A method for capturing sulfur dioxide by functionalized ionic liquids containing tertiary amino groups and cyanopyridines

A technology containing ionic liquids and tertiary amine groups, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of desorption requiring more heat, high biodegradability, and low synthesis cost. It is easy to achieve Effects of complete desorption, high biodegradability, and low synthesis cost

Active Publication Date: 2016-02-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101870680A reports a kind of preparation method of tertiary amine functionalized imidazole ionic liquid, and in SO 2 Preliminary explorations have been made in trapping applications, but the anions of this type of ionic liquid are limited to BF 4 － and PF 6 － , and for SO 2 The absorption capacity is low (2.50molSO 2 / molIL), the desorption temperature is also higher (90-100°C)
Academician Han Buxing et al. (ChemSusChem, 2013, 6, 1191) reported a cation containing tertiary amine groups and anion tetrazole-based imidazole functionalized ionic liquid for SO 2 Capture separation, although its absorption is high (4.32molSO 2 / molIL), but due to the combination of anions and cations with SO 2 At the same time, there is a chemical effect that requires more heat for desorption
CN101993378A provides a method for preparing an ionic liquid containing amine groups (one or more of primary amines, secondary amines, and tertiary amines), wherein the ionic liquid is composed of organic polyamines and inorganic acids or organic acids through acid Alkaline neutralization reaction is obtained, and this type of ionic liquid is used for CO 2 、H 2 S, SO 2 Absorption of acidic gases such as, but this type of ionic liquid is effective for CO 2 and SO 2 SO in gas 2 no selective absorption
[0006] Compared with the existing reported tertiary amino imidazole ionic liquids, pyridine ionic liquids have the advantages of lower synthesis cost, high biodegradability and lower toxicity. SO 2 The content of absorption and separation has not been reported in the literature

Method used

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  • A method for capturing sulfur dioxide by functionalized ionic liquids containing tertiary amino groups and cyanopyridines
  • A method for capturing sulfur dioxide by functionalized ionic liquids containing tertiary amino groups and cyanopyridines
  • A method for capturing sulfur dioxide by functionalized ionic liquids containing tertiary amino groups and cyanopyridines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Weigh 25.146g (0.096mol) of 2-diethylaminoethyl bromide hydrobromide, dissolve it in 50ml of acetonitrile and add it to a three-necked flask, mix 7.621g (0.096mol) of pyridine with 50ml of acetonitrile, Add dropwise into the three-necked bottle through the dropping funnel. After the pyridine was added dropwise, it was heated to reflux at 80°C, stirred for 12 hours, and then the reaction was terminated. The product obtained by the reaction was washed and filtered with acetone several times, and dried in vacuum at 60°C for 48 hours to obtain pure white solid 1-(2-diethylaminoethyl)-pyridinium bromide hydrobromide (31.650 g, yield 96.59%). Dissolve 1-(2-diethylaminoethyl)-pyridinium bromide hydrobromide (29.650g, 0.087mol) in 30ml of methanol, and then add equimolar hydroxide Sodium (3.487g, 0.087mol) methanol solution was stirred at room temperature for 12h, then sodium thiocyanate (7.068g, 0.087mol) was added, and stirred at room temperature for 6h. After the reacti...

Embodiment 2

[0021] 1) In a self-made absorption bottle with an internal diameter of 3 cm, add 5.0 g of the ionic liquid 1-(2-diethylaminoethyl)-pyridine thiocyanate synthesized in 1) in Example 1, and then feed pure SO 2 For gas, the gas flow rate is 140ml / min, the temperature is 20°C, and the pressure is 0.1MPa. Weigh the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 90 minutes. Calculate the SO in the ionic liquid 2 The absorption capacity is 1.060gSO 2 / g ionic liquid (3.958molSO 2 / mol ionic liquid).

[0022] 2) In a self-made absorption bottle with an inner diameter of 3 cm, add 5.0 g of ionic liquid N-butylpyridine thiocyanate, and then feed pure SO 2 For gas, the gas flow rate is 140ml / min, the temperature is 20°C, and the pressure is 0.1MPa. Weigh the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 90 minutes. Calculate the SO in the i...

Embodiment 3

[0025] 1) In a self-made absorption bottle with an inner diameter of 3cm, add 2) ionic liquid 1-(2-diethylaminoethyl)-pyridine dicyandiamide salt synthesized in 5.0g embodiment 1, then pass into pure SO 2 For gas, the gas flow rate is 140ml / min, the temperature is 20°C, and the pressure is 0.1MPa. Weigh the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 90 minutes. Calculate the SO in the ionic liquid 2 The absorption capacity is 0.972gSO 2 / g ionic liquid (3.753molSO 2 / mol ionic liquid).

[0026] 2) In a self-made absorption bottle with an inner diameter of 3 cm, add 5.0 g of ionic liquid N-butylpyridine dicyandiamide salt, and then feed pure SO 2 For gas, the gas flow rate is 140ml / min, the temperature is 20°C, and the pressure is 0.1MPa. Weigh the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 90 minutes. Calculate the SO in th...

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Abstract

The invention relates to a method for absorbing SO2 by virtue of pyridine functionalized ionic liquid and belongs to the field of gas purification. The functionalized ionic liquid is prepared from positive ions of tertiary amine group contained pyridine or derivatives thereof and negative ions containing a nitrile group. The ionic liquid has the characteristics of good stability, easiness in biodegradation, less toxicity and the like, is high in SO2 absorption capacity and high in SO2 selectivity and is easy to desorb SO2. Thus, the method for capturing SO2 by virtue of the pyridine ionic liquid containing a tertiary amine group and a nitrile group at the same time has extremely high industrial application potential.

Description

technical field [0001] The invention belongs to the field of gas separation, and relates to a pyridine functionalized ionic liquid containing a tertiary amino group on the cation and a nitrile group on the anion, which is applied to SO 2 trapping, through tertiary amino and nitrile groups and SO 2 The synergistic effect between these materials obtains a capture method with high absorption capacity, high selectivity, easy desorption, recyclability and environmental friendliness. Background technique [0002] With the sustained and rapid development of my country's economy and the acceleration of urbanization, my country's atmospheric environment is under serious threat. SO 2 The emissions directly lead to the decline of air environment quality in some areas of our country, causing serious harm to human health, ecological environment and economic development. The "Twelfth Five-Year Plan" stipulates that in 2015, the national SO 2 The total emission should be controlled at 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
Inventor 张香平曾少娟高红帅何宏艳聂毅董海峰张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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