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Sodium nitrate preparation method

A technology of sodium nitrate and nitric acid, applied in directions such as the preparation of alkali metal nitrates, can solve the problems of high output and low cost of preparation, and achieve the effects of market competitiveness and economic benefits, reducing investment and improving economic benefits.

Active Publication Date: 2016-06-01
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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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

Method used

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Embodiment 1

[0049] Such as figure 1 Shown, present embodiment adopts following steps to prepare sodium nitrate:

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

[0051] (2) Add a nitric acid solution with a mass fraction of 44.5% into the neutralization reactor by using a transfer pump, and turn on the stirring device in the neutralization reactor, and continuously stir the reaction solution in the neutralization reactor.

[0052] Afterwards, continue to add the solid-phase sodium bicar...

Embodiment 2

[0056] Present embodiment adopts following steps to prepare sodium nitrate:

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

[0058] (2) Add a nitric acid solution with a mass fraction of 44.5% into the neutralization reactor by using a transfer pump, and turn on the stirring device in the neutralization reactor to continuously stir the reaction solution in the neutralization reactor.

[0059] After that, continue to add solid-phase sodium bicarbonate to the neutralization re...

Embodiment 3

[0064] Produce sodium nitrate according to the step in above-mentioned embodiment two, but the pH value fine-tuning method of step (3) is slightly different with embodiment two, specifically: (a) at first detect whether there is CO in the neutralization reactor 2 Significant overflow; (b) in the absence of CO 2 In the case of obviously overflowing, add nitric acid in 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 value 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 Gas is emitted until the pH value of the reaction solution is 6, and the addition is stopped, indicating that the reaction ends and reaches the end of the reaction.

[0065] The sodium nitrate finished product that present embodiment obtains is measured by the national standard test...

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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 preparation method of sodium nitrate, in particular to a preparation method of industrial high-grade sodium nitrate. Background technique [0002] Sodium nitrate can be used as a decolorizing agent for molten caustic soda in the inorganic industry or used to make other nitrates. It can be used as a coloring agent for meat processing in the food industry, which can prevent meat from going bad and play a role in seasoning. In addition, it has a wide range of applications in the enamel industry, glass industry, chemical fertilizer industry, dye industry, metallurgical industry, machinery industry, pharmaceutical industry, etc., so the demand for sodium nitrate in many fields is very large . [0003] The preparation methods of traditional sodium nitrate generally include natural Chilean saltpeter preparation method, double decomposition method, conversion method, absorption method and middle method, and these five kinds of prepa...

Claims

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Application Information

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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 ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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