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Phase-change ionic liquids for absorbing sulfur dioxide

An ionic liquid and phase change technology, which is applied in the field of ionic liquids that absorb SO2 by phase change, recovery, SO2 capture and separation. It can solve the problems of harsh desorption conditions, low system corrosion, high energy consumption and high cost, and improve the cyclic absorption performance. , The effect of reducing energy consumption and high absorption load

Active Publication Date: 2022-07-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relatively speaking, the organic amine method has high desulfurization efficiency and high selectivity (of which SO 2 is CO 2 50,000 times of that), the system has little corrosion, and the by-product has a high concentration of SO 2 The gas can be used to produce sulfuric acid, and the absorbent has good stability and low foaming, etc.; however, the organic amine desulfurization method has the disadvantages of high desorption temperature, large consumption of amine regeneration steam, and high energy cost
Another ionic liquid flue gas desulfurization technology, because it has the advantages of environmental protection, regeneration, and adjustable structure, many researchers have synthesized a series of guanidinium salts, imidazoles, alcohol amines, and quaternary amines. Use it to absorb SO 2 , explore its absorption performance and mechanism, and according to the designable characteristics of its structure, introduce various functional groups on the anion and cation in the ionic liquid: ether group, cyano group, halogen, etc., functionalize it, and continuously synthesize ions with specific needs liquid to improve SO 2 absorption properties; but ionic liquids absorb SO 2 The bonding force is relatively strong, the desorption conditions are harsh, the desorption energy consumption is large, and regeneration and recycling are difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At normal pressure of 20-50 °C, add proton sponge and formic acid into the gas washing bottle according to the molar ratio of 1:2, shake well, and mix them well to obtain proton sponge / formic acid ionic liquid, SO 2 The gas mass flow controller is passed into the gas washing bottle, and the liquid-solid phase transition occurs, and the reaction is about 12 minutes. 2 The distribution ratio in the solid phase is 94.2%, and the molar ratio of ionic liquid to absorb SO2 can reach 1.36mol SO 2 / mol IL (ionic liquid).

Embodiment 2

[0023] At normal pressure of 20-50 °C, add 1-methylbenzimidazole and acetic acid into the gas washing bottle according to the molar ratio of 1:2, shake well, and mix them thoroughly to obtain 1-methylbenzimidazole / acetic acid ion liquid, SO 2 The gas mass flow controller is passed into the gas washing bottle, and the liquid-solid phase transition occurs, and the reaction is about 12 minutes. 2 The partition ratio in the solid phase is 95.3%, the ionic liquid absorbs SO 2 The molar ratio of up to 1.31mol SO 2 / mol IL.

Embodiment 3

[0025] At normal pressure of 20-50°C, add 2-methylbenzimidazole and propionic acid into a gas washing bottle according to a molar ratio of 1:2, shake them up, and mix them thoroughly to obtain 2-methylbenzimidazole / propionic acid. Acid ionic liquid, SO 2 The gas mass flow controller is passed into the gas washing bottle, and the liquid-solid phase transition occurs, and the reaction is about 12 minutes. 2 The partition ratio in the solid phase is 94.5%, the ionic liquid absorbs SO 2 The molar ratio can reach 1.41mol SO 2 / mol IL.

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PUM

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Abstract

The invention discloses a phase change absorption SO 2 ionic liquids consisting of organic cations and organic or inorganic anions. The cations are provided by heterocyclic compounds such as imidazole, piperazine, and amine compounds, and the anions are provided by carboxylic acids, amino acids, inorganic acids, and the like. The substances that provide cations and anions are added according to the stoichiometric ratio of the reaction, and the temperature is between 20-50°C, and it can be prepared after the complete reaction. The ionic liquid has the advantages of low volatility and good thermal stability; the key is to absorb SO 2 After the liquid-solid phase transition occurs, only the enriched SO 2 One phase of desorption is sent to the regeneration tower for desorption, thereby greatly reducing the energy consumption of desorption. In addition, it can also absorb SO in a cycle 2 . Therefore, the ionic liquid is a kind of absorbent with good performance, which has great application prospects and is suitable for SO in coal-fired flue gas. 2 capture and separation.

Description

technical field [0001] The invention relates to SO in coal-fired flue gas 2 Capture, separation, recovery technology, specifically related to phase change absorption of SO 2 The ionic liquid belongs to the field of energy saving, emission reduction and gas purification. Background technique [0002] SO 2 It is a colorless gas with a strong pungent odor, which can cause serious harm to human health, plants and ecological environment. man-made SO 2 The main sources of pollution can be summarized as: fuel combustion, industrial production processes, and transportation. In my country, the proportion of these three sources is 70%, 20% and 10% respectively. A large amount of SO produced by fuel combustion 2 will cause great harm to public health, therefore, effective control of SO 2 It is an important research direction in the field of energy utilization and environmental protection in my country. With various industries SO 2 With the continuous escalation of emission sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCB01D53/1481B01D53/1493
Inventor 赵文波陈玲汪洋赵倩柴牧原徐志勇
Owner KUNMING UNIV OF SCI & TECH