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Synthesis method of porous ionic liquid for removing NOx in flue gas

A technology of ionic liquids and synthesis methods, applied in separation methods, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., can solve problems such as cumbersome preparation processes, and achieve simple workflow and mild reaction conditions , the effect of less dosage

Inactive Publication Date: 2021-05-28
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its preparation process is cumbersome and limited to CO 2 The separation and recovery process

Method used

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  • Synthesis method of porous ionic liquid for removing NOx in flue gas

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Experimental program
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Embodiment 1

[0035] 2.0gN-butyl imidazole and 2.20g n-bromobutane are added in the three-necked flask, N 2As a protective gas, it was heated to reflux in an oil bath at 60°C and stirred for 7h. Evaporate in vacuo at 40°C to remove excess n-bromobutane, and cool to room temperature. Use diethyl ether as the extractant and apply vigorous stirring to remove residual N-methylimidazole. The solvent was evaporated and dried under vacuum for 4h to obtain viscous liquid [BMIM]Br. Equimolar lithium bis(trifluoromethanesulfonyl)imide (LiNTf 2 ) was slowly added to 2.0g [BMIM]Br, and after electromagnetic stirring at room temperature for 2h, it was extracted with chloroform (10mL×3). The organic phase was evaporated in vacuo at 90°C to obtain a viscous liquid [BMIM][NTf 2 ].

[0036] At room temperature, 2.97g Zn(NO 3 )·6H 2 O and 2.46 g of 2-methylimidazole were respectively dissolved in 100 mL of methanol, then, the two solutions were mixed and stirred continuously for 15 hours. Subsequentl...

Embodiment 2

[0039] 2.0gN-butyl imidazole and 2.20g n-bromobutane are added in the three-necked flask, N 2 As a protective gas, it was heated to reflux in an oil bath at 60°C and stirred for 7h. Evaporate in vacuo at 40°C to remove excess n-bromobutane, and cool to room temperature. Use diethyl ether as the extractant and apply vigorous stirring to remove residual N-methylimidazole. The solvent was evaporated and dried under vacuum for 4h to obtain viscous liquid [BMIM]Br. Equimolar lithium bis(trifluoromethanesulfonyl)imide (LiNTf 2 ) was slowly added to 2.0g [BMIM]Br, and after electromagnetic stirring at room temperature for 2h, it was extracted with chloroform (10mL×3). The organic phase was evaporated in vacuo at 90°C to obtain a viscous liquid [BMIM][NTf 2 ].

[0040] At room temperature, 2.97g Zn(NO 3 )·6H 2 O and 2.46 g of 2-methylimidazole were respectively dissolved in 100 mL of methanol, then, the two solutions were mixed and stirred continuously for 15 hours. Subsequent...

Embodiment 3

[0043] 2.0gN-butyl imidazole and 2.20g n-bromobutane are added in the three-necked flask, N 2 As a protective gas, it was heated to reflux in an oil bath at 60°C and stirred for 7h. Evaporate in vacuo at 40°C to remove excess n-bromobutane, and cool to room temperature. Use diethyl ether as the extractant and apply vigorous stirring to remove residual N-methylimidazole. The solvent was evaporated and dried under vacuum for 4h to obtain viscous liquid [BMIM]Br. Equimolar lithium bis(trifluoromethanesulfonyl)imide (LiNTf 2 ) was slowly added to 2.0g [BMIM]Br, and after electromagnetic stirring at room temperature for 2h, it was extracted with chloroform (10mL×3). The organic phase was evaporated in vacuo at 90°C to obtain a viscous liquid [BMIM][NTf 2 ].

[0044] At room temperature, 2.97g Zn(NO 3 )·6H 2 O and 2.46 g of 2-methylimidazole were respectively dissolved in 100 mL of methanol, then, the two solutions were mixed and stirred continuously for 15 hours. Subsequent...

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Abstract

The invention relates to a synthesis method of a porous ionic liquid for removing NOx in flue gas and a device suitable for the method. According to the method, the porous ionic liquid is synthesized from an ionic liquid synthesized by taking imidazole as a cation and taking [NTf2] as an anion and a ZIFs material. The method adopts mild reaction conditions and comprises the following steps: firstly, preparing imidazolyl [NTf2] ionic liquid under mild reaction conditions, dissolving Zn(NO3).6H2O and 2-methylimidazole in a methanol solution according to a molar ratio of 1:8 to prepare a ZIFs material, respectively dispersing the synthesized ionic liquid and ZIFs into corresponding solvents, uniformly dispersing the synthesized ionic liquid and the ZIFs through ultrasonic oscillation, mixing homogeneous solutions, and conducting drying to obtain the porous ionic liquid. The reaction conditions of each step of the synthesis method are mild, and the selected ionic liquid monomer is imidazolium salt which is easy to biodegrade and does not cause environmental pollution. The prepared porous ionic liquid can be independently used as a NOx adsorbent, and in practical application, the dosage is small, the adsorption capacity is large, and the cost is low.

Description

【Technical field】 [0001] The invention relates to a method for NO in flue gas x Synthesis of desorbed porous ionic liquids. The invention belongs to the technical field of material preparation and chemical separation. 【Background technique】 [0002] my country is a country where coal is the main energy source, and 75% of the primary energy comes from coal combustion. Coal-fired power generation is the main utilization of coal, and the flue gas produced by it contains sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ) and other acidic gases will cause environmental problems such as acid rain and photochemical smog. Therefore, controlling the emission of pollutants from coal-fired flue gas is one of the important tasks in my country's environmental governance. [0003] NO in flue gas x The main component of Nitrogen is nitric oxide (NO), which has low solubility in aqueous solution and is therefore difficult to remove. On the other hand, NO is an important intermediate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01D53/14
CPCB01J31/0281B01J31/0292B01D53/1493B01D53/1456B01D2252/30B01D2252/205
Inventor 马艺心徐冬梅高军张连正张治山赵萍萍
Owner SHANDONG UNIV OF SCI & TECH