Process for removing carbon dioxide in combined alkali preparation method

A technology of carbon dioxide and combined alkali production, which is applied in the direction of ammonium halide, separation method, carbonate preparation, etc., can solve the problems of short operation period, blockage, and hidden dangers of long-term stable operation, and achieve good absorption effect and smooth operation.

Active Publication Date: 2012-02-15
张志广 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The conventional combined soda production method uses the mother liquor of separated ammonium chloride for the removal of carbon dioxide, and the ammonia mother liquor after absorbing ammonia is used as the decarburization liquid. The temperature of the decarburization liquid is 28-40°C. A cooler needs to be installed inside or outside the decarburization tower. The decarburization liquid in the decarburization tower is cooled by heat exchange with the cooler installed inside or outside. The reaction product sodium bicarbonate is easily affected by the large temperature difference during heat exchange. Accelerated precipitation and deposition on the surface of the decarbonization tower and cooler, resulting in scabbing and blockage of the decarbonization tower and cooler, and short operating cycle, resulting in low removal rate of carbon dioxide and hidden dangers to long-term stable operation

Method used

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  • Process for removing carbon dioxide in combined alkali preparation method

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Effect test

Embodiment 1

[0019] The diameter of the decarbonization tower is 4.6 meters, and the height of the decarbonization tower is 42 meters. The decarbonization liquid enters the decarbonization tower from the upper part, and the tower liquid exits the decarbonization tower from the bottom, and the industrial gas with a carbon dioxide content of 96% enters the decarbonization tower from the lower part. The gas after removing carbon dioxide exits the decarbonization tower from the top, and the carbon dioxide removal rate is 99.68%.

[0020] A1 after ammonia absorption: B after ammonia absorption (volume ratio) = 1:1 to form a decarburization liquid, the temperature is 20.5°C, and the flow rate is: 226 m 3 / h, the composition is shown in the table below:

[0021] project free ammonia fixed ammonia total ammonia total chlorine carbon dioxide components F NH3 C NH3 T NH3 T cl CO 2 unit Mol / l Mol / l Mol / l Mol / l Mol / l quantity 2.588 3.052 5.64 ...

Embodiment 2

[0024] The diameter of the decarbonization tower is 4.6 meters, and the height of the decarbonization tower is 42 meters. The decarbonization liquid enters the decarbonization tower from the upper part, and the tower liquid exits the decarbonization tower from the bottom, and the industrial gas containing 85% carbon dioxide enters the decarbonization tower from the lower part. The gas after removing carbon dioxide exits the decarbonization tower from the top, and the carbon dioxide removal rate is 99.66%.

[0025] A1 after ammonia absorption: B after ammonia absorption (volume ratio) = 0.6:1 to form a decarburization liquid, the temperature is 18.5°C, and the flow rate is: 180.8 m 3 / h, the composition is shown in the table below:

[0026] project free ammonia fixed ammonia total ammonia total chlorine carbon dioxide components F NH3 C NH3 T NH3 T cl CO 2 unit Mol / l Mol / l Mol / l Mol / l Mol / l quantity 2.782 2.676 5.458 5...

Embodiment 3

[0029] The diameter of the decarbonization tower is 4.6 meters, and the height of the decarbonization tower is 42 meters. The decarbonization liquid enters the decarbonization tower from the upper part, and the tower liquid exits the decarbonization tower from the bottom, and the industrial gas with a carbon dioxide content of 22.2% enters the decarbonization tower from the lower part. The gas after removing carbon dioxide exits the decarbonization tower from the top, and the carbon dioxide removal rate is 99.70%.

[0030] A1 after ammonia absorption: B after ammonia absorption (volume ratio) = 1.6:1 to form a decarburization liquid, the temperature is 22.5°C, and the flow rate is: 293.8 m 3 / h, the composition is shown in the table below:

[0031] project free ammonia fixed ammonia total ammonia total chlorine carbon dioxide components F NH3 C NH3 T NH3 T cl CO 2 unit Mol / l Mol / l Mol / l Mol / l Mol / l quantity 2.388 3.132 ...

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Abstract

The invention especially relates to a process for removing carbon dioxide produced in a combined alkali preparation method, which belongs to the technical field of combined alkali preparation methods. The process is as follows: mother liquor obtained after separation of solid sodium bicarbonate from liquid coming out from a decarburization tower is divided into two parts, i.e., A1 and A2, and A1 enters into a mixer after absorbing ammonia; after ammonium chloride is separated from mother liquor used in a procedure for producing ammonium chloride, the mother liquor adsorbs heat and ammonia, impurities of calcium-magnesium ions in the mother liquor are removed, and then the mother liquor is mixed with A1; obtained mixed liquor enters into the decarburization tower after cooling so as to remove carbon dioxide. The process provided in the invention enables a reaction for removing carbon dioxide to be carried out normally under the condition that a built-in or external cooler is not provided, i.e., that no cooling means is needed for heat exchange of decarburization liquid in the decarburization tower from the moment the decarburization liquid enters into the decarburization tower to the moment the decarburization liquid goes out from the decarburization tower; the decarburization tower can stably operate for a long period, with an operational period being more than 60 days; a goodabsorption effect of carbon dioxide is achieved, and a utilization rate reaches more than 99.6%.

Description

technical field [0001] The invention belongs to the technical field of combined soda production, and in particular relates to a carbon dioxide removal process in the combined soda production. Background technique [0002] The conventional combined soda production method uses the mother liquor of separated ammonium chloride for the removal of carbon dioxide, and the ammonia mother liquor after absorbing ammonia is used as the decarburization liquid. The temperature of the decarburization liquid is 28-40°C. A cooler needs to be installed inside or outside the decarburization tower. The decarburization liquid in the decarburization tower is cooled by heat exchange with the cooler installed inside or outside. The reaction product sodium bicarbonate is easily affected by the large temperature difference during heat exchange. Accelerated precipitation and deposition on the surface of the decarburization tower and cooler, resulting in scarring and blockage of the decarbonization to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/18C01C1/16B01D53/78B01D53/62
CPCY02C20/40Y02P20/151
Inventor 张志广
Owner 张志广
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