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Metal ion liquid absorber having effect of efficiently and reversibly absorbing ammonia gas

A technology of liquid absorbent and metal ions, which is applied in gas treatment, separation methods, and separation of dispersed particles, etc., can solve the problems of poor heat transfer performance and circulation, and achieve improved absorption performance, high absorption capacity, and good stability Effect

Inactive Publication Date: 2017-07-04
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

In order to further improve the NH 3 The absorption capacity, considering that metal chlorides have the NH 3 High adsorption capacity, but poor heat transfer performance and cyclicity, the present invention combines ionic liquids with metal chlorides, and proposes a cation composed of pyridine or imidazole and its derivatives and different metal chloride complexes as Novel ionic liquid absorbent composed of anions, using metal ions and NH 3 The chemical complexation between cations, chloride ions and NH 3 Interactions such as hydrogen bonds, and jointly realize the pairing of NH 3 High-efficiency reversible absorption, is a very promising absorbent for ammonia recovery

Method used

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  • Metal ion liquid absorber having effect of efficiently and reversibly absorbing ammonia gas
  • Metal ion liquid absorber having effect of efficiently and reversibly absorbing ammonia gas
  • Metal ion liquid absorber having effect of efficiently and reversibly absorbing ammonia gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) Add 1mol of N-methylimidazole into a 500mL three-necked round-bottomed flask with a condenser, stir it magnetically to raise the reaction temperature to 65°C, then slowly add 1.05mol of n-chlorobutane dropwise, dropwise After the addition, the temperature was raised to 70°C, and the reaction was heated to reflux for 48h. Take out and extract three times with ethyl acetate, and the ionic liquid phase is removed by a rotary evaporator to remove residual organic solvents to obtain a white waxy solid [Bmim][Cl] at room temperature. Take [Bmim][Cl] (20.96g, 0.12mol) and anhydrous copper chloride (8.34g, 0.062mol) and stir at 70°C for 24h. After the reaction, wash with acetone, filter and rotary evaporate, and vacuum dry at 70°C for 48 hours to obtain viscous liquid [Bmim] 2 [CuCl 4 ].

[0015] 2) Add 1mol of pyridine into a 500mL three-neck round bottom flask with a condenser, stir it magnetically to raise the reaction temperature to 65°C, then slowly add 1.05mol of n-...

Embodiment 2

[0018] Determination by thermogravimetric analyzer [Bmim] 2 [CuCl 4 ],[Bmim] 2 [SnCl 4 ],[Bmim] 2 [NiCl 4 ], [Bmim][ZnCl 3 ] and [Bmim]Cl five kinds of ionic liquid thermal decomposition temperature, test conditions: from room temperature to 600 ℃, N 2 atmosphere, the heating rate is 10°C / min, and the decomposition temperatures are 220°C, 240°C, 286°C, 331°C and 205°C, respectively, and the thermal stability of the metal ionic liquid is significantly improved.

Embodiment 3

[0020] 1) In a self-made absorption bottle with an internal diameter of 3.00cm, add 5.00g of the ionic liquid [Bmim] synthesized in 1) in Example 1 2 [CuCl 4 ], and then into pure NH 3 , the gas flow rate is 140ml / min, the temperature is 30°C, and the pressure is 0.1MPa. Take the weight of the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 5 hours. The calculated ammonia absorption capacity in the ionic liquid is 0.172g NH 3 / g ionic liquid (4.892mol NH 3 / mol ionic liquid).

[0021] 2) In the self-made absorption bottle that internal diameter is 3.00cm, add 5.00g embodiment 1 in 2) the ionic liquid [C] synthesized 4 Py] 2 [CuCl 4 ], and then into pure NH 3 , the gas flow rate is 140ml / min, the temperature is 30°C, and the pressure is 0.1MPa. Take the weight of the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 5 hours. The cal...

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Abstract

The invention relates to a metal ion liquid absorber having an effect of efficiently and reversibly absorbing ammonia gas and belongs to the technical field of gas separation and purification. The metal ion liquid absorber is a metal ion liquid composed of pyridine or imidazole and its derivatives as cations and different metal chlorinated complexes as anions. Through chemical complexation effects of metal ions and ammonia gas and hydrogen bonding of cations and chloride ions to ammonia gas, the metal ion liquid absorber realizes efficient absorption of ammonia gas, has good stability, can be recycled several times and is a novel ammonia gas purification separation absorber having an industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of gas separation and purification, and specifically relates to a metal ionic liquid composed of pyridine or imidazole and its derivatives as cations and different metal chloride complexes as anions. The chemical complexation, as well as the hydrogen bond between cations, chloride ions and ammonia, jointly realize the efficient and reversible absorption and separation of ammonia. Background technique [0002] Ammonia (NH 3 ) is a colorless gas with a strong pungent odor, which is extremely harmful to the human body and the environment. Ammonia content greater than 0.02% in the air will cause chronic poisoning to the human body. When exposed to ammonia vapor with a concentration of 400ppm for a long time, it will damage the mucous membrane, and cause cough, dyspnea and vomiting due to irritation of the nose and throat. Studies have shown that ammonia emissions in the atmosphere are one of the main causes o...

Claims

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Application Information

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IPC IPC(8): B01D53/14C07D213/127C07D213/20C07D233/58
CPCB01D53/1493B01D2257/406C07D213/127C07D213/20C07D233/58
Inventor 张香平曾少娟王均利尚大伟高红帅董海峰张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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