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Method for preparing molten salt-grade sodium nitrate through accurately controlled separation of sodium nitrite and sodium chloride

A sodium nitrite, precise control technology, applied in the production and preparation of sodium nitrite, in the field of sodium nitrite, can solve the problems of impurity separation, etc., and achieve the effects of low production cost, pollution elimination, and accurate parameter values

Pending Publication Date: 2019-09-20
青海联大化工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the prior art and improve the production process, the present invention proposes a method for precisely controlling and separating sodium nitrite and sodium chloride to produce molten salt grade sodium nitrate, which solves the problem of impurity separation in the production process of sodium nitrate and provides scientific A rigorous plan to improve the quality of sodium nitrate and sodium nitrite, thereby reducing production costs and reducing material waste

Method used

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  • Method for preparing molten salt-grade sodium nitrate through accurately controlled separation of sodium nitrite and sodium chloride

Examples

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Effect test

Embodiment 1

[0019] Embodiment 1, S01, the separation of sodium nitrite, 1000Kg soda ash and the neutralization solution of nitrogen oxides are concentrated to the concentration of sodium nitrate is 50g / L, under the condition of temperature 10 ℃, crystallization, filtration obtains sodium nitrite Product 210Kg and mother liquor A; the obtained sodium nitrite product has a main content of 98.5 (dry basis), which has reached the first-class and above standards of industrial sodium nitrite;

[0020] S02, the separation of magnesium chloride impurity, S01 obtains mother liquor A and adds 172Kg nitric acid (concentration 40%) conversion, makes remaining sodium nitrite all generate sodium nitrate, and sodium nitrate solution liquid is through 3-6 times concentrated crystallization, when sodium chloride in solution Accumulated to Cl - The concentration of sodium chloride and sodium nitrate is 50g / L. At room temperature, sodium chloride and sodium nitrate reach the co-saturation point, and 45Kg of...

Embodiment 2

[0023] Embodiment 2, S01, the separation of sodium nitrite, 2200Kg soda ash and the neutralization solution of nitrogen oxides are concentrated to the concentration of sodium nitrate is 300g / L, under the condition of temperature 40 ℃, crystallization, filtration obtains sodium nitrite Product 445Kg and mother liquor A; the main content of sodium nitrite product obtained is 99.1% (dry basis), which has reached the first-class and above standards of industrial sodium nitrite;

[0024] S02, the separation of magnesium chloride impurity, S01 obtains mother liquor A and adds 387Kg nitric acid (concentration 40%) conversion, makes remaining sodium nitrite all generate sodium nitrate, and sodium nitrate solution is separated into technical grade sodium nitrate 99Kg and mother liquor through 5 times of concentrated crystallization B, the accumulation of sodium chloride in solution to Cl - The concentration of sodium chloride is 100g / L, and sodium chloride and sodium nitrate reach the ...

Embodiment 3

[0027] Example 3, S01, the separation of sodium nitrite, 3000Kg soda ash and the neutralization solution of nitrogen oxides are concentrated to a concentration of 500g / L of sodium nitrate, and at a temperature of 60°C, crystallize and filter to obtain sodium nitrite The product is 590Kg and mother liquor A; the main content of sodium nitrite product is 99.5% (dry basis), which has reached the first-class and above standard of industrial sodium nitrite;

[0028] S02, the separation of magnesium chloride impurity, S01 obtains mother liquor A and adds 541Kg nitric acid (concentration 40%) conversion, makes remaining sodium nitrite all generate sodium nitrate, and sodium nitrate solution liquid is through 3-6 times concentrated crystallization, when sodium chloride in solution Accumulated to Cl - The concentration of sodium chloride and sodium nitrate is 150g / L. At room temperature, sodium chloride and sodium nitrate reach the co-saturation point, and 135Kg of industrial grade sod...

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Abstract

The invention discloses a method for preparing molten salt-grade sodium nitrate through accurately controlled separation of sodium nitrite and sodium chloride, and relates to the technical field of production and preparation of sodium nitrite and sodium nitrate. The method comprises the following steps: separation of sodium nitrite, separation of magnesium chloride impurities, separation of sodium chloride impurities, and re-crystallization to prepare molten-salt-grade sodium nitrate, thereby finally obtaining the first-grade sodium nitrite and molten salt-grade sodium nitrate. The method has the beneficial effects that the neutralization solution for tail gas treatment of the nitric acid production system is used as a raw material, so that the cost is low, pollution is eliminated, and a product with higher value is obtained; compared with the prior art, the method has the advantages that the sodium nitrite is separated by taking the sodium nitrate concentration in the neutralized concentrated solution as a determination basis, the parameter value is accurate and rigorous, and the quality of the obtained sodium nitrite product is excellent; solution circulation operation is carried out to prepare sodium nitrate, impurities in the solution are thoroughly separated from the product, raw material waste is avoided, and production cost is low. The sodium nitrate product obtained by the method is high in purity and meets the standard of fused salt-grade sodium nitrate products.

Description

technical field [0001] The invention relates to the technical field of production and preparation of sodium nitrite and sodium nitrate, in particular to a method for precisely controlling and separating sodium nitrite and sodium chloride to prepare molten salt grade sodium nitrate. Background technique [0002] The domestic solar energy concentrating power generation industry has emerged in recent years, replacing coal-fired power generation, which belongs to green energy and is strongly supported by the state. The heat storage medium used in solar heat concentration is a mixture of sodium nitrate and potassium nitrate, that is, solar heat storage molten salt, which has high quality requirements and large demand (more than one million tons). The company has the basis for the production of agricultural potassium nitrate and industrial sodium nitrate, so the conditions for developing solar heat storage molten salt are good. On this basis, the development of solar heat storage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D9/00C01D9/16C01B21/50C01F5/24C01D3/04
CPCC01D9/00C01D9/16C01B21/50C01F5/24C01D3/04C01P2006/80
Inventor 余荣华李勇王淑君
Owner 青海联大化工科技有限公司
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