A deep eutectic solvent for removing carbon dioxide from air and flue gas

Abstract

The present invention relates to CO 2 The field of adsorption and capture, specifically relates to a deep eutectic solvent for removing carbon dioxide in air and flue gas, which is composed of a hydrogen bond donor and a hydrogen bond acceptor, and the hydrogen bond donor and the hydrogen bond acceptor are connected by hydrogen bond association to form a binary or ternary eutectic eutectic mixture, wherein the hydrogen bond acceptor can be one of calcium chloride, ammonium chloride, calcium chloride hydrate, zinc chloride, and the hydrogen donor can be It is one of ethanolamine, diethanolamine, triethanolamine, diethylenetriamine, N,N-dimethylethylenediamine, 1,5-diazabicyclo[4,3,0]-non-5-ene Or two, the deep eutectic solvent is obtained by stirring and mixing at no lower than 30°C, which can effectively increase the reaction speed with carbon dioxide, increase the adsorption capacity, and reduce the energy consumption of desorption; the low co-solvent prepared by the present invention can effectively improve the adsorption of carbon dioxide capture efficiency.

Description

technical field [0001] The present invention relates to CO 2 The field of adsorption capture specifically relates to a deep eutectic solvent for removing carbon dioxide in air and flue gas. Background technique [0002] Carbon dioxide is the main greenhouse gas, and its emission leads to global temperature rise. The resulting environmental problems are related to the survival and development of human beings, and are one of the most severe challenges facing human society. Research shows that by the end of the 21st century CO 2 Emissions will increase the global temperature by 6°C, far exceeding the "safety line" of 2°C. If no measures are taken, it will bring disastrous consequences. Combustion of fossil fuels results in massive CO emissions 2 , resulting in accelerated global warming in recent years. However, due to the low price of coal and the mature development of combustion technology, it has caused human dependence on fossil fuels, and it will still be the main sour...

AI Technical Summary

Problems solved by technology

Therefore, amine absorbents have fast absorption speed, strong absorption capacity, and low cost, but organic amine absorbents are easily degraded by impurities such as organic matter, inorganic matter, and solid particles, resulting in solvent loss.

In addition, this method needs to consume a large amount of energy in the recycling process of the amine solution, and the corrosion of the equipment is relatively serious.

Ionic liquids have promising material numbers as an alternative to organic amine solutions, but their high viscosity leads to slow mass transfer, CO 2 The adsorption rate is low, and the adsorption amount calculated per gram of adsorbent is much lower than that of organic amine solution, which cannot meet the requirements of use