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Method for recovering ammonia from ammonia-containing gas based on ionic liquid

A technology of ammonia-containing gas and ionic liquid, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of high cost, low recovery rate of ammonia absorbed by water, pollution by water absorption, etc., and achieves easy promotion and installation The effect of simple structure and small equipment investment

Inactive Publication Date: 2011-09-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the serious problems such as the low recovery rate of ammonia absorbed by the existing water, the concentration of ammonia water being too dilute to handle, and the serious problems such as excessive ammonia nitrogen in the discharged sewage and environmental pollution, the present invention proposes a method based on ionic liquids to recover ammonia in ammonia-containing gas. The new technology can solve the problems of serious water absorption pollution and high cost

Method used

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  • Method for recovering ammonia from ammonia-containing gas based on ionic liquid
  • Method for recovering ammonia from ammonia-containing gas based on ionic liquid
  • Method for recovering ammonia from ammonia-containing gas based on ionic liquid

Examples

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Embodiment 1

[0027] Using the above-mentioned embodiment, the flow rate of synthetic ammonia release gas is 516.35kg / h, the mass fraction of ammonia is 4.4%, the pressure is 60atm, and the temperature is -8°C; the ionic liquid [C 4 MIM][BF 4 ] The feed flow rate is 2000kg / h, the pressure is 59atm, and the temperature is 30°C; the operating pressure of the absorption tower is 59atm~60atm. The ammonia-rich liquid enters the secondary flash tank to flash non-condensable gas, and the flash temperature is 60°C; then enters the secondary flash tank to recover ammonia, and the flash temperature is 100°C; the desorbed lean liquid is compressed to 59atm, then cooled to 30°C, and then enters the absorption tower for cyclic absorption. The absorption of ammonia is 22.275kg / h, the recovery rate of ammonia is 97.1%; the recycling rate of ionic liquid is 1999.929kg / h, the recovery rate of ionic liquid is 99.99%, and the mass concentration of ammonia in the desorbed ionic liquid is 35ppm. Examples The ...

Embodiment 2

[0032] Adopt above-mentioned embodiment, the flow rate of synthetic ammonia release gas is 516.35kg / h, the mass fraction of ammonia is 4.4%, the pressure is 60atm, temperature-8 ℃; Composite solvent feed flow rate is 2100kg / h, ionic liquid [C 4 MIM][BF 4 ] mass fraction 95.2% polyethylene glycol mass fraction 4.8%, pressure 59atm, temperature 20°C. The ammonia-rich liquid enters the secondary flash tank to flash non-condensable gas, and the flash temperature is 60°C; then enters the secondary flash tank to recover ammonia, and the flash temperature is 100°C; the desorbed lean liquid is compressed to 59atm, then cooled to 20°C, and then enters the absorption tower for cyclic absorption. The absorption of ammonia is 21.733kg / h, the recovery rate of ammonia is 95.7%; the recycling rate of ionic liquid is 1999.929kg / h, the recovery rate of ionic liquid is 99.99%, and the mass concentration of ammonia in the desorbed ionic liquid is 35ppm. The results of the examples are shown in...

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Abstract

The invention relates to a method for recovering ammonia from ammonia-containing gas based on ionic liquid, which can solve the problems that a solvent is easy to volatilize, the energy consumption is high, the volume is small, wastewater is discharged and the like in the conventional method for recovering ammonia from ammonia-containing gas through water absorption. An absorption device recovers the ammonia from the ammonia-containing gas by taking the ionic liquid or a composite solvent as an absorbent; and the method comprises the following steps of: desorbing most noncondensable gas from ammonia-containing rich liquid through single stage or multiple stages of flash evaporation; and further performing flash evaporation to recover ammonia from the absorbent, and making the desorbed ionic liquid absorbent subjected to pressurization and temperature reduction enter the absorption device to circularly absorb the ammonia in the ammonia-containing gas. The recovery rate of ammonia is over 95 percent; and the process has the characteristics of environmental friendliness, low energy consumption, simple equipment, convenience of operation and the like.

Description

Technical field: [0001] The invention relates to an ionic liquid-based recovery method for ammonia in ammonia-containing gas, belonging to the field of waste gas treatment and recovery. Specifically, it relates to a new process for recovering ammonia from ammonia-containing gases using ionic liquids. Background technique: [0002] Ammonia is one of the typical odorous, toxic and harmful industrial gaseous pollutants. It mainly comes from the exhaust gas from the production of synthetic ammonia and the high-altitude exhaust gas from the urea prilling tower. Other sources include coke oven gas, ammonia refrigeration tank exhaust, nitric acid plant tail gas and In industrial production, more than 80% of the ammonia waste gas comes from the exhaust gas of synthetic ammonia in the running, running, dripping, and leaking of equipment. A large amount of ammonia-containing industrial tail gas is directly discharged into the atmosphere, which not only causes the loss of synthetic am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 张香平陈晏杰任保增王蕾田肖董海峰聂毅周清姚月华张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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