A method for absorbing and separating ammonia from ammonia-containing waste gas

Abstract

The invention discloses a method for absorbing and separating ammonia gas from ammonia-containing exhaust gas. The method comprises the following steps: adopting a hybrid eutectic solvent as an absorbent, the solvent contacting with ammonia-containing exhaust gas to obtain an ammonia-absorbing liquid, and then conducting the desorption of the ammonia-absorbing liquid to obtain ammonia gas. The hybrid eutectic solvent consists of three components, weak acid compounds, salt compounds and additives. The invention adopts the method of absorption and desorption by using the hybrid eutectic solvent as the absorbent to recover and separate ammonia gas. The absorbent has high ammonia solubility and separation selectivity, and can achieve the efficient separation and recovery of ammonia gas.

Description

technical field

[0001] The invention relates to the field of separation, recovery and purification of ammonia-containing waste gas, in particular to a method for absorbing and separating ammonia from ammonia-containing waste gas by using a hybrid deep eutectic solvent. Background technique

[0002] A large amount of ammonia-containing waste gas is produced in chemical processes such as synthetic ammonia production, liquid ammonia storage, and ammonia refrigeration. If it is discharged directly, it will not only pollute the atmosphere and endanger human health, but also cause a huge waste of resources. Therefore, it is of great practical significance to separate and recover ammonia from ammonia-containing waste gas such as synthetic ammonia tail gas.

[0003] Solvent absorption is a common method for separating ammonia from ammonia-containing waste gas, and the absorbent used is mainly water or an aqueous acid solution. The technology of water absorption method is mature, bu...