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Methods for coproducing sodium carbonate and ammonium sulfate from melamine tail gas and mirabilite

A technology of ammonium sulfate and soda ash, applied in the direction of ammonium sulfate and carbonate preparations, etc., can solve the problem that melamine tail gas cannot be fully utilized as waste heat and steam, and achieve the expansion of large-scale utilization methods, obvious energy saving and consumption reduction, and economic benefits. Good results

Inactive Publication Date: 2011-09-28
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0014] The second technical problem to be solved by the present invention is that the treatment of melamine tail gas in the prior art cannot make full use of a large amount of waste heat steam in the melamine preparation process, and then provide a kind of waste heat steam that can make full use of the above-mentioned Soda ash and / or ammonium sulfate process from melamine

Method used

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  • Methods for coproducing sodium carbonate and ammonium sulfate from melamine tail gas and mirabilite
  • Methods for coproducing sodium carbonate and ammonium sulfate from melamine tail gas and mirabilite
  • Methods for coproducing sodium carbonate and ammonium sulfate from melamine tail gas and mirabilite

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Embodiment 1

[0143] refer to figure 1 , Embodiment 1 of the present invention will be described in detail.

[0144] Join Na 2 CO 3 and NaOH, the crude Glauber's salt aqueous solution is refined by the two-alkali method, and the above-mentioned crude Glauber's salt aqueous solution is treated so that the total concentration of calcium and magnesium ions is lower than 10ppm and Na 2 SO 4 A refined sodium sulfate aqueous solution with a content of 29 wt%.

[0145] With the above Na 2 SO 4 The 29wt% refined sodium sulfate aqueous solution absorbs the tail gas of the melamine process, the temperature is controlled at 42-45°C to ensure the complete absorption of the melamine tail gas, and the amount of the refined sodium sulfate aqueous solution is adjusted to make an ammonium carbonate-sodium sulfate aqueous solution containing 9.5% ammonia . Continue to feed CO into the ammonium carbonate-sodium sulfate aqueous solution 2 Gas, control the reaction temperature to be 65°C, so that the a...

Embodiment 2

[0153] Embodiment 2 is carried out according to the conditions shown in table 1, Na 2 SO 4 The filter cake is returned to the alkali-making process as a raw material, and other steps and conditions are the same as in Example 1.

Embodiment 3

[0155] Embodiment 3 is carried out according to the conditions shown in table 1, Na 2 SO 4 The filter cake is returned to the alkali-making process as a raw material, and other steps and conditions are the same as in Example 1.

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Abstract

The invention relates to methods for coproducing sodium carbonate and ammonium sulfate from melamine tail gas and mirabilite. The method for producing the sodium carbonate comprises the following steps of: a, providing a sodium sulfate water solution; b, introducing melamine tail gas into the sodium sulfate water solution to form an ammonium carbonate-sodium sulfate water solution; c, introducing carbon dioxide into the ammonium carbonate-sodium sulfate water solution to obtain a suspension serous fluid of sodium bicarbonate crystals; and d, carrying out solid and liquid separation on the suspension serous fluid to obtain sodium bicarbonate and a mother solution I, calcining sodium bicarbonate solid to obtain the sodium carbonate. The method further comprises the following steps of: e, adding the mother solution I into an ammonia stilling tower, heating, forming tower top mixed gas containing ammonia and carbon dioxide, generating a deamination solution in the tower; f, evaporating the deamination solution for dewatering to obtain sodium sulfate crystals and a mother solution II; g, cooling the mother solution II for crystallizing to obtain Na2SO4.(NH4)2SO4.4H2O salt crystals and a mother solution III; and h, evaporating the mother solution III for dewatering, and separating out ammonium sulfate crystals. The methods have the advantages of high utilization rate of raw materials and low energy consumption.

Description

technical field [0001] The invention relates to a method for producing soda ash and / or ammonium sulfate, in particular to a method for jointly producing soda ash and ammonium sulfate with melamine tail gas and Glauber's salt. Background technique [0002] Melamine ((NH 2 ) 3 C 3 N 3 ), also known as melamine, is a widely used organic chemical raw material. It can be used to make melamine-formaldehyde resin (melamine plastic), make daily utensils, decorative veneers, fabric finishing agents, etc. It can also be used as a paper treatment agent in combination with ether, and can also be used as a coating crosslinking agent and flame retardant Chemical treatment agents, etc. The most original melamine production method is the dicyandiamide method. After the 1980s, the industrial production of melamine began to use urea as a raw material, and the following reactions were carried out under a certain temperature and a certain pressure: [0003] 6(NH 2 ) 2 CO→C 3 h 6 N 6 ...

Claims

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Application Information

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IPC IPC(8): C01D7/18C01C1/24
Inventor 雷林唐印刘朝慧吴本勇陈刚李旭初易江林陈端阳尹明大李刚
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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