Method for separating ammonia carbon in melamine tail gas

A technology for the separation of melamine and ammonia and carbon, which is applied in separation methods, preparation/separation of ammonia, and separation of dispersed particles. It can solve the problems of cumbersome separation steps, low product recovery rate, large energy and resource consumption, and achieve simplified separation. Steps, protect the environment, improve the effect of conversion rate

Active Publication Date: 2015-03-04
ANHUI JINGHE IND
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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of cumbersome separation steps, low product recovery rate, large energy consumption and large amount of resources in the prior art.

Method used

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  • Method for separating ammonia carbon in melamine tail gas
  • Method for separating ammonia carbon in melamine tail gas

Examples

Experimental program
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Embodiment Construction

[0026] Refer to attached figure 2 :

[0027] a. Absorption: The tail gas sent by the melamine plant with a temperature of 135-136°C is absorbed by adding water through the injector, such as figure 1 As shown, water enters the injector through 1 working medium inlet, and sprays down through 3 nozzles, and contacts and absorbs the melamine tail gas entering from the analytical gas inlet. After further mixing and absorbing through 4 mixing tubes and 5 diffusing tubes, 99% The above ammonia is absorbed to produce low-carbon ammonia water (ammonia: 12~13%, carbon dioxide: 5~6%) and stored in the spray absorption tank; the remaining carbon dioxide tail gas containing a small amount of ammonia is recovered through the scrubber to recover the ammonia in the tail gas , to reduce the ammonia in the tail gas to below 50ppm and vent it.

[0028] b. Distillation: Directly heat the ammonia water at 50-60°C from the spray absorption tank with low-pressure steam at 120-125°C and 0.2MPa. W...

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Abstract

The present invention relates to a method for separating ammonia carbon in melamine tail gas. The method is characterized by comprising absorption, distillation, rectification, decarbonization and other steps. The method has the following advantages that: the low pressure steam produced by the triamine urine washing tower is utilized at a maximum, and the heat of the urine washing tower is recovered by adopting the forced circulation way so as to reduce the steam consumption during the separation process; and the separated water is adopted to replace the desalted water and is supplemented into the urine washing tower steam chest so as to be recycled, such that the apparatus achieves no wastewater discharge so as to provide characteristics of water saving and environment protecting.

Description

technical field [0001] The invention relates to a method for producing melamine, in particular to a method for separating ammonia and carbon in melamine tail gas. Background technique [0002] The main by-products of the melamine production process (called triamine tail gas) are ammonia and carbon dioxide. In the melamine production plant, tail gas absorption has always been a technical problem restricting the production output. With the increase of production capacity, excessive tail gas is produced into ammonium bicarbonate, resulting in a backlog in the market. [0003] Ammonia-carbon separation technology can completely separate tail gas into product liquid ammonia and product carbon dioxide. At present, this technology has attracted more and more attention, because it conforms to the design idea of ​​international large-scale melamine tail gas treatment. At present, there are some separation methods for ammonia and carbon in melamine tail gas in China, such as: [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01C1/12C01B31/20C01B32/50
CPCY02C20/40Y02P20/151
Inventor 姜维强李正华王强
Owner ANHUI JINGHE IND
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