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

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, ...

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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 traditional supergravity device that uses water to absorb ammonia in tail gas, due to the low viscosity of water , the structure of the high-gravity device is not suitable for the efficient dispersion of ionic liquids with high viscosity, and it is not ideal for the separation of ammonia-containing gases in ionic liquid systems

At present, there is no public report on the equipment for the enhanced separation of ammonia-containing gas by spraying and rotating packed bed for ionic liquid system

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