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Ionic eutectic solvent capable of effectively reversibly absorbing ammonia gas

A deep eutectic solvent and ionic technology, which is applied in gas treatment, separation methods, and dispersed particle separation, can solve the problems of high solvent viscosity and affecting mass transfer, and achieve the effect of simple synthesis, high absorption, and easy desorption

Active Publication Date: 2018-04-13
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

Xing Huabin et al. (ChemSusChem, 2017, 10, 3368) reported that a deep eutectic solvent composed of choline chloride, resorcinol and glycerin absorbs NH 3 , the absorbent is effective for NH at 25°C and 0.10MPa 3 Absorption up to 0.170gNH 3 / gIL, but there are solvents with high viscosity and easy to combine with NH 3 Formation of solids affects issues such as mass transfer and process scale-up

Method used

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  • Ionic eutectic solvent capable of effectively reversibly absorbing ammonia gas
  • Ionic eutectic solvent capable of effectively reversibly absorbing ammonia gas
  • Ionic eutectic solvent capable of effectively reversibly absorbing ammonia gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Add equimolar N-methylimidazole into a round bottom flask and place it in an ice bath, then slowly add equimolar hydrochloric acid dropwise, and magnetically stir for 4 hours after the addition is complete. After the reaction, heat and rotate to remove residual hydrochloric acid and water, wash with ethyl acetate several times, and vacuum dry at 70°C to obtain [Mim][Cl] as a white solid at room temperature. Take 2.9667g [Mim][Cl] and 6.2356g ethylene glycol (EG) and heat and stir at 70°C for 2h to obtain a uniform transparent deep eutectic solvent [Mim][Cl]-EG (1:4); take 2.3533 g[Mim][Cl] and 7.400g ethylene glycol (EG) were heated and stirred at 70°C for 2h to obtain a uniform transparent deep eutectic solvent [Mim][Cl]-EG (1:6); take 2.4239g[ Mim][Cl] and 8.8828g ethylene glycol (EG) were heated and stirred at 70°C for 2h to obtain a homogeneous transparent deep eutectic solvent [Mim][Cl]-EG (1:7).

[0017]2) Add equimolar 2-methylimidazole into a round-bottomed ...

Embodiment 2

[0022] 1) In a self-made absorption bottle with an inner diameter of 2.00cm, add 3.00g of the deep eutectic solvent [Mim][Cl]-EG (1:4) synthesized in 1) in Example 1, and then feed NH 3 , the gas flow rate is 140ml / min, the temperature is 30°C, and the pressure is 0.10MPa. Weigh the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 30 minutes. Calculate the solvent to NH 3 The absorption capacity is 0.160gNH 3 / gsolvent.

[0023] 2) In a self-made absorption bottle with an inner diameter of 2.00cm, add 3.00g of the deep eutectic solvent [Mim][Cl]-EG (1:6) synthesized in 1) in Example 1, and then feed NH 3 , the gas flow rate is 140ml / min, the temperature is 30°C, and the pressure is 0.10MPa. Weigh the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 30 minutes. Calculate the solvent to NH 3 The absorption capacity is 0.163gNH 3 / gsolve...

Embodiment 3

[0026] 1) In a self-made absorption bottle with an inner diameter of 2.00cm, add 3.00g of the deep eutectic solvent [2Mim][Cl]-EG(1:4) synthesized in 2) in Example 1, and then feed NH 3 , the gas flow rate is 140ml / min, the temperature is 30°C, and the pressure is 0.10MPa. Weigh the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 30 minutes. Calculate the solvent to NH 3 The absorption capacity is 0.179gNH 3 / gsolvent.

[0027] 2) In a self-made absorption bottle with an inner diameter of 2.00cm, add 3.00g of the deep eutectic solvent [Mmim][Cl]-EG(1:4) synthesized in 3) in Example 1, and then feed NH 3 , the gas flow rate is 140ml / min, the temperature is 30°C, and the pressure is 0.10MPa. Weigh the absorption bottle at regular intervals until the mass does not change, and the absorption reaches equilibrium in about 30 minutes. Calculate the solvent to NH 3 The absorption capacity is 0.160gNH 3 / gsolve...

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Abstract

The invention relates to an ionic eutectic solvent capable of effectively reversibly absorbing ammonia gas, and belongs to the technical field of gas separation and purification. The eutectic solventis formed by proton-type imidazole ionic liquid as a hydrogen-bond acceptor and polyol as a hydrogen-bond donor; therefore, raw materials are rich and are easy to get, a synthetic process is simple, and large scale preparation is convenient to carry out; moreover, because of a multi-site hydrogen bond effect among hydrogen protons in ionic liquid, a hydroxyl group in the polyol and NH3 molecules,high-efficient absorption of NH3 is facilitated; by adopting a heating or pressure reduction way, the NH3 can be completely desorbed out, and a regenerated absorbing agent can be recycled, and the absorption performance keeps stable. The solvent has the advantages of simple synthesis, low viscosity, good stability, high NH3 absorption quantity, easiness for desorption, recyclability and the like,therefore, the solvent is an absorbing agent which extremely has application prospects and can perform purification and separation on the NH3.

Description

technical field [0001] The invention belongs to the technical field of gas separation and purification, and specifically relates to a deep eutectic solvent composed of a proton-type imidazole ionic liquid as a hydrogen bond acceptor and a polyhydric alcohol as a hydrogen bond donor as an absorbent. The multi-site hydrogen bond interaction with ammonia molecules realizes the efficient and reversible purification and separation of ammonia. Background technique [0002] Ammonia (NH 3 ) is one of the typical toxic and harmful industrial gaseous pollutants. Industrial ammonia emissions mainly come from the tail gas produced in the production process of synthetic ammonia, urea, cyanuric acid, inorganic chemical industry (ammonium molybdate, molybdenum oxide) (ammonia content 500 ~ 20000mg / m 3 ), as well as coke oven gas, ammonia refrigeration tank exhaust, nitric acid plant tail gas, etc. A large amount of ammonia-containing tail gas is directly discharged into the atmosphere,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1493B01D2253/25B01D2257/406
Inventor 曾少娟张香平尚大伟董海峰冯建朋张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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