A kind of preparation method of sodium nitrate

A technology of sodium nitrate and nitric acid, which is applied in the preparation of alkali metal nitrates, etc., can solve the problems of low cost and high output, and achieve the effects of reduced investment, significant market competitiveness and economic benefits, and reduced production costs

Active Publication Date: 2017-11-21
QINGHAI SALT LAKE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The object of the present invention is to provide a kind of preparation method of sodium nitrate, all there is respective defect in the preparation method for solving existing sodium nitrate, thereby can't prepare high yield, high purity with lower cost and more convenient mode The Sodium Nitrate Problem

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  • A kind of preparation method of sodium nitrate
  • A kind of preparation method of sodium nitrate

Examples

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Embodiment 1

[0049] Such as figure 1 As shown, this embodiment adopts the following steps to prepare sodium nitrate:

[0050] (1) The raw material sodium bicarbonate is pulped and washed with industrial water, and the adding amount of industrial water is added according to the mass ratio of raw material sodium bicarbonate to industrial water of 0.58:1. The washing slurry is filtered, and the liquid phase is the washing waste liquid, which can be transported to the carbonization process of preparing soda ash by the ammonia-soda method. Sodium chloride is dissolved as the raw material of the carbonization process; the solid phase is dried to obtain purified sodium bicarbonate.

[0051] (2) A transfer pump is used to add a 44.5% nitric acid solution with a mass fraction of the neutralization reactor, and the stirring device in the neutralization reactor is turned on to continuously stir the reaction liquid in the neutralization reactor.

[0052] After that, the solid phase sodium bicarbonate in ste...

Embodiment 2

[0056] In this example, the following steps were used to prepare sodium nitrate:

[0057] (1) The raw material sodium bicarbonate is pulped and washed with industrial water, and the adding amount of industrial water is added according to the mass ratio of raw material sodium bicarbonate to industrial water of 0.58:1. The washing slurry is filtered, and the liquid phase is the washing waste liquid, which can be transported to the carbonization process of preparing soda ash by the ammonia-soda method. Sodium chloride is dissolved as the raw material of the carbonization process; the solid phase is dried to obtain purified sodium bicarbonate.

[0058] (2) A transfer pump is used to add a 44.5% nitric acid solution with a mass fraction to the neutralization reactor, and the stirring device in the neutralization reactor is turned on to continuously stir the reaction liquid in the neutralization reactor.

[0059] After that, the solid-phase sodium bicarbonate is continuously added to the n...

Embodiment 3

[0064] Sodium nitrate is produced according to the steps in the second embodiment above, but the pH value fine-tuning method in step (3) is slightly different from that in the second embodiment, specifically: (a) first detect whether there is CO in the neutralization reactor 2 Obvious overflow; (b) Without CO 2 In the case of obvious overflow, add nitric acid to the neutralization reactor. The volume of nitric acid added is 0.6% of the volume of nitric acid in the original neutralization reactor, so that the pH of the reaction solution in the neutralization reactor is 5; (c) Continue to add sodium carbonate to the neutralization reactor, during which there will be a small amount of CO 2 The gas is released until the pH value of the reaction solution is 6, and the addition is stopped, indicating that the reaction is over and the reaction end is reached.

[0065] The finished sodium nitrate obtained in this example was measured according to the national standard test method for sodiu...

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Abstract

The invention discloses a sodium nitrate preparation method which specifically comprises the following steps: (1) by taking sodium bicarbonate and nitric acid as raw materials, washing the raw material sodium bicarbonate with a cleaning liquid, and performing solid-liquid separation so as to obtain solid phase sodium bicarbonate and a liquid phase waste washing liquid; (2) mixing the solid phase sodium bicarbonate and the raw material nitric acid, and performing solid-liquid neutralization reaction so as to obtain a reaction mixture after the reaction is completed; (3) treating the reaction mixture obtained in the step (2) by using a concentration method, thereby obtaining a final product sodium nitrate. By adoption of the sodium nitrate preparation method disclosed by the invention, sodium nitrate of a superior grade can be prepared, or even sodium nitrate of a food additive grade can be produced, and moreover the sodium nitrate preparation method disclosed by the invention is environment-friendly and energy-saving, and remarkable in economic benefit.

Description

Technical field [0001] The invention relates to a method for preparing sodium nitrate, in particular to a method for preparing industrial superior grade sodium nitrate. Background technique [0002] Sodium nitrate can be used as a decolorizing agent for molten caustic soda in the inorganic industry or in the manufacture of other nitrates. In the food industry, it can be used as a coloring agent for meat processing. It can prevent meat from deteriorating and can be used for flavoring. In addition, it has a wide range of applications in the enamel industry, glass industry, fertilizer industry, dye industry, metallurgical industry, machinery industry, and pharmaceutical industry. Therefore, the demand for sodium nitrate in many fields is very large. . [0003] Traditional sodium nitrate preparation methods generally include natural Chile saltpeter preparation method, double decomposition method, conversion method, absorption method and neutralization method. These five preparation me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/08
CPCC01D9/08C01P2006/80
Inventor 李生廷王石军侯元昇屈小荣郑有为赵玮马占梅张发莲张延芳刘喜业冶巧萍沈莉周洋
Owner QINGHAI SALT LAKE IND
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