Method for simultaneously preparing potassium nitrate and calcium chloride from calcium nitrate solution and potassium chloride

A technology of potassium chloride and calcium nitrate, applied in the preparation of alkali metal nitrate, calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problems of low product yield and low purity of by-products, etc. Achieve the effect of high product purity, improved separation effect and high yield

Active Publication Date: 2015-03-25
JIAOCHENG KNLAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low product yield and low purity of by-products in the existing double decomposition preparation process

Method used

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  • Method for simultaneously preparing potassium nitrate and calcium chloride from calcium nitrate solution and potassium chloride
  • Method for simultaneously preparing potassium nitrate and calcium chloride from calcium nitrate solution and potassium chloride

Examples

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Example Embodiment

[0017] Example 1

[0018] Prepare 1640g of 30% calcium nitrate solution and add it to a stainless steel reactor with coil heating and jacket cooling. Then add 447g of potassium chloride solid to the calcium nitrate solution and heat it until all the potassium chloride solids are dissolved. The mixed solution is concentrated. When the surface of the mixed solution just appears crystallization, that is, when it reaches saturation, the heating is stopped. The temperature of the material is controlled by the jacket cooling water. When the temperature drops to 58°C, 223.5g of methanol (equivalent to 50% of the mass of potassium chloride), continue to lower the temperature and crystallize under stirring conditions, and continue stirring for 60 minutes to ensure that the potassium nitrate crystals are fully analyzed. When the temperature drops to 25°C, all the crystalline materials are precipitated, and the solids are separated by suction filtration. Wash the solid with potassium nitrat...

Example Embodiment

[0020] Example 2

[0021] Prepare 1640g of 30% calcium nitrate solution and add it to a stainless steel reactor with coil heating and jacket cooling. Then add 447g of potassium chloride solid to the calcium nitrate solution and heat it until all the potassium chloride solids are dissolved. The mixed solution is concentrated. When the surface of the mixed solution just appears crystallization, that is, when it reaches saturation, the heating is stopped. The temperature of the material is controlled by the jacket cooling water. When the temperature drops to 50°C, 330g of methanol (equivalent to chlorine) is added to the reactor. 74% of the mass of potassium chloride), continue to lower the temperature and crystallize under stirring conditions, continue to stir for 180 minutes to ensure that the potassium nitrate crystals are fully analyzed, control the temperature through the refrigeration system and when the temperature drops to -20°C, all the crystalline materials are precipitated...

Example Embodiment

[0022] Example 3

[0023] Prepare 1640g of 30% calcium nitrate solution and add it to a stainless steel reactor with coil heating and jacket cooling. Then add 447g of potassium chloride solid to the calcium nitrate solution and heat it until all the potassium chloride solids are dissolved. The mixed solution is concentrated. When the surface of the mixed solution just appears crystallization, that is, when it reaches saturation, the heating is stopped. The temperature of the material is controlled by the jacket cooling water. When the temperature drops to 50°C, 223.5g of methanol (equivalent to 50% of the mass of potassium chloride), continue to lower the temperature and crystallize under stirring conditions, continue to stir for 30 minutes to ensure that the potassium nitrate crystals are fully analyzed, and control the temperature through the refrigeration system and when the temperature drops to -10°C, all the crystalline materials will be precipitated and the solid Separate b...

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Abstract

The invention relates to a method for simultaneously preparing potassium nitrate and calcium chloride from a calcium nitrate solution and potassium chloride. According to the method, the problems that the product yield is low and the purities of side products are low in an existing preparation process are solved. According to the main principle of the method, alcohol solvents are added in a cooling crystallization process of potassium nitrate according to the characteristic that a stable complex can be generated by calcium chloride and the alcohol solvents, so that calcium chloride cannot be separated out in a solid form; meanwhile, by adding the alcohol solvents, the solubility of potassium nitrate in the solution is reduced, so that the number of crystals of potassium nitrate can be substantially increased, and the yield of potassium nitrate is increased. The method has the beneficial effects that the cost of raw materials is low; by introducing the organic alcohol solvents, the separation effect between potassium nitrate and calcium chloride is remarkably improved; compared with a traditional double decomposition process, the purity of the obtained product is relatively high, and the yield is high; by virtue of closed circulation of the alcohol solvents, the environmental pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of producing inorganic salts, in particular to a method for preparing potassium nitrate by using calcium nitrate solution and potassium chloride and producing calcium chloride by-product. Background technique [0002] Potassium nitrate is an important industrial raw material and an important chlorine-free nitrogen potassium compound fertilizer, which can be called the best potash fertilizer. Potassium nitrate is not only high in potassium content (44% pure), but also a compound fertilizer of nitrogen and potassium. It has good water solubility, low acidity, and is easy for plants to absorb. It is suitable for any crops and any season. So far, more than 60 countries have promoted the use of agricultural potassium nitrate. There are many process routes for preparing potassium nitrate, but the ion exchange process and the double decomposition process using ammonium nitrate and potassium chloride as raw materia...

Claims

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Application Information

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IPC IPC(8): C01D9/12C01F11/24
CPCC01D9/12C01F11/24C01P2006/80
Inventor 蔺向前张铁忠赵国斌蔺向光魏彦红赵和平宋晓明
Owner JIAOCHENG KNLAN CHEM
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