Method for absorbing and separating ammonia gas from ammonia-containing exhaust gas
A waste gas and ammonia gas technology, applied in separation methods, preparation/separation of ammonia, separation of dispersed particles, etc., can solve the problems of low added value of ammonium salt products, high energy consumption in the water regeneration process, and large consumption of separation materials, etc., to achieve Strong ammonia molecular affinity and selective recognition ability, low saturated vapor pressure, efficient removal and recovery effects
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Embodiment 1
[0037]The absorbent is a hybrid deep eutectic solvent mixed with hydroquinone / choline chloride / ethylene glycol (molar ratio 3:1:3). Synthetic ammonia tail gas composition (volume percentage): hydrogen 51.8%, nitrogen 19.3%, ammonia 6.5%, argon 3.6%, methane 18.8%. The tail gas of synthetic ammonia enters from the bottom of the absorption tower at 3.8MPa, and the absorbent is added to the top of the absorption tower, and the absorbent is in countercurrent contact with the tail gas of synthetic ammonia for absorption at 30°C to ensure that most of the ammonia is absorbed, and the bottom of the tower is enriched. Ammonia absorption liquid, insoluble nitrogen, hydrogen, methane and other residual tail gases are obtained at the top of the tower.
[0038] The absorption liquid at the bottom of the tower enters the desorption tower, adopts the method of temperature rise and desorption, the desorption temperature is controlled at 70°C, the pressure is 0.3MPa, ammonia gas is obtained f...
Embodiment 2
[0040] The absorbent is a hybrid deep eutectic solvent mixed with resorcinol / choline chloride / glycerol (molar ratio 3:1:5). Synthetic ammonia tail gas composition: hydrogen 59.5%, nitrogen 22.3%, ammonia 5.3%, argon 3.8%, methane 9.1%. As in Example 1, countercurrent contact and absorption with the absorbent at 20°C and 4.0 MPa, desorb ammonia gas from the absorbing liquid at 65°C and 0.2 MPa, and the absorbent at the bottom of the tower is recovered and recycled. The recovery rate of ammonia can reach 99.1%.
Embodiment 3
[0042] The absorbent is a hybrid deep eutectic solvent mixed with phloroglucinol / tetrabutylammonium chloride / 1,2-propanediol (molar ratio 2:1:4). Composition of synthetic ammonia tail gas: hydrogen 56.1%, nitrogen 20.5%, ammonia 3.9%, argon 4.7%, methane 14.8%. As in Example 1, countercurrent contact and absorption with the absorbent at 20°C and 3.5MPa, the absorption liquid is heated and decompressed at 65°C and 0.08MPa to desorb ammonia gas, and the absorbent is recovered and recycled at the bottom of the tower. The recovery rate of ammonia can reach 99.5%.
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