Method for absorbing and separating ammonia-containing gas by using supergravity enhanced ionic liquid

An ionic liquid and ammonia-containing gas technology, which is applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of unsatisfactory separation of ammonia-containing gas, and achieve improved gas-liquid mixing effect, stable operation, and residence time. short effect

Inactive Publication Date: 2021-06-29
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many related studies on ammonia gas separation. Patents CN202010730173.4, CN202020688591.7 and CN202010905721.2 disclose ammonia absorption and separation devices based on water washing and pickling methods, mainly using traditional packed tower structures; patent CN202020487303.1 proposes A utility model of falling film ammonia absorber was developed, which increases the absorption efficiency by increasing the gas-liquid contact area; patent 201711097792.9 discloses a tradit

Method used

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  • Method for absorbing and separating ammonia-containing gas by using supergravity enhanced ionic liquid

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Experimental program
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Effect test

Embodiment 1

[0019] The ammonia concentration in the imported gas composition is 0.5%, and the gas pressure is 1.5atm. The ionic liquid used for absorption is proton type ionic liquid 1-butylimidazole bistrifluoromethanesulfonimide salt ([Bim][NTf 2 ]). The inner packing of the rotor of the spraying rotary packed bed is stainless steel wire mesh packing, and the rotating speed of the rotor is adjusted to 3000 rpm. The ionic liquid at a temperature of 30°C is sprayed into the packing of the rotating packed bed through a liquid sprayer. The quantity of the liquid distribution atomizer is 1, and the pipe diameter is 20mm. The atomizer is equipped with 4 layers of solid conical nozzles, and 6 nozzles are evenly distributed in the upper single layer. The gas-liquid ratio used is 200:1, and the gas-liquid contacts in countercurrent in the reactor. Ammonia removal efficiency reaches 90%. The absorbed ionic liquid was desorbed at 91°C and 10kPa and reused.

Embodiment 2

[0021] The ammonia concentration in the imported gas composition is 5%, and the gas pressure is 13 atm. The absorbent is a compound solution of hydroxyl-type ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium dicyanamide ([EtOHmim][DCA]) and ethylene glycol in a mass ratio of 7:3. The rotor speed is 2850 rpm. The temperature of the absorbent is 20°C, the number of atomizers is 8, the pipe diameter is 10mm, and 3 layers of solid conical nozzles are installed, and 6 nozzles are evenly distributed in the upper single layer. The gas-liquid ratio used is 50:1, and the gas-liquid contacts in countercurrent in the reactor. Ammonia gas removal efficiency reaches 95%.

Embodiment 3

[0023] The ammonia concentration in the imported gas composition is 20%, and the gas pressure is 8 atm. The ionic liquid used for absorption is metal type ionic liquid 1-butyl-3-methylimidazole cobalt thiocyanate ([Bmim] 2 [Co(NCS)] 4 ). The rotor filler is polypropylene wire mesh filler, and the rotor speed is 2700 rpm. The temperature of the ionic liquid is 30°C, the distribution of liquid mist is 8, the pipe diameter is 30mm, 4 layers of hollow cone nozzles are installed, and 4 nozzles are evenly distributed in the upper single layer. The gas-liquid ratio is 200:1, and the ammonia gas removal efficiency reaches 96%.

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Abstract

The invention relates to a method for absorbing and separating ammonia-containing gas by adopting supergravity enhanced ionic liquid. The method is suitable for absorbing and separating ammonia in industrial ammonia-containing gas such as synthetic ammonia purge gas, melamine tail gas, non-ferrous metal chemical tail gas and the like. According to the method, an atomizing and supergravity environment is provided by utilizing a spray rotating packed bed, and ammonia-containing gas and an ionic liquid absorbent are introduced into the spray rotating packed bed according to a certain proportion at a certain temperature and pressure; and the ionic liquid absorbent and the ammonia-containing gas are in countercurrent/cross-flow contact in the spray rotating packed bed, so that the phase contact area and the interface update rate of the ionic liquid absorbent and the ammonia-containing gas are enhanced, the problem of low mass transfer rate caused by high viscosity of the ionic liquid is solved, and efficient selective absorption of the ionic liquid to ammonia is realized. By adopting the method, the absorption efficiency of ammonia can reach more than 90%. Compared with a traditional packing absorption tower, the method has the advantages of small equipment size, high mass transfer efficiency, low investment and the like.

Description

【Technical field】 [0001] The invention relates to the technical field of separation of ammonia-containing gas in various process gases and production tail gas, and proposes a new method for absorbing and separating ammonia gas by using a high-gravity spray rotating packed bed. The method can selectively absorb ammonia, realize efficient purification and separation of ammonia-containing gas, and can be widely used in the absorption and separation of ammonia in industrial ammonia-containing gases such as synthetic ammonia off-gas, melamine tail gas, and non-ferrous metal chemical tail gas. 【Background technique】 [0002] Ammonia (NH 3 ) is an inorganic compound with a strong pungent odor, which is widely used in various fields such as chemical industry, pharmaceuticals, agriculture and polymer material industry. The global NH 3 Total production has continued to rise over the past few decades. At present, industrial ammonia waste gas mainly comes from the production process, ...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/18
CPCB01D53/1493B01D53/18B01D53/185B01D2252/30B01D2257/406
Inventor 董海峰张露王锦波孙福顺胡宗元曾少娟白璐张香平张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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