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Technical method for capturing nitric oxide by using amino acid anionic functional ionic liquid and regeneration method of amino acid anionic functional ionic liquid

An ionic liquid and anionic technology, applied in the field of flue gas denitrification

Pending Publication Date: 2019-10-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the absorption of NO by these ionic liquids is mainly physical absorption. It has a relatively high absorption capacity for high-concentration NO and a small absorption capacity for low-concentration NO. Therefore, these two documents only involve the absorption of high-concentration NO.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take by weighing 25% tetraethylammonium hydroxide aqueous solution ([N 2222 ]OH) 62.3120g and sarcosine (Sar) 9.4215g were added to a 250ml round bottom flask, and magnetically stirred at room temperature for 12h. Then, the excess moisture was removed by rotary evaporation at a temperature of 70 °C, and at 100 °C with N 2 Sweep to constant weight, obtain tetraethylammonium sarcosinate ionic liquid [N 2222 ][Sar]. Weigh 1.9555 g of the amino acid functionalized ionic liquid, add it into a self-made bubbling denitrification device, and simulate flue gas (NO volume content is 0.4%, N 2 The volume content is 99.6%) to the denitrification device at a rate of 50ml / min, and the absorption temperature is 30°C. When the absorption saturation is reached, the NO-containing rich solution is obtained. The NO absorption capacity measured by weighing method is 0.1397g, and the NO absorption capacity of the absorbent is calculated to be 0.52mol NO / mol IL. The above-mentioned rich l...

Embodiment 2

[0020] Take by weighing 25% tetrabutyl phosphorus hydroxide aqueous solution ([P 4444 ]OH) 78.6436g and glycine (Gly) 5.3391 were added to a 250ml round bottom flask, and magnetically stirred at room temperature for 12h. Remove excess moisture by rotary evaporation at 70°C, and at 100°C in N 2 Sweep to constant weight, obtain tetrabutylphosphonium glycinate ionic liquid [P 4444 ][Gly]. Weigh 1.9573 g of the amino acid functionalized ionic liquid, add it into a self-made bubbling denitrification device, and simulate flue gas (NO volume content 0.4%, N 2 volume content 99.6%) is passed into the denitrification device at a rate of 50ml / min, and the absorption temperature is 20°C. When the absorption saturation is reached, the NO-containing rich solution is obtained. The NO absorption capacity measured by weighing method is 0.1074g, and the NO absorption capacity of the absorbent is calculated to be 1.25mol NO / mol IL. The above-mentioned rich liquid was heated to 120° C., flas...

Embodiment 3

[0022] Weigh 24.2353 g of 49% choline hydroxide aqueous solution (Ch) and 13.1241 g of proline (L-Pro) at a molar ratio of 1:1, add them into a 250 ml round bottom flask, and stir magnetically at room temperature for 12 h. Remove excess moisture by rotary evaporation at 70°C, and at 100°C in N 2 Purge to constant weight to obtain choline-proline salt ionic liquid [Ch][L-Pro]. Weigh 1.7944 g of the amino acid functionalized ionic liquid, add it into a self-made bubbling denitrification device, and simulate flue gas (NO volume content 0.09%, N 2 volume content 99.91%) is passed into the denitrification device at a rate of 50ml / min, and the absorption temperature is 20°C. When the absorption saturation is reached, the NO-containing rich solution is obtained. The NO absorption capacity measured by weighing method is 0.1153 g, and the NO absorption capacity of the absorbent is calculated to be 0.43 molNO / mol IL. The above-mentioned rich liquid was heated to 90° C., flashed at a p...

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Abstract

The invention provides a technical method for capturing nitric oxide by using amino acid anionic functional ionic liquid and a regeneration method of the amino acid anionic functional ionic liquid. The method includes the following steps that the amino acid anionic functional ionic liquid serves as an absorbent; NO in flue gas is absorbed when the temperature is 20-60 DEG C and the NO volume concentration is 0.05-2%; through a flash evaporation method, regeneration of the ionic liquid and recovery of NO from the flue gas are achieved at the temperature of 80-120 DEG C and the pressure of 1-100kPa. NO can be rapidly and efficiently absorbed from the flue gas, the regeneration of the absorbent and resource utilization of NO are achieved, and meanwhile the functional ionic liquid adopted bythe method has the advantages of being free of toxicity and environmentally friendly and can effectively reduce the environmental pollution caused by the absorbent.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, and relates to a process method for trapping and regenerating nitric oxide (NO) in flue gas by using an amino acid anion type functionalized ionic liquid. The method includes using an amino acid anionic ionic liquid as an absorbent, absorbing NO in flue gas at 20-60°C and a volume concentration of NO of 0.05%-2%, and then regenerating the ionic liquid and recovering the ionic liquid by flash evaporation. Absorbed NO. [0002] technical background [0003] Coal occupies an absolute dominant position in my country's energy and is mainly used for coal-fired power generation. In my country's electricity sources, coal power accounts for more than 60%. The combustion of coal produces large amounts of nitric oxide (NO) every year. NO is one of the main sources of air pollution. If the NO emission produced by burning coal will not only cause environmental problems such as acid rain and photoche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/96B01D53/56C01B21/24
CPCB01D53/78B01D53/96B01D53/56C01B21/24B01D2251/80B01D2258/0283
Inventor 吴卫泽孙颖任树行
Owner BEIJING UNIV OF CHEM TECH
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