A method for removing trace ammonia in carbon monoxide

Abstract

The present invention discloses a method for removing trace ammonia in carbon monoxide, comprising the following steps: (1) introducing carbon dioxide and trace water vapor in an appropriate proportion into carbon monoxide containing ammonia; (2) pressurizing the gas to be treated to 3.0MPa-6.0MPa; (3) during the pressurization process, due to the liquefaction of water vapor, ammonia in the carbon monoxide containing ammonia reacts with the added carbon dioxide to generate a certain amount of ammonium carbonate, ammonium bicarbonate and micron-sized ammonium carbonate salt solid particles; (4) the airflow after the reaction passes through a bag dust removal system to remove the ammonium salt solid particles and recover pure carbon monoxide. The present invention achieves the purpose of purifying carbon monoxide by introducing carbon dioxide into the carbon monoxide containing ammonia to generate ammonium carbonate salt and precipitate it, thereby removing ammonia in the carbon monoxide, and effectively removing ammonia in the carbon monoxide without generating ammonia-containing wastewater. The carbon monoxide purified by the present invention has an ammonia content of less than 200ppm, and the purification effect is obvious.

Description

Technical Field

[0001] The invention relates to the field of gas purification, in particular to a method for removing trace ammonia in carbon monoxide. Background Art

[0002] In some chemical process, carbon monoxide will be mixed with ammonia, resulting in reduced purity of carbon monoxide and inability to use normally. For example, in the decomposition of carbonyl iron, ammonia carrier gas will be introduced, resulting in the decomposed carbon monoxide being unable to be recycled. Currently, most of the ammonia is removed by water washing. In this process, water washing produces a large amount of industrial ammonia-containing wastewater, which is not conducive to clean production. Summary of the invention

[0003] The purpose of the present invention is to provide a method for removing trace ammonia in carbon monoxide, thereby solving the problem of generating ammonia-containing wastewater during the purification process.

[0004] In order to achieve the above objectives, the following technical solutions are provided:

[0005] A method for removing trace ammonia in carbon monoxide comprises the following steps:

[0006] (1) introducing carbon dioxide and a trace amount of water vapor in an appropriate proportion into the gas to be purified containing ammonia and carbon monoxide;

[0007] (2) pressurizing the gas to be treated to 3.0 MPa-6.0 MPa;

[0008] (3) During the pressurization process, due to the liquefaction of water vapor, ammonia in the gas to be purified reacts with the added carbon dioxide to generate a certain amount of ammonium carbonate, ammonium bicarbonate and micron-sized ammonium carbonate salt solid particles;

[0009] (4) The airflow after the reaction passes through a bag dust removal system to remove solid particles of ammonium carbonate salt, and a carbon monoxide gas recovery device is used to recover pure carbon monoxide.

[0010] Preferably, the molar ratio of ammonia to carbon dioxide is controlled between 1:1 and 1:2 to ensure complete reaction of carbon dioxide and ammonia.

[0011] Preferably, the molar ratio of trace water vapor to ammonia is less than 1:15, so that water can be retained in the solid carbonate in the form of crystal water or adsorption as much as possible.

[0012] The beneficial effects of the present invention are:

[0013] The present invention uses the characteristics of the reaction between ammonia and carbon dioxide to introduce carbon dioxide into ammonia-containing carbon monoxide to generate ammonium carbonate and precipitate it, thereby removing ammonia in the carbon monoxide and achieving the purpose of purifying carbon monoxide. The present invention can effectively remove ammonia in carbon monoxide without generating ammonia-containing wastewater. The carbon monoxide purified by the present invention has an ammonia content of less than 200 ppm, and the purification effect is obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the process structure of the present invention; DETAILED DESCRIPTION

[0015] The design scheme is described in detail below with reference to the accompanying drawings.

[0016] like Figure 1 As shown, a method for removing trace ammonia in carbon monoxide comprises the following steps:

[0017] (1) introducing carbon dioxide and a trace amount of water vapor in an appropriate proportion into the gas to be purified containing ammonia and carbon monoxide;

[0018] (2) pressurizing the gas to be treated to 3.0 MPa-6.0 MPa;

[0019] (3) During the pressurization process, due to the liquefaction of water vapor, ammonia in the gas to be purified reacts with the added carbon dioxide to generate a certain amount of ammonium carbonate, ammonium bicarbonate and micron-sized ammonium carbonate salt solid particles;

[0020] (4) The airflow after the reaction passes through a bag dust removal system to remove solid particles of ammonium carbonate salt, and a carbon monoxide gas recovery device is used to recover pure carbon monoxide.

[0021] Example 1

[0022] like Figure 1 As shown, a suitable ratio of carbon dioxide and a trace amount of water vapor is introduced into the gas to be purified, and the molar ratio of ammonia to carbon dioxide is controlled at 1:15 to ensure complete reaction of carbon dioxide and ammonia; the molar ratio of trace water vapor to ammonia is 1:20, so that water is retained in the solid carbonate in the form of crystalline water or adsorption as much as possible; (2) the gas to be treated is pressurized to 5.0 MPa; (3) during the pressurization process, due to the liquefaction of water vapor, ammonia in the gas to be purified reacts with the added carbon dioxide to generate micron-sized ammonium carbonate solid particles; (4) the airflow after the reaction passes through a bag dust removal system to remove the ammonium salt solid particles and recover pure carbon monoxide.

[0023] Example 2

[0024] like Figure 1As shown, a suitable ratio of carbon dioxide and a trace amount of water vapor is introduced into the gas to be purified, and the molar ratio of ammonia to carbon dioxide is controlled at 1:1 to ensure that carbon dioxide and ammonia react completely; the molar ratio of trace water vapor to ammonia is 1:20, so that water is retained in the solid carbonate in the form of crystalline water or adsorption as much as possible; (2) the gas to be treated is pressurized to 3.0 MPa; (3) during the pressurization process, due to the liquefaction of water vapor, ammonia in the gas to be purified reacts with the added carbon dioxide to generate micron-sized ammonium carbonate solid particles; (4) the airflow after the reaction passes through a bag dust removal system to remove the ammonium salt solid particles and recover pure carbon monoxide.

[0025] Example 3

[0026] like Figure 1 As shown, a suitable ratio of carbon dioxide and a trace amount of water vapor is introduced into the gas to be purified, and the molar ratio of ammonia to carbon dioxide is controlled at 1:2 to ensure that carbon dioxide and ammonia react completely; the molar ratio of trace water vapor to ammonia is 1:20, so that water is retained in the solid carbonate in the form of crystalline water or adsorption as much as possible; (2) the gas to be treated is pressurized to 6.0 MPa; (3) during the pressurization process, due to the liquefaction of water vapor, ammonia in the gas to be purified reacts with the added carbon dioxide to generate micron-sized ammonium carbonate solid particles; (4) the airflow after the reaction passes through a bag dust removal system to remove the ammonium salt solid particles and recover pure carbon monoxide.

Claims

1. A method for removing trace ammonia in carbon monoxide, characterized in that: The following steps are involved: (1) introducing carbon dioxide and a trace amount of water vapor in an appropriate proportion into the gas to be purified containing ammonia and carbon monoxide; (2) Pressurize the gas to be treated to 3.0MPa-6.0MPa; (3) During the pressurization process, due to the liquefaction of water vapor, ammonia in the gas to be purified reacts with the added carbon dioxide to form micron-sized ammonium carbonate solid particles; (4) The airflow after the reaction passes through a bag dust removal system to remove solid particles of ammonium carbonate salt, and a carbon monoxide gas recovery device is used to recover pure carbon monoxide; The molar ratio of ammonia to carbon dioxide is controlled between 1:1 and 1:2 to ensure complete reaction of carbon dioxide and ammonia; The molar ratio of the trace water vapor to ammonia is less than 1:15, so that water is retained in the solid ammonium carbonate salt solid particles in the form of crystal water or adsorption as much as possible.

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