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Method for producing sodium hydrogen carbonate and ammonium sulfate by using sodium sulfate solution

A technology of sodium sulfate solution and sodium bicarbonate, applied in chemical instruments and methods, carbonate preparations, ammonia compounds, etc., can solve the problems of low gas absorption utilization rate, lower raw material utilization rate, and difficulty in ammonia gas treatment, and achieve The effect of saving equipment, high utilization rate of raw materials, and low residual ammonia and carbon dioxide

Active Publication Date: 2018-05-18
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its gas absorption and utilization rate is low, ammonium bicarbonate is severely decomposed, resulting in a reduction in the utilization rate of raw materials, and it is difficult to deal with pollutants such as ammonia gas that is discharged randomly, which is easy to cause environmental pollution

Method used

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  • Method for producing sodium hydrogen carbonate and ammonium sulfate by using sodium sulfate solution
  • Method for producing sodium hydrogen carbonate and ammonium sulfate by using sodium sulfate solution
  • Method for producing sodium hydrogen carbonate and ammonium sulfate by using sodium sulfate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Take 100kg of sodium sulfate solution obtained by sodium desulfurization, which contains 27.1% (1.91mol / L) of sodium sulfate, 2.37% of sodium bicarbonate, 0.4% of sodium chloride, and 70.14% of water. The solution is cooled at 0°C and sent to the absorption The tower is sprayed, and at the same time, 0.483kg of ammonia and 1.25kg of carbon dioxide obtained by distilling ammonia are sent to the bottom of the absorption tower. The obtained absorption liquid contained 25.26 kg of sodium sulfate.

[0074] Control the temperature in the mixer to 0°C, send the absorption liquid into the mixer, and add 28.1 kg of ammonium bicarbonate and frozen ammonium bicarbonate / sodium sulfate mixed salt to the mixer to obtain a mixed slurry, which is pumped into In the reactor, the temperature was raised to 38°C, the pressure was raised to 0.14MPa, and the reaction was carried out for 1.5 hours to obtain the heavy alkali and the reaction mother liquor. The composition of the obtained heavy...

Embodiment 2

[0083] Get sodium sulfate solution 110kg, wherein contain sodium sulfate 27.2%, sodium bicarbonate 2.47%, sodium chloride 0.3%, water 70.24%. After the solution is cooled at 0°C, it is sent to the absorption tower for spraying, and at the same time, the ammonia and carbon dioxide obtained from ammonia distillation are sent to the bottom of the absorption tower. The obtained absorption liquid contained 25.35 kg of sodium sulfate.

[0084] Control the temperature in the mixer to 0°C, send the absorption liquid into the mixer, and add 27.89 kg of ammonium bicarbonate to the mixer and cool the resulting ammonium bicarbonate / sodium sulfate mixed salt to obtain a mixed slurry, and send the mixed slurry into In the reactor, raise the temperature to 37°C, raise the pressure to 0.14MPa, and react for 1.5 hours to obtain heavy alkali and reaction mother liquor. The composition of the obtained heavy alkali is shown in Table 6.

[0085] Table 6 heavy alkali composition

[0086] ...

Embodiment 3

[0092] Get lithium carbonate to produce sodium sulfate by-product 100kg, and its composition is as shown in table 8. Use 57.6kg of water to absorb the ammonia and carbon dioxide obtained by distilling ammonia at 5°C; control the temperature in the mixer to 5°C, send the absorption liquid into the mixer and add 100kg of sodium sulfate by-product, 52.7kg of ammonium bicarbonate solid and sulfuric acid The mixed slurry of sodium / ammonium bicarbonate mixed salt was pumped into the reactor, and the pressure was increased to 0.14MPa at 38°C, and the sodium bicarbonate was separated after 2 hours of reaction. Sodium bicarbonate one-way output is 35.33kg, and its composition is as shown in table 9 below. The filtrate after the separation of sodium bicarbonate is carried out after the processing steps such as crystallization, evaporation, cooling identical with embodiment 1, isolate the ammonium sulfate product, and its composition is as shown in table 10:

[0093] Table 8 Lithium car...

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Abstract

The invention relates to a method for producing sodium hydrogen carbonate and ammonium sulfate by using a sodium sulfate solution, and belongs to the technical field of chemical engineering. The method comprises the following steps: a, absorbing circulating gas by using the sodium sulfate solution at -5 to 10 DEG C to obtain absorbing liquid; b, mixing the absorbing liquid, ammonium hydrogen carbonate and / or mixed salt at -5 to 20 DEG C to obtain mixed slurry; c, performing sealed reaction on the mixed slurry to obtain sodium hydrogen carbonate and reaction mother liquid; d, mixing the reaction mother liquid and complex salt to obtain salt mixture and primary frozen mother liquid after freezing; e, distilling the primary frozen mother liquid to obtain carbon dioxide, ammonium circulating gas and ammonium steaming mother liquid; f, adjusting the ammonium steaming mother liquid by acid to obtain an acidified solution and gas; g, mixing and freezing the acidified solution and crystallizedmother liquid to obtain complex salt and secondary frozen mother liquid; and h, evaporating and concentrating the secondary frozen mother liquid to separate out ammonium sulfate. The method is low inenvironmental pollution and high in raw material utilization rate.

Description

technical field [0001] The invention relates to a method for producing sodium bicarbonate and ammonium sulfate by using sodium sulfate solution, belonging to the technical field of chemical industry. Background technique [0002] Sodium flue gas desulfurization technology using sodium bicarbonate as raw material is a new type of high-efficiency flue gas desulfurization technology, which can directly meet ultra-low emission standards without secondary pollution. The by-product fertilizer of this technology has high economic value, and the device can realize profitable operation. It has better economy than similar technologies, and is of great significance to the smog control of my country, a large coal-burning country. If the replacement and upgrading of my country's flue gas treatment technology is realized and 30% of the lime gypsum desulfurization process market is replaced, the waste liquid produced by the sodium desulfurization technology will contain 11.875 million tons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/02C01C1/244
CPCC01C1/244C01D7/02C01P2006/80
Inventor 党亚固张顺费德君吉旭方艳周利
Owner SICHUAN UNIV
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