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Method for absorbing SO2 by using renewable eutectic solvent

A deep eutectic solvent, SO2 technology, applied in separation methods, chemical instruments and methods, specific gas purification/separation, etc., can solve the problems of high cost of ionic liquids, hindering industrial applications, difficult biodegradation, etc., and achieve desulfurization agent environment The effect of friendliness, low cost, and low energy consumption for desorption

Active Publication Date: 2017-08-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ionic liquids have high cost and absorb SO 2 However, problems such as high viscosity, difficulty in biodegradation, and certain toxicity hinder its further industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 10.005g of betaine and put it in a 50ml Erlenmeyer flask, add 13.255g of ethylene glycol. Put the Erlenmeyer flask into a constant temperature water bath at 60°C for 1 hour with magnetic stirring; then cool to room temperature to obtain 23.230 g of deep eutectic solvent, in which the mass ratio of hydrogen bond donor to hydrogen bond acceptor is 1.32:1. Take 3g of the synthesized deep eutectic solvent and add it into a self-made bubbling desulfurizer, and simulate flue gas (SO 2 Volume content 2%, N 2 volume content 98%) is passed into the desulfurizer at a rate of 120ml / min, and the absorption temperature is 40°C. After reaching absorption saturation, the SO2-containing 2 rich liquid, the absorbent absorbs SO 2 Capacity is 0.085g SO 2 / g absorbent. Heat the above-mentioned rich solution to 80°C, flash desorb SO under stirring and decompression 2 , recover SO 2 , SO 2 The desorption efficiency reaches 88%.

Embodiment 2

[0020] Weigh 10.003g of betaine and put it in a 50ml Erlenmeyer flask, add 15.987g of ethylene glycol. Put the Erlenmeyer flask into a constant temperature water bath at 60°C for 1 hour with magnetic stirring; then cool to room temperature to obtain 25.990 g of deep eutectic solvent, in which the mass ratio of hydrogen bond donor to hydrogen bond acceptor is 1.6:1. Take 3g of the synthesized deep eutectic solvent and add it into a self-made bubbling desulfurizer, and simulate flue gas (SO 2 Volume content 2%, N 2 volume content 98%) is passed into the desulfurizer at a rate of 120ml / min, and the absorption temperature is 40°C. After reaching absorption saturation, the absorbent absorbs SO 2 Capacity is 0.073g SO 2 / g absorbent. Heat the above-mentioned rich solution to 90°C, flash desorb SO under stirring and decompression 2 , recover SO 2 , SO 2 The desorption efficiency reaches 93%.

Embodiment 3

[0022] Weigh 10.013g of betaine and put it in a 50ml Erlenmeyer flask, add 21.217g of ethylene glycol. Put the Erlenmeyer flask into a constant temperature water bath at 60°C for 1 hour with magnetic stirring; then cool to room temperature to obtain 31.230 g of deep eutectic solvent, in which the mass ratio of hydrogen bond donor to hydrogen bond acceptor is 2.1:1. Take 3g of the synthesized deep eutectic solvent and add it into a self-made bubbling desulfurizer, and simulate flue gas (SO 2 Volume content 2%, N 2 volume content 98%) is passed into the desulfurizer at a rate of 120ml / min, and the absorption temperature is 40°C. After reaching absorption saturation, the absorbent absorbs SO 2 Capacity is 0.061g SO 2 / g absorbent. Heat the above-mentioned rich solution to 90°C, flash desorb SO under stirring and decompression 2 , recover SO 2 , The desorption efficiency reaches 93%.

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PUM

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Abstract

The present invention provides a process method for absorbing SO2 by using a renewable eutectic solvent. The process method comprises: absorbing SO2 in flue gas at a certain absorption temperature by using an eutectic solvent formed from a quaternary ammonium inner salt hydrogen bond acceptor and a hydrogen bond donor according to a certain ratio as an absorbent, and regenerating the eutectic solvent and recovering the SO2 at a certain temperature by using a steam stripping or flash evaporation method. According to the present invention, the biodegradable, non-toxic and environmentally friendly eutectic solvent is used as the absorbent to rapidly and efficiently absorb the SO2 in the flue gas and the regeneration of the absorbent and the resource utilization of the SO2 are achieved, such that the poisoning of the absorbent on the environment is reduced, and the formation of the absorption by-product is avoided.

Description

technical field [0001] The present invention relates to the absorption of SO by renewable absorbents 2 Methods. Specifically, the present invention relates to a deep eutectic solvent formed by a quaternary ammonium inner salt hydrogen bond acceptor and a hydrogen bond donor according to a certain ratio as an absorbent to absorb SO 2 and recover SO 2 Methods. Background technique [0002] Coal occupies an absolute dominant position in my country's energy and is mainly used for coal-fired power generation. Coal power accounts for more than 70% of my country's electricity sources. Coal contains about 1% elemental sulfur, and a large amount of SO is produced during the combustion of coal 2 gas. SO 2 It is a typical air pollutant. If it is discharged, it will not only cause environmental problems such as acid rain and smog, but also cause a persistent threat to the living environment of humans, animals and plants, thus triggering a series of ecological problems. On the ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01B17/56
CPCB01D53/1481B01D53/1493B01D2252/20B01D2252/202B01D2252/2023B01D2257/302B01D2258/0283C01B17/56C01B2210/0025
Inventor 吴卫泽张凯任树行
Owner BEIJING UNIV OF CHEM TECH
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