Method for catching carbon dioxide by adopting alcohol amine type ion liquid

Abstract

The invention relates to a method for catching carbon dioxide by adopting alcohol amine type ion liquid, which is used for catching carbon dioxide gas by using alcohol amine type ion liquid based on metallic cation chelate as absorbing agents. The absorption pressure is 0.0001 to 0.2MPa, the absorption temperature is 30 DEG C to 120 DEG C, the absorption time is 0.1 to 2 hours, the desorption temperature is between 80 DEG C and 150 DEG C, and the desorption time is between 0.1 hours and 3 hours. The method has the advantages that the ion liquid is easy to prepare, the stability is good, the absorption capacity is high, the desorption is easy, and the like. The method belongs to a carbon dioxide catching method with the industrial application potential.

Description

technical field [0001] The invention relates to an alcohol amine-type ionic liquid based on metal cation chelation, which is applied to the chemical capture of carbon dioxide, realizes high-capacity, low-energy consumption, and recyclable capture of carbon dioxide, and provides an effective method for the industrial capture of carbon dioxide. potential method. Background technique [0002] With the rapid development of human society, climate change brought about by the greenhouse effect has increasingly become a major problem faced by human beings, seriously affecting the living environment of 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. The research on its capture, storage and utilization technology has attracted extensive attention of scientists at home and abroad. In addition, carbon dioxide is a very important carbon-raw material, which can be converted i...

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Problems solved by technology

[0003] At present, the traditional industrial carbon dioxide capture method is mainly the alcohol amine aqueous solution absorption method, which has the advantages of low production cost, fast absorption speed, and large absorption capacity, but there are also some limitations: such as solvents are volatile, equipment is easy to corrode, absorption According to statistics, if thermal power plants use this method to separate and capture carbon dioxide, their total energy output will drop by about 30%

In addition, in view of the complex synthesis of functionalized ionic liquids and the high viscosity of ionic liquids, Noble et al. (Ind. Eng. Chem. Res. 2008, 47, 8496) proposed a new method of capturing carbon dioxide using a solution composed of ionic liquids and alcohol amines. strategy, indicating that this method has the advantages of high absorption capacity and fast absorption rate, but the main problem is that alcohol amines are highly volatile and have poor cycle performance.

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