is within 0.1-3h. In the invention, the high-stability alkaline ionic liquid is applied to the chemical gathering of carbon dioxide so that a high-capacity, low-energy consumption and recyclable gathering method of carbon dioxide is realized and a potential method is provided for the industrial gathering of carbon dioxide.

Description

technical field [0001] The invention relates to a method for capturing carbon dioxide, in particular, it is a method of applying a high-stability alkaline ionic liquid to the chemical capture of carbon dioxide, thereby realizing a high-capacity, low-energy consumption, and recyclable capture method for carbon dioxide , providing a potential method for the industrial capture of carbon dioxide. Background technique [0002] With the rapid development of economy and society, the climate change brought about by the greenhouse effect has increasingly become a major environmental problem faced by human beings. In recent years, as a major greenhouse gas, the emission of carbon dioxide has increased year by year, which has exacerbated the greenhouse effect and seriously affected human survival and the ecological environment. Its capture, storage and utilization have attracted widespread attention at home and abroad. In addition, carbon dioxide can also be converted into various o...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional industrial method of capturing carbon dioxide is the alcohol amine absorption method, which has the advantages of low cost, fast absorption, and large capacity, but there are also some limitations: such as the solvent is volatile, the equipment is easy to corrode, and the absorbent is easy to oxidize and regenerate. high energy consumption

At present, the main problem of the chemical trapping of functionalized ionic liquids is that the absorption energy is large, generally greater than 80kJ mol -1 , not easy to detach

In addition, someone has measured the solubility of carbon dioxide in polyionic liquids under pressure, showing that the solubility of carbon dioxide in polyionic liquids is about 6-8 times that of ordinary imidazole-type ionic liquids, but the absorption capacity is still small under normal pressure. Less than 0.1 moles of carbon dioxide per mole of ionic liquid

Therefore, in various methods of capturing carbon dioxide by using ionic liquids, although the absorption energy of physical absorption is small, the absorption capacity is too small; while the absorption capacity of chemical absorption is large, but the absorption energy is relatively large.

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