Ammonia-carbon separation process

A technology for ammonia-carbon separation and carbon separation, which is applied in the direction of ammonia preparation/separation, separation method, dispersed particle separation, etc., can solve the problems of high energy consumption, ammonia and carbon dioxide cannot be completely separated, etc., to increase economic benefits and reduce Effect of liquid circulation volume and energy consumption reduction

Active Publication Date: 2016-02-03
BEIJING EDGEIN TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem solved by the present invention is to overcome the defects that ammonia and carbon dioxide cannot be completely separated and consume a lot of energy in the ammonia-carbon separation process in the prior art, and then provide a method that can completely separate the ammonia and carbon dioxide in the mixed gas. Separate and economical ammonia-carbon separation process

Method used

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Examples

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Embodiment 1

[0052] The ammonia-carbon separation process described in the present embodiment comprises the following steps:

[0053] Carbon dioxide absorption step: the mixed gas of ammonia and carbon dioxide enters the carbon dioxide absorption tower from the bottom, and there is a carbon absorbing liquid from the carbon dioxide scrubber at the top of the tower, and the gas and liquid in the tower are in countercurrent contact, and more than 60% of the carbon dioxide is absorbed into the liquid phase and is not absorbed The mixed gas continues to flow upwards and enters the carbon dioxide scrubber. The top of the tower is filled with concentrated ammonia water from the ammonia absorption tower. In the tower, there is carbonized ammonia water condensed by the air cooler from the carbon separation tower and the desorption tower. Water removes the heat of carbon dioxide dissolution reaction in time. The top of the carbon dioxide washing tower obtains crude ammonia with a temperature of 25-4...

Embodiment 2

[0059] In the ammonia-carbon separation process described in this embodiment, the absorption and separation steps of carbon dioxide are the same as in Example 1, and also include ammonia refining steps:

[0060] The crude ammonia gas is sent to the two-stage compressor, the outlet pressure of the first stage is 0.5MPaG, and the outlet pressure of the second stage is 1.7MPaG. The gas compressed by each stage is condensed with circulating water and the tail liquid is separated. , and finally obtain gaseous ammonia with a pressure of not less than 1.5MPaG and a water content of less than 0.1wt%. The gaseous ammonia is sent to the ammonia condenser, and the pure liquid ammonia is obtained through the condensed phase of circulating water, while the residual gas enters the inert washing tower and is desorbed with the desorption liquid. Wash the air until the ammonia content is less than 50ppm, and return the bottom liquid of the inert washing tower and the compressed tail liquid to t...

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Abstract

The invention provides an ammonia-carbon separation process. The process comprises the step of carbon dioxide absorption, wherein a gas mixture sequentially makes contact with carbonized ammonia water and strong ammonia water in a carbon dioxide washing tower, carbon absorbing liquid is formed, the carbon absorbing liquid makes contact with a gas mixture in a carbon dioxide absorption tower, and ammonium carbamate liquid is obtained. According to the process, synergism of the carbon dioxide absorption tower and the carbon dioxide washing tower is initiatively utilized, carbon dioxide is separated from the gas mixture to the greatest extent, to be specific, the carbon dioxide absorption tower adopts the carbon absorbing liquid for absorbing carbon dioxide in the gas mixture, while carbon dioxide washing tower adopts carbonized ammonia water as the main medium and strong ammonia water as the auxiliary medium for precisely absorbing carbon dioxide, therefore the content of carbon dioxide in obtained coarse ammonia gas can be controlled below 50 ppm, then ammonia is separated from the coarse ammonia gas, and finally pure ammonia containing no carbon dioxide or water is obtained. By means of the ammonia-carbon separation process, thorough separation of ammonia and carbon dioxide is achieved in real sense, the ammonia-carbon separation effect is improved, and it is helpful to increase economic benefits.

Description

technical field [0001] The invention relates to the field of gas separation, in particular to a process for separating ammonia and carbon dioxide mixed gas. Background technique [0002] A large amount of mixed gas containing ammonia and carbon dioxide will be produced in the industrial process of synthetic ammonia, urea, melamine, etc. Based on economical and environmental considerations, it is usually necessary to separate the mixed gas into pure ammonia and carbon dioxide. [0003] Since ammonia and carbon dioxide are easily combined to form ammonium bicarbonate, ammonium carbamate and other substances, physical methods such as pressure swing adsorption cannot be used for separation. Therefore, most of the existing ammonia-carbon separation processes form NII by introducing water. 3 -CO 2 -II 2 O ternary system and then separated. However, the phase equilibrium relationship of the ammonia, carbon dioxide, and water ternary system is very complicated, and it does not fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01B31/20C01C1/10C01B32/50
CPCY02C20/40Y02P20/151
Inventor 唐印龚元德宋国天孔德利莫玉馨饶丹匡向东
Owner BEIJING EDGEIN TECH
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