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Process method of absorbing SO2 in smoke by using deep eutectic solvent and regenerating deep eutectic solvent by using H2S

A low eutectic solvent and process method technology, applied in chemical instruments and methods, separation methods, sulfur compounds, etc., can solve the problems of increasing energy consumption and operating costs, high cost of ionic liquids, hindering industrial applications, etc., and achieve low cost. , Environmentally friendly and stable

Inactive Publication Date: 2018-02-09
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.
In addition, in the regeneration process of the absorbent, steam stripping or flash evaporation under high temperature conditions are generally used, which consumes a lot of energy and increases energy consumption and operating costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 10.01 g of imidazole and place it in a 50 mL Erlenmeyer flask, and add 27.03 g of glycerol. 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 37.04 g of deep eutectic solvent, in which the mass ratio of hydrogen bond donor to hydrogen bond acceptor is 2.7:1. Take 3.00 g of the synthesized deep eutectic solvent, 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 100mL / min, and the absorption temperature is 40°C. After reaching absorption saturation, the SO2-containing 2 The rich liquid, adopt the iodometric method (HJ / T56-2000, the Ministry of Environmental Protection of the People's Republic of China, the same below) to measure the SO in the absorption liquid 2 content, the absorbent absorbs SO 2 Capacity is 0.27gSO 2 / g absorbent. Take 1.41g of absorpt...

Embodiment 2

[0021] Weigh 10.03 g of imidazole and place it in a 100 mL Erlenmeyer flask, and add 40.12 g of glycerol. Put the Erlenmeyer flask into a constant temperature water bath at 60°C and stir it magnetically for 1 hour; then cool it down to room temperature to obtain 50.15 g of deep eutectic solvent, in which the mass ratio of hydrogen bond donor to hydrogen bond acceptor is 4.1:1. Take 3.00 g of the synthesized deep eutectic solvent, 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 100mL / min, and the absorption temperature is 40°C. After the absorption saturation is reached, the SO-containing 2 The rich solution, the SO in the absorption solution was determined by iodometric method 2 content, the absorbent absorbs SO 2 Capacity is 0.20gSO 2 / g absorbent. Take 1.85g of absorption liquid (containing 0.31gSO 2 ) into a 25mL high-pressure airtight reactor, and a pre...

Embodiment 3

[0023] Weigh 10.02 g of imidazole and place it in a 100 mL Erlenmeyer flask, and add 54.13 g of glycerol. 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 64.15 g of deep eutectic solvent, in which the mass ratio of hydrogen bond donor to hydrogen bond acceptor is 5.4:1. Take 3.00 g of the synthesized deep eutectic solvent, 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 100mL / min, and the absorption temperature is 40°C. After the absorption saturation is reached, the SO-containing 2 The rich solution, the SO in the absorption solution was determined by iodometric method 2 content, the absorbent absorbs SO 2 Capacity is 0.16gSO 2 / g absorbent. Take the absorption liquid 2.18g (containing 0.30gSO 2 ) into a 25mL high-pressure airtight reactor, and the pressure o...

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Abstract

The invention provides a process method for absorbing sulfur dioxide (SO2) in flue gas with a deep eutectic solvent and regenerating it with hydrogen sulfide (H2S). The process method includes using a deep eutectic solvent formed by a hydrogen bond acceptor and a hydrogen bond donor according to a certain ratio as an absorbent, absorbing SO2 in the flue gas at a certain absorption temperature, and then using H2S to regenerate the deep eutectic solvent at a certain temperature. Solvents and recovery of sulfur resources. The method uses cheap, high thermal stability and easy-to-synthesize deep eutectic solvent as an absorbent to absorb SO2 in flue gas. In addition, compared with the traditional regeneration method (steam stripping or flash evaporation), the regeneration temperature of this regeneration method is low, which greatly reduces the regeneration energy consumption, and can quickly and efficiently realize the regeneration of the absorbent and the resource utilization of SO2.

Description

technical field [0001] The invention relates to a renewable absorbent for absorbing sulfur dioxide (SO 2 )Methods. Specifically, the present invention relates to a deep eutectic solvent formed by a hydrogen bond acceptor and a hydrogen bond donor in a certain ratio as an absorbent to absorb SO 2 and hydrogen sulfide (H 2 S) A method of regenerating the absorbent and recovering sulfur. 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 sulfur dioxide (SO 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 ...

Claims

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Application Information

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IPC IPC(8): B01D53/14C01B17/04
CPCB01D53/1425B01D53/1481B01D53/1493B01D2252/202B01D2252/2023B01D2252/205B01D2252/2053B01D2258/0283C01B17/0404
Inventor 吴卫泽张凯任树行
Owner BEIJING UNIV OF CHEM TECH
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