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Novel efficient and reversible ion type ammonia gas absorbent

An absorbent and ionic technology, applied in the field of Lewis acid ionic liquid, to achieve complete desorption, stable absorption performance and good stability

Active Publication Date: 2015-07-01
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

So far, there has been no report on the absorption and separation of ammonia gas by Lewis acid ionic liquids containing divalent metal cobalt ions in anion.

Method used

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  • Novel efficient and reversible ion type ammonia gas absorbent
  • Novel efficient and reversible ion type ammonia gas absorbent
  • Novel efficient and reversible ion type ammonia gas absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 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, and the dropwise addition is complete Afterwards, the temperature was raised to 70°C, and the reaction was heated under reflux for 48h. Take it out and extract it with ethyl acetate three times, and the ionic liquid phase is removed by a rotary evaporator to remove the residual organic solvent to obtain the [Bmim][Cl] intermediate, which is a white waxy solid at room temperature. [Bmim][Cl] (21.53g, 0.12mol), anhydrous cobalt chloride (8.00g, 0.062mol) and potassium thiocyanate (23.95g, 0.25mol) were dissolved in 50ml of acetone and stirred at room temperature for 24h. After the reaction, acetone was filtered and rotary evaporated, added dichloromethane and placed in the refrigerator for 2 hours, filtered and rotary evaporated again to remove the solvent, and vac...

Embodiment 2

[0018] 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 [Co(NCS) 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 90 minutes. Calculate the ammonia absorption capacity in the ionic liquid to be 0.180g NH 3 / g ionic liquid (6.028mol NH 3 / mol ionic liquid).

[0019] 2) In a self-made absorption bottle with an inner diameter of 3.00cm, add 5.00g of ionic liquid N-butylimidazole thiocyanate [Bmim][SCN], and then pass 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 90 minutes. The calculated...

Embodiment 3

[0021] 1) Add 5.00g of ionic liquid [Emim] into a self-made absorption bottle with an inner diameter of 3.00cm 2[Co(NCS) 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 90 minutes. The calculated ammonia absorption capacity in the ionic liquid is 0.198gNH 3 / g ionic liquid (5.999molNH 3 / mol ionic liquid).

[0022] 2) In a self-made absorption bottle with an inner diameter of 3.00cm, add 5.00g of ionic liquid N-ethylimidazole thiocyanate [Emim][SCN], and then pass 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 90 minutes. The calculated ammonia absorption capacity in the ionic ...

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Abstract

The invention relates to a novel efficient and reversible ion type ammonia gas absorbent and belongs to the technical field of gas separation and purification. The absorbent is Lewis acid ion liquid prepared from pyridine or imidazole and derivative cations thereof and anions containing divalent metal cobalt ions. The absorbent can realize efficient absorption of ammonia gas through the chemical complexing effect between the divalent metal cobalt ions in the anions and ammonia gas molecules and the hydrogen bond effect between the cations and the ammonia gas molecules; and the absorbent has the advantages of good stability, easiness for desorption, capability of being circularly used for a plurality of times and the like, and the novel absorbent is provided for separation and recycling, and purification on the ammonia gas in industrial ammonia-containing tail gas.

Description

technical field [0001] The invention belongs to the technical field of gas separation and purification, and specifically relates to a Lewis acid ionic liquid composed of pyridine or imidazole and its derivative cations and anions containing divalent metal cobalt ions as an absorbent, through divalent metal cobalt ions and ammonia The chemical complexation between gas molecules realizes the efficient and reversible absorption and separation of ammonia. Background technique [0002] Ammonia is one of the typical toxic and harmful industrial gaseous pollutants. It mainly comes from the purge gas of synthetic ammonia production and the exhaust gas of urea prilling tower. In addition, ammonia exists in the process of manufacturing nitrogen fertilizer, nitric acid, hydrocyanic acid, fuel, etc., as well as in the process of producing petroleum products, iron making, and metal surface treatment. A large amount of ammonia-containing industrial tail gas is directly discharged into th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 张香平曾少娟张锁江高红帅董海峰尚大伟李志杰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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