A process for urea tail gas deamination
CN117258510BActive Publication Date: 2026-02-27ANHUI HAOYUAN CHEM IND GRP
Patent Information
- Application Number
- CN202311090441.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2043-08-28
AI Technical Summary
Technical Problem
In the existing technology for treating urea tail gas, the reaction between ammonia and carbon dioxide leads to a complex composition of solutes in the absorption tower, increasing the cost of purifying by-products.
Method used
A diaphragm tube separator is used to separate ammonia from alkaline solution in urea tail gas. Ammonium sulfate byproduct is generated by reacting with concentrated sulfuric acid. Impurity gases are removed through compression and filtration steps, thus achieving efficient separation and purification of ammonia.
Benefits of technology
It effectively removes impurities such as carbon dioxide from urea tail gas, and produces high-purity ammonium sulfate, reducing the cost of purifying by-products.
✦ Generated by Eureka AI based on patent content.
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Figure CN117258510B_ABST
Abstract
The application discloses a process for urea tail gas deamination, and belongs to the technical field of tail gas treatment. Urea tail gas in a urea synthesis tower is compressed through a first compressor, then filtered through a first caustic soda filter to remove carbon dioxide gas in the urea tail gas, and pretreated tail gas is obtained. The pretreated tail gas is introduced into lye in an alkaline separator, ammonia gas is separated through a diaphragm tube under the blowing of compressed nitrogen gas, and dilute gas is obtained. The dilute gas is introduced into an acid absorption tower, and reaction is carried out to obtain an ammonium sulfate byproduct. The process can effectively remove impurity gases such as carbon dioxide gas in the urea tail gas. The solubility of ammonia gas in the first cavity in a saturated sodium hydroxide solution is small, the ammonia gas escapes and passes through the diaphragm tube, a negative pressure is formed in a second cavity of the alkaline separator under the blowing of nitrogen gas, and the ammonia gas is helpful to be taken away. After being diluted by nitrogen gas, the ammonia gas fully reacts with concentrated sulfuric acid, the ammonia gas is excessive, and the generated ammonium sulfate has few impurities and high purity.
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Citation Information
Patent Citations
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