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A kind of method utilizing sodium sulfate and sodium chloride mixed salt to prepare sodium carbonate, ammonium sulfate and ammonium chloride

A technology of sodium chloride and sodium sulfate, applied in the field of chemical technology, can solve the problems of large investment in equipment, unfavorable large-scale popularization and application, poor quality, etc., and achieves remarkable environmental benefits, high-value utilization, low energy consumption and low cost. Effect

Active Publication Date: 2022-03-04
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of inorganic salt separation, this method has the problems of large material circulation, large equipment investment, high energy consumption, and incomplete salt separation. The products sodium sulfate and sodium chloride are of poor quality and low value, which cannot be effectively deducted. Production costs increase the overall operating costs of high-salt wastewater, which is not conducive to large-scale application
[0004] In addition, because sodium chloride belongs to the upstream raw material of the inorganic industry, it is mainly used in the chlor-alkali industry, but because of its poor quality and lack of relevant quality standard support, its recognition is low, and the market consumption space is limited. Lord, the environmental threat is serious

Method used

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  • A kind of method utilizing sodium sulfate and sodium chloride mixed salt to prepare sodium carbonate, ammonium sulfate and ammonium chloride

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Present embodiment provides a kind of method utilizing sodium sulfate and sodium chloride mixed salt to prepare sodium carbonate, ammonium sulfate and ammonium chloride, as figure 1As shown, the method includes the following steps:

[0040] (1) Mix sodium sulfate and sodium chloride mixed salt, cooling crystallization mother liquor, and ammonium bicarbonate solid, carry out double decomposition reaction at 35°C, and obtain sodium bicarbonate and sodium bicarbonate mother liquor after filtration and separation, and the sodium bicarbonate is roasted Obtain sodium carbonate afterward; The ratio of the molar weight of sodium in the sodium sulfate and sodium chloride mixed salt and the molar weight of nitrogen in the ammonium bicarbonate solid is Na:N=1.2:1;

[0041] (2) Mix the deammonization solid and the sodium bicarbonate mother liquor obtained in step (1), carry out near-room temperature crystallization at 35°C, and obtain double salt and near-room temperature crystalli...

Embodiment 2

[0047] Present embodiment provides a kind of method utilizing sodium sulfate and sodium chloride mixed salt to prepare sodium carbonate, ammonium sulfate and ammonium chloride, as figure 1 As shown, the method includes the following steps:

[0048] (1) Mix sodium sulfate and sodium chloride mixed salt, cooling crystallization mother liquor, ammonia gas and carbon dioxide gas mixture, carry out metathesis reaction at 50°C, and obtain sodium bicarbonate and sodium bicarbonate mother liquor after centrifugal separation. Sodium obtains sodium carbonate after roasting; The ratio of the molar weight of sodium in the sodium sulfate and sodium chloride mixed salt and the molar weight of nitrogen in the mixed gas of ammonia and carbon dioxide is Na:N=0.8:1, and the The molar ratio of ammonia to carbon dioxide in the mixture of ammonia and carbon dioxide is 1:1;

[0049] (2) Mix the deammonization solid and the sodium bicarbonate mother liquor obtained in step (1), conduct near-room te...

Embodiment 3

[0055] Present embodiment provides a kind of method utilizing sodium sulfate and sodium chloride mixed salt to prepare sodium carbonate, ammonium sulfate and ammonium chloride, as figure 1 As shown, the method includes the following steps:

[0056] (1) Mix sodium sulfate and sodium chloride mixed salt, cooling crystallization mother liquor, ammonia gas and carbon dioxide gas mixture, carry out metathesis reaction at 20°C, obtain sodium bicarbonate and sodium bicarbonate mother liquor after filtration and separation, and the hydrogen carbonate Sodium obtains sodium carbonate after roasting; The ratio of the molar weight of sodium in the sodium sulfate and sodium chloride mixed salt and the molar weight of nitrogen in the mixed gas of ammonia and carbon dioxide is Na:N=1.5:1, and the The molar ratio of ammonia to carbon dioxide in the mixture of ammonia and carbon dioxide is 0.8:1;

[0057] (2) Mix the deammonization solid and the sodium bicarbonate mother liquor obtained in st...

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Abstract

The invention provides a method for preparing sodium carbonate, ammonium sulfate and ammonium chloride by using mixed salt of sodium sulfate and sodium chloride, specifically: (1) mixing mixed salt, cooling crystallization mother liquor, ammonium bicarbonate solid or ammonia gas and carbon dioxide mixed gas, carry out metathesis reaction to obtain sodium bicarbonate and sodium bicarbonate mother liquor, and the sodium bicarbonate is roasted to obtain sodium carbonate; (2) mix the deammonium solid and the sodium bicarbonate mother liquor obtained in step (1), and perform near Normal temperature crystallization to obtain double salt and near normal temperature crystallization mother liquor; (3) cooling and crystallization of near normal temperature crystallization mother liquor obtained in step (2) to obtain ammonium chloride and cooling crystallization mother liquor; (4) mixing ammonium sulfate mother liquor and step (2) The obtained double salt is enriched with ammonium sulfate to obtain ammonium sulfate solution and deammonized solid; (5) evaporating and crystallizing the ammonium sulfate solution obtained in step (4) to obtain ammonium sulfate and ammonium sulfate mother liquor. The method realizes high-value utilization on the premise that sodium sulfate and sodium chloride do not distinguish between salts.

Description

technical field [0001] The invention belongs to the technical field of chemical technology, and relates to a method for utilizing mixed salt of sodium sulfate and sodium chloride, in particular to a method for preparing sodium carbonate, ammonium sulfate and ammonium chloride by using mixed salt of sodium sulfate and sodium chloride. Background technique [0002] Sodium sulfate and sodium chloride are similar in nature, both belong to neutral salts, and often coexist with each other in nature. At the same time, my country's industrial production process requires a lot of acid and alkali. The alkali is mainly sodium carbonate or sodium hydroxide, the acid is mainly sulfuric acid or hydrochloric acid, and the salt produced after acid-base neutralization is mainly sodium sulfate or sodium chloride. When the industry uses sodium sulfate or sodium chloride as the basic raw material to prepare high value-added products such as soda ash, it is first necessary to separate the two, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/16C01D7/12C01D7/02C01C1/244C01C1/24
CPCC01C1/164C01D7/12C01D7/02C01C1/244C01C1/24C01P2006/80
Inventor 张洋范兵强张贺东申长帅郑诗礼曹宏斌陈沛松
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI